diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f5958d2fd1..a40b9f7074 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -76,8 +76,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - elixir: '1.12.0'
-            otp: '24.0'
           - elixir: '1.13.0'
             otp: '24.1'
           - elixir: '1.14.0'
diff --git a/README.md b/README.md
index 7cbc883f7b..958c2d7b66 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 ## Setup
 
-The exercises currently target Elixir versions from 1.12 to 1.17 and Erlang/OTP versions from 24 to 27. Detailed installation instructions can be found at
+The exercises currently target Elixir versions from 1.13 to 1.17 and Erlang/OTP versions from 24 to 27. Detailed installation instructions can be found at
 [https://elixir-lang.org/install.html](https://elixir-lang.org/install.html). We recommend using the [asdf version manager](https://github.com/asdf-vm/asdf) to manage multiple Elixir versions.
 
 ## Testing
diff --git a/bin/bootstrap_practice_exercise.exs b/bin/bootstrap_practice_exercise.exs
index 7c1bacd386..94cc5d4bc8 100644
--- a/bin/bootstrap_practice_exercise.exs
+++ b/bin/bootstrap_practice_exercise.exs
@@ -167,7 +167,6 @@ defmodule #{module}.MixProject do
     [
       app: :#{exercise_snake_case},
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/bin/fetch-configlet b/bin/fetch-configlet
index 4800e15084..6bef43ab72 100755
--- a/bin/fetch-configlet
+++ b/bin/fetch-configlet
@@ -24,10 +24,11 @@ get_download_url() {
   local latest='https://api.github.com/repos/exercism/configlet/releases/latest'
   local arch
   case "$(uname -m)" in
-    x86_64) arch='x86-64' ;;
-    *686*)  arch='i386'   ;;
-    *386*)  arch='i386'   ;;
-    *)      arch='x86-64' ;;
+    aarch64|arm64) arch='arm64'  ;;
+    x86_64)        arch='x86-64' ;;
+    *686*)         arch='i386'   ;;
+    *386*)         arch='i386'   ;;
+    *)             arch='x86-64' ;;
   esac
   local suffix="${os}_${arch}.${ext}"
   curl "${curlopts[@]}" --header 'Accept: application/vnd.github.v3+json' "${latest}" |
@@ -47,7 +48,7 @@ main() {
   fi
 
   local os
-  case "$(uname)" in
+  case "$(uname -s)" in
     Darwin*)   os='macos'   ;;
     Linux*)    os='linux'   ;;
     Windows*)  os='windows' ;;
@@ -58,8 +59,8 @@ main() {
 
   local ext
   case "${os}" in
-    windows*) ext='zip'    ;;
-    *)        ext='tar.gz' ;;
+    windows) ext='zip'    ;;
+    *)       ext='tar.gz' ;;
   esac
 
   echo "Fetching configlet..." >&2
@@ -69,16 +70,16 @@ main() {
   curl "${curlopts[@]}" --output "${output_path}" "${download_url}"
 
   case "${ext}" in
-    *zip) unzip "${output_path}" -d "${output_dir}"   ;;
-    *)    tar xzf "${output_path}" -C "${output_dir}" ;;
+    zip) unzip "${output_path}" -d "${output_dir}"   ;;
+    *)   tar xzf "${output_path}" -C "${output_dir}" ;;
   esac
 
   rm -f "${output_path}"
 
   local executable_ext
   case "${os}" in
-    windows*) executable_ext='.exe' ;;
-    *)        executable_ext=''     ;;
+    windows) executable_ext='.exe' ;;
+    *)       executable_ext=''     ;;
   esac
 
   local configlet_path="${output_dir}/configlet${executable_ext}"
diff --git a/exercises/concept/basketball-website/.meta/config.json b/exercises/concept/basketball-website/.meta/config.json
index ec5f0898ef..fb778be189 100644
--- a/exercises/concept/basketball-website/.meta/config.json
+++ b/exercises/concept/basketball-website/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about Access Behaviour by helping extract deeply nested data for the basketball team's website."
 }
diff --git a/exercises/concept/basketball-website/mix.exs b/exercises/concept/basketball-website/mix.exs
index e653239537..a80a337a2f 100644
--- a/exercises/concept/basketball-website/mix.exs
+++ b/exercises/concept/basketball-website/mix.exs
@@ -5,7 +5,6 @@ defmodule BasketballWebsite.MixProject do
     [
       app: :basketball_website,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/bird-count/.meta/config.json b/exercises/concept/bird-count/.meta/config.json
index 92f6ab9c1a..516506c625 100644
--- a/exercises/concept/bird-count/.meta/config.json
+++ b/exercises/concept/bird-count/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/bird-watcher"
   ],
diff --git a/exercises/concept/bird-count/mix.exs b/exercises/concept/bird-count/mix.exs
index 45a0416247..317cfda52f 100644
--- a/exercises/concept/bird-count/mix.exs
+++ b/exercises/concept/bird-count/mix.exs
@@ -5,7 +5,6 @@ defmodule BirdCount.MixProject do
     [
       app: :bird_count,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/boutique-inventory/.meta/config.json b/exercises/concept/boutique-inventory/.meta/config.json
index 744fe2532e..8196e2bf7f 100644
--- a/exercises/concept/boutique-inventory/.meta/config.json
+++ b/exercises/concept/boutique-inventory/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about the Enum module by preparing your fashion boutique for the big annual sale."
 }
diff --git a/exercises/concept/boutique-inventory/mix.exs b/exercises/concept/boutique-inventory/mix.exs
index 86e51d0904..4528d07b6b 100644
--- a/exercises/concept/boutique-inventory/mix.exs
+++ b/exercises/concept/boutique-inventory/mix.exs
@@ -5,7 +5,6 @@ defmodule BoutiqueInventory.MixProject do
     [
       app: :boutique_inventory,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/boutique-suggestions/.meta/config.json b/exercises/concept/boutique-suggestions/.meta/config.json
index 34bcc79cda..a385752a3f 100644
--- a/exercises/concept/boutique-suggestions/.meta/config.json
+++ b/exercises/concept/boutique-suggestions/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about list comprehensions by generating outfit suggestions for the clients of your fashion boutique."
 }
diff --git a/exercises/concept/boutique-suggestions/mix.exs b/exercises/concept/boutique-suggestions/mix.exs
index 7ae91f1d06..268457877d 100644
--- a/exercises/concept/boutique-suggestions/mix.exs
+++ b/exercises/concept/boutique-suggestions/mix.exs
@@ -5,7 +5,6 @@ defmodule BoutiqueSuggestions.MixProject do
     [
       app: :boutique_suggestions,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/bread-and-potions/.meta/config.json b/exercises/concept/bread-and-potions/.meta/config.json
index 57ee8291e1..cdbf8350ce 100644
--- a/exercises/concept/bread-and-potions/.meta/config.json
+++ b/exercises/concept/bread-and-potions/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about protocols by developing your own role-playing video game."
 }
diff --git a/exercises/concept/bread-and-potions/mix.exs b/exercises/concept/bread-and-potions/mix.exs
index c8fb4bbc79..7c5ee95599 100644
--- a/exercises/concept/bread-and-potions/mix.exs
+++ b/exercises/concept/bread-and-potions/mix.exs
@@ -5,7 +5,6 @@ defmodule RPG.MixProject do
     [
       app: :bread_and_potions,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/captains-log/.meta/config.json b/exercises/concept/captains-log/.meta/config.json
index ac9a502097..02eca9bfb9 100644
--- a/exercises/concept/captains-log/.meta/config.json
+++ b/exercises/concept/captains-log/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about randomness and using Erlang libraries from Elixir by helping Mary generate stardates and starship registry numbers for her Star Trek themed pen-and-paper role playing sessions."
 }
diff --git a/exercises/concept/captains-log/mix.exs b/exercises/concept/captains-log/mix.exs
index dd2a693c4d..1fb610fabb 100644
--- a/exercises/concept/captains-log/mix.exs
+++ b/exercises/concept/captains-log/mix.exs
@@ -5,7 +5,6 @@ defmodule CaptainsLog.MixProject do
     [
       app: :captains_log,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/chessboard/.meta/config.json b/exercises/concept/chessboard/.meta/config.json
index 75e1bae89f..0ba8f36b25 100644
--- a/exercises/concept/chessboard/.meta/config.json
+++ b/exercises/concept/chessboard/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about ranges by generating a chessboard."
 }
diff --git a/exercises/concept/chessboard/mix.exs b/exercises/concept/chessboard/mix.exs
index e790271550..3d433e07d8 100644
--- a/exercises/concept/chessboard/mix.exs
+++ b/exercises/concept/chessboard/mix.exs
@@ -5,7 +5,6 @@ defmodule Chessboard.MixProject do
     [
       app: :chessboard,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/city-office/.meta/config.json b/exercises/concept/city-office/.meta/config.json
index eb609d4fa8..2e37e32792 100644
--- a/exercises/concept/city-office/.meta/config.json
+++ b/exercises/concept/city-office/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about writing documentation and typespecs by getting your code ready for the arrival of a new colleague at the city office."
 }
diff --git a/exercises/concept/city-office/mix.exs b/exercises/concept/city-office/mix.exs
index 9e8d8280cc..c3056e3113 100644
--- a/exercises/concept/city-office/mix.exs
+++ b/exercises/concept/city-office/mix.exs
@@ -5,7 +5,6 @@ defmodule Form.MixProject do
     [
       app: :city_office,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/community-garden/.meta/config.json b/exercises/concept/community-garden/.meta/config.json
index e8bbe5ef12..7d4a55f09d 100644
--- a/exercises/concept/community-garden/.meta/config.json
+++ b/exercises/concept/community-garden/.meta/config.json
@@ -20,6 +20,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about the Agent module by helping your local community handle community garden registrations."
 }
diff --git a/exercises/concept/community-garden/mix.exs b/exercises/concept/community-garden/mix.exs
index 9577ef2acb..a3c65198db 100644
--- a/exercises/concept/community-garden/mix.exs
+++ b/exercises/concept/community-garden/mix.exs
@@ -5,7 +5,6 @@ defmodule CommunityGarden.MixProject do
     [
       app: :community_garden,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/dancing-dots/.meta/config.json b/exercises/concept/dancing-dots/.meta/config.json
index a46670b62d..7177ac3916 100644
--- a/exercises/concept/dancing-dots/.meta/config.json
+++ b/exercises/concept/dancing-dots/.meta/config.json
@@ -20,6 +20,5 @@
       "lib/dancing_dots/dot_group.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about behaviours by writing animations for dot-based generative art."
 }
diff --git a/exercises/concept/dancing-dots/mix.exs b/exercises/concept/dancing-dots/mix.exs
index 714514ea06..cb1cb3e22d 100644
--- a/exercises/concept/dancing-dots/mix.exs
+++ b/exercises/concept/dancing-dots/mix.exs
@@ -5,7 +5,6 @@ defmodule DancingDots.MixProject do
     [
       app: :dancing_dots,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/date-parser/.meta/config.json b/exercises/concept/date-parser/.meta/config.json
index be98356adc..2af9853878 100644
--- a/exercises/concept/date-parser/.meta/config.json
+++ b/exercises/concept/date-parser/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about regular expressions by parsing dates."
 }
diff --git a/exercises/concept/date-parser/mix.exs b/exercises/concept/date-parser/mix.exs
index a1c27479c8..2ce0f9052d 100644
--- a/exercises/concept/date-parser/mix.exs
+++ b/exercises/concept/date-parser/mix.exs
@@ -5,7 +5,6 @@ defmodule DateParser.MixProject do
     [
       app: :date_parser,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/dna-encoding/.meta/config.json b/exercises/concept/dna-encoding/.meta/config.json
index c5039fb8ef..8d528e7d79 100644
--- a/exercises/concept/dna-encoding/.meta/config.json
+++ b/exercises/concept/dna-encoding/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about bitstrings and tail call recursion by encoding DNA sequences as binary data."
 }
diff --git a/exercises/concept/dna-encoding/mix.exs b/exercises/concept/dna-encoding/mix.exs
index b3224461ec..85fe8dcfd4 100644
--- a/exercises/concept/dna-encoding/mix.exs
+++ b/exercises/concept/dna-encoding/mix.exs
@@ -5,7 +5,6 @@ defmodule DNA.MixProject do
     [
       app: :dna,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/file-sniffer/.meta/config.json b/exercises/concept/file-sniffer/.meta/config.json
index 768cc2f221..b005d18971 100644
--- a/exercises/concept/file-sniffer/.meta/config.json
+++ b/exercises/concept/file-sniffer/.meta/config.json
@@ -17,6 +17,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about binaries by verifying the mime type of files uploaded to your server."
 }
diff --git a/exercises/concept/file-sniffer/mix.exs b/exercises/concept/file-sniffer/mix.exs
index 54d2aa30bf..7163699390 100644
--- a/exercises/concept/file-sniffer/mix.exs
+++ b/exercises/concept/file-sniffer/mix.exs
@@ -5,7 +5,6 @@ defmodule FileSniffer.MixProject do
     [
       app: :file_sniffer,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/freelancer-rates/.meta/config.json b/exercises/concept/freelancer-rates/.meta/config.json
index 541b4f4698..ecb55d0408 100644
--- a/exercises/concept/freelancer-rates/.meta/config.json
+++ b/exercises/concept/freelancer-rates/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "javascript/freelancer-rates"
   ],
diff --git a/exercises/concept/freelancer-rates/mix.exs b/exercises/concept/freelancer-rates/mix.exs
index 830f405b77..b5c4dd3678 100644
--- a/exercises/concept/freelancer-rates/mix.exs
+++ b/exercises/concept/freelancer-rates/mix.exs
@@ -5,7 +5,6 @@ defmodule FreelancerRates.MixProject do
     [
       app: :freelancer_rates,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/german-sysadmin/.meta/config.json b/exercises/concept/german-sysadmin/.meta/config.json
index 409c84283c..61c4d7aecc 100644
--- a/exercises/concept/german-sysadmin/.meta/config.json
+++ b/exercises/concept/german-sysadmin/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about charlists and the case conditional expression by sanitizing usernames of employees in a German company."
 }
diff --git a/exercises/concept/german-sysadmin/mix.exs b/exercises/concept/german-sysadmin/mix.exs
index 5136c70fd1..0c3725e565 100644
--- a/exercises/concept/german-sysadmin/mix.exs
+++ b/exercises/concept/german-sysadmin/mix.exs
@@ -5,7 +5,6 @@ defmodule Username.MixProject do
     [
       app: :german_sysadmin,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/guessing-game/.meta/config.json b/exercises/concept/guessing-game/.meta/config.json
index a76dc72f90..dc70f034b6 100644
--- a/exercises/concept/guessing-game/.meta/config.json
+++ b/exercises/concept/guessing-game/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "fsharp/guessing-game"
   ],
diff --git a/exercises/concept/guessing-game/mix.exs b/exercises/concept/guessing-game/mix.exs
index 6911be3658..c671e2683f 100644
--- a/exercises/concept/guessing-game/mix.exs
+++ b/exercises/concept/guessing-game/mix.exs
@@ -5,7 +5,6 @@ defmodule GuessingGame.MixProject do
     [
       app: :guessing_game,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/high-school-sweetheart/.meta/config.json b/exercises/concept/high-school-sweetheart/.meta/config.json
index 7d6cde7b22..deb2a1c355 100644
--- a/exercises/concept/high-school-sweetheart/.meta/config.json
+++ b/exercises/concept/high-school-sweetheart/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "high-school-sweethearts",
   "blurb": "Learn about strings and the pipe operator by helping high school sweethearts profess their love on social media via ASCII art."
 }
diff --git a/exercises/concept/high-school-sweetheart/mix.exs b/exercises/concept/high-school-sweetheart/mix.exs
index 1282d5d479..c6143d302e 100644
--- a/exercises/concept/high-school-sweetheart/mix.exs
+++ b/exercises/concept/high-school-sweetheart/mix.exs
@@ -5,7 +5,6 @@ defmodule HighSchoolSweetheart.MixProject do
     [
       app: :high_school_sweetheart,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/high-score/.meta/config.json b/exercises/concept/high-score/.meta/config.json
index 947ae73cd4..5efe08add1 100644
--- a/exercises/concept/high-score/.meta/config.json
+++ b/exercises/concept/high-score/.meta/config.json
@@ -13,7 +13,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "high-scores",
   "blurb": "Learn about maps by keeping track of the high scores in your local arcade hall."
 }
diff --git a/exercises/concept/high-score/mix.exs b/exercises/concept/high-score/mix.exs
index 896cd6410e..d1118c177c 100644
--- a/exercises/concept/high-score/mix.exs
+++ b/exercises/concept/high-score/mix.exs
@@ -5,7 +5,6 @@ defmodule HighScore.MixProject do
     [
       app: :high_score,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/kitchen-calculator/.meta/config.json b/exercises/concept/kitchen-calculator/.meta/config.json
index 957060f174..22707b500e 100644
--- a/exercises/concept/kitchen-calculator/.meta/config.json
+++ b/exercises/concept/kitchen-calculator/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about tuples and pattern matching by converting common US baking measurements to the metric system."
 }
diff --git a/exercises/concept/kitchen-calculator/mix.exs b/exercises/concept/kitchen-calculator/mix.exs
index f27d87b40d..56c8b978e5 100644
--- a/exercises/concept/kitchen-calculator/mix.exs
+++ b/exercises/concept/kitchen-calculator/mix.exs
@@ -5,7 +5,6 @@ defmodule KitchenCalculator.MixProject do
     [
       app: :kitchen_calculator,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/language-list/.meta/config.json b/exercises/concept/language-list/.meta/config.json
index c87ffb7020..be735c0e71 100644
--- a/exercises/concept/language-list/.meta/config.json
+++ b/exercises/concept/language-list/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "clojure/tracks-on-tracks-on-tracks"
   ],
diff --git a/exercises/concept/language-list/mix.exs b/exercises/concept/language-list/mix.exs
index 2d50d7ad31..e40eb07411 100644
--- a/exercises/concept/language-list/mix.exs
+++ b/exercises/concept/language-list/mix.exs
@@ -5,7 +5,6 @@ defmodule LanguageList.MixProject do
     [
       app: :language_list,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/lasagna/.meta/config.json b/exercises/concept/lasagna/.meta/config.json
index 2672002000..82577602a4 100644
--- a/exercises/concept/lasagna/.meta/config.json
+++ b/exercises/concept/lasagna/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/lucians-luscious-lasagna"
   ],
diff --git a/exercises/concept/lasagna/mix.exs b/exercises/concept/lasagna/mix.exs
index 09705834a1..ad7910c22c 100644
--- a/exercises/concept/lasagna/mix.exs
+++ b/exercises/concept/lasagna/mix.exs
@@ -5,7 +5,6 @@ defmodule Lasagna.MixProject do
     [
       app: :lasagna,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/library-fees/.meta/config.json b/exercises/concept/library-fees/.meta/config.json
index 060a2ecb8c..515a3608ae 100644
--- a/exercises/concept/library-fees/.meta/config.json
+++ b/exercises/concept/library-fees/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about dates and time by calculating late fees for the local library."
 }
diff --git a/exercises/concept/library-fees/mix.exs b/exercises/concept/library-fees/mix.exs
index 2c859d3704..cec9d6da83 100644
--- a/exercises/concept/library-fees/mix.exs
+++ b/exercises/concept/library-fees/mix.exs
@@ -5,7 +5,6 @@ defmodule LibraryFees.MixProject do
     [
       app: :library_fees,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/log-level/.meta/config.json b/exercises/concept/log-level/.meta/config.json
index bd25fce729..702098dd18 100644
--- a/exercises/concept/log-level/.meta/config.json
+++ b/exercises/concept/log-level/.meta/config.json
@@ -13,7 +13,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/logs-logs-logs"
   ],
diff --git a/exercises/concept/log-level/mix.exs b/exercises/concept/log-level/mix.exs
index 46d643db5f..0c709f6345 100644
--- a/exercises/concept/log-level/mix.exs
+++ b/exercises/concept/log-level/mix.exs
@@ -5,7 +5,6 @@ defmodule LogLevel.MixProject do
     [
       app: :log_level,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/log-parser/.meta/config.json b/exercises/concept/log-parser/.meta/config.json
index 32ffb975d3..51d53b7b6d 100644
--- a/exercises/concept/log-parser/.meta/config.json
+++ b/exercises/concept/log-parser/.meta/config.json
@@ -13,7 +13,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "go/parsing-log-files"
   ],
diff --git a/exercises/concept/log-parser/mix.exs b/exercises/concept/log-parser/mix.exs
index 3e208a9e8b..6ee625ccbb 100644
--- a/exercises/concept/log-parser/mix.exs
+++ b/exercises/concept/log-parser/mix.exs
@@ -5,7 +5,6 @@ defmodule LogParser.MixProject do
     [
       app: :log_parser,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/lucas-numbers/.meta/config.json b/exercises/concept/lucas-numbers/.meta/config.json
index 3434023dd6..aa31de1782 100644
--- a/exercises/concept/lucas-numbers/.meta/config.json
+++ b/exercises/concept/lucas-numbers/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about streams by generating the Lucas number sequence."
 }
diff --git a/exercises/concept/lucas-numbers/mix.exs b/exercises/concept/lucas-numbers/mix.exs
index 8cd4830a76..bb1f162066 100644
--- a/exercises/concept/lucas-numbers/mix.exs
+++ b/exercises/concept/lucas-numbers/mix.exs
@@ -5,7 +5,6 @@ defmodule LucasNumbers.MixProject do
     [
       app: :lucas_numbers,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/mensch-aergere-dich-nicht/.meta/config.json b/exercises/concept/mensch-aergere-dich-nicht/.meta/config.json
index fe63f3b27e..0c4743e1fd 100644
--- a/exercises/concept/mensch-aergere-dich-nicht/.meta/config.json
+++ b/exercises/concept/mensch-aergere-dich-nicht/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "no-op"
 }
diff --git a/exercises/concept/mensch-aergere-dich-nicht/mix.exs b/exercises/concept/mensch-aergere-dich-nicht/mix.exs
index b3b31e6dda..e491916b2e 100644
--- a/exercises/concept/mensch-aergere-dich-nicht/mix.exs
+++ b/exercises/concept/mensch-aergere-dich-nicht/mix.exs
@@ -5,7 +5,6 @@ defmodule MenschAergereDichNicht.MixProject do
     [
       app: :mensch_aergere_dich_nicht,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/name-badge/.meta/config.json b/exercises/concept/name-badge/.meta/config.json
index d4f1cbefb2..ce3369127f 100644
--- a/exercises/concept/name-badge/.meta/config.json
+++ b/exercises/concept/name-badge/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/tim-from-marketing"
   ],
diff --git a/exercises/concept/name-badge/mix.exs b/exercises/concept/name-badge/mix.exs
index 2709c17370..97c49fed67 100644
--- a/exercises/concept/name-badge/mix.exs
+++ b/exercises/concept/name-badge/mix.exs
@@ -5,7 +5,6 @@ defmodule NameBadge.MixProject do
     [
       app: :name_badge,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/need-for-speed/.meta/config.json b/exercises/concept/need-for-speed/.meta/config.json
index db08d8235f..b24399ab24 100644
--- a/exercises/concept/need-for-speed/.meta/config.json
+++ b/exercises/concept/need-for-speed/.meta/config.json
@@ -20,7 +20,6 @@
       "lib/need_for_speed/remote_control_car.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/need-for-speed"
   ],
diff --git a/exercises/concept/need-for-speed/mix.exs b/exercises/concept/need-for-speed/mix.exs
index 798f006a69..d0c0b26f4b 100644
--- a/exercises/concept/need-for-speed/mix.exs
+++ b/exercises/concept/need-for-speed/mix.exs
@@ -5,7 +5,6 @@ defmodule RemoteControlCar.MixProject do
     [
       app: :need_for_speed,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/new-passport/.meta/config.json b/exercises/concept/new-passport/.meta/config.json
index f5ca7054f5..0c54b115b5 100644
--- a/exercises/concept/new-passport/.meta/config.json
+++ b/exercises/concept/new-passport/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about `with` to concentrate on the happy path and manage a stressful day of facing bureaucracy."
 }
diff --git a/exercises/concept/new-passport/mix.exs b/exercises/concept/new-passport/mix.exs
index 5c0bac2f21..a9ecf68da3 100644
--- a/exercises/concept/new-passport/mix.exs
+++ b/exercises/concept/new-passport/mix.exs
@@ -5,7 +5,6 @@ defmodule NewPassport.MixProject do
     [
       app: :new_passport,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/newsletter/.meta/config.json b/exercises/concept/newsletter/.meta/config.json
index 6fb0b15f6e..46d09284f7 100644
--- a/exercises/concept/newsletter/.meta/config.json
+++ b/exercises/concept/newsletter/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about working with files by sending out a newsletter."
 }
diff --git a/exercises/concept/newsletter/mix.exs b/exercises/concept/newsletter/mix.exs
index 93fb4fb973..c5fb71f03a 100644
--- a/exercises/concept/newsletter/mix.exs
+++ b/exercises/concept/newsletter/mix.exs
@@ -5,7 +5,6 @@ defmodule Newsletter.MixProject do
     [
       app: :newsletter,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/pacman-rules/.meta/config.json b/exercises/concept/pacman-rules/.meta/config.json
index d54d621e0f..8d87c74a88 100644
--- a/exercises/concept/pacman-rules/.meta/config.json
+++ b/exercises/concept/pacman-rules/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about booleans by implementing the rules of the Pac-Man game."
 }
diff --git a/exercises/concept/pacman-rules/mix.exs b/exercises/concept/pacman-rules/mix.exs
index f592497d5d..eceab6865d 100644
--- a/exercises/concept/pacman-rules/mix.exs
+++ b/exercises/concept/pacman-rules/mix.exs
@@ -5,7 +5,6 @@ defmodule Rules.MixProject do
     [
       app: :pacman_rules,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/paint-by-number/.docs/instructions.md b/exercises/concept/paint-by-number/.docs/instructions.md
index 94a7415f98..c1c1cb0a1f 100644
--- a/exercises/concept/paint-by-number/.docs/instructions.md
+++ b/exercises/concept/paint-by-number/.docs/instructions.md
@@ -44,7 +44,7 @@ PaintByNumber.palette_bit_size(13)
 # => 4
 ```
 
-Note: there is no `log2` function in the Elixir standard library. You will later learn how to use [Erlang libraries][erlang-libraries] from Elixir where you can find this function. Now, solve this task with recursion and the [`Integer.pow/2`][integer-pow] function instead. If you're solving this exercise on your own computer using an older Elixir version (1.11 or lower) that doesn't have `Integer.pow/2` function, use the `Math.pow/2` function we provided in the `lib/math.ex` file for this exercise.
+Note: there is no `log2` function in the Elixir standard library. You will later learn how to use [Erlang libraries][erlang-libraries] from Elixir where you can find this function. Now, solve this task with recursion and the [`Integer.pow/2`][integer-pow] function instead.
 
 ## 2. Create an empty picture
 
diff --git a/exercises/concept/paint-by-number/.meta/config.json b/exercises/concept/paint-by-number/.meta/config.json
index a76aee7021..e7470127fa 100644
--- a/exercises/concept/paint-by-number/.meta/config.json
+++ b/exercises/concept/paint-by-number/.meta/config.json
@@ -17,11 +17,7 @@
     ],
     "exemplar": [
       ".meta/exemplar.ex"
-    ],
-    "editor": [
-      "lib/math.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about bitstrings by creating binary files with pictures for a paint-by-number app."
 }
diff --git a/exercises/concept/paint-by-number/.meta/exemplar.ex b/exercises/concept/paint-by-number/.meta/exemplar.ex
index c25338c267..0bb1478748 100644
--- a/exercises/concept/paint-by-number/.meta/exemplar.ex
+++ b/exercises/concept/paint-by-number/.meta/exemplar.ex
@@ -4,7 +4,7 @@ defmodule PaintByNumber do
   end
 
   defp do_palette_bit_size(color_count, bits \\ 1) do
-    if Math.pow(2, bits) >= color_count do
+    if Integer.pow(2, bits) >= color_count do
       bits
     else
       do_palette_bit_size(color_count, bits + 1)
diff --git a/exercises/concept/paint-by-number/lib/math.ex b/exercises/concept/paint-by-number/lib/math.ex
deleted file mode 100644
index 7f04d9da6d..0000000000
--- a/exercises/concept/paint-by-number/lib/math.ex
+++ /dev/null
@@ -1,18 +0,0 @@
-# You can ignore this file if you're solving this exercise in the web editor,
-# or on your own computer if you have Elixir version 1.12 or higher.
-# You can check which Elixir version you have by running `elixir -v` in your terminal.
-defmodule Math do
-  import Bitwise
-
-  # copied from https://github.com/elixir-lang/elixir/blob/v1.12.0/lib/elixir/lib/integer.ex#L103-L114
-  def pow(base, exponent) when is_integer(base) and is_integer(exponent) do
-    if exponent < 0, do: raise("exponent cannot be negative")
-    guarded_pow(base, exponent)
-  end
-
-  # https://en.wikipedia.org/wiki/Exponentiation_by_squaring
-  defp guarded_pow(_, 0), do: 1
-  defp guarded_pow(b, 1), do: b
-  defp guarded_pow(b, e) when (e &&& 1) == 0, do: guarded_pow(b * b, e >>> 1)
-  defp guarded_pow(b, e), do: b * guarded_pow(b * b, e >>> 1)
-end
diff --git a/exercises/concept/paint-by-number/mix.exs b/exercises/concept/paint-by-number/mix.exs
index dc252d97c2..baaa1428ef 100644
--- a/exercises/concept/paint-by-number/mix.exs
+++ b/exercises/concept/paint-by-number/mix.exs
@@ -5,7 +5,6 @@ defmodule PaintByNumber.MixProject do
     [
       app: :paint_by_number,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/remote-control-car/.meta/config.json b/exercises/concept/remote-control-car/.meta/config.json
index 1c837b9522..63363aebbd 100644
--- a/exercises/concept/remote-control-car/.meta/config.json
+++ b/exercises/concept/remote-control-car/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "forked_from": [
     "csharp/elons-toys"
   ],
diff --git a/exercises/concept/remote-control-car/mix.exs b/exercises/concept/remote-control-car/mix.exs
index 6d49c1da4c..9e32ce8c15 100644
--- a/exercises/concept/remote-control-car/mix.exs
+++ b/exercises/concept/remote-control-car/mix.exs
@@ -5,7 +5,6 @@ defmodule RemoteControlCar.MixProject do
     [
       app: :remote_control_car,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/rpg-character-sheet/.meta/config.json b/exercises/concept/rpg-character-sheet/.meta/config.json
index 0a44692c48..bea7631fe9 100644
--- a/exercises/concept/rpg-character-sheet/.meta/config.json
+++ b/exercises/concept/rpg-character-sheet/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "wizards-and-warriors",
   "blurb": "Learn about IO (input/output) by guiding your friends through the character creation process for your pen-and-paper role-playing game."
 }
diff --git a/exercises/concept/rpg-character-sheet/mix.exs b/exercises/concept/rpg-character-sheet/mix.exs
index 408f46271f..92c3732b63 100644
--- a/exercises/concept/rpg-character-sheet/mix.exs
+++ b/exercises/concept/rpg-character-sheet/mix.exs
@@ -5,7 +5,6 @@ defmodule RPG.MixProject do
     [
       app: :rpg_character_sheet,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/rpn-calculator-inspection/.meta/config.json b/exercises/concept/rpn-calculator-inspection/.meta/config.json
index 985fd08c6b..5e83e2d29b 100644
--- a/exercises/concept/rpn-calculator-inspection/.meta/config.json
+++ b/exercises/concept/rpn-calculator-inspection/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "instruments-of-texas",
   "blurb": "Learn about tasks and links by inspecting a working prototype of your experimental Reverse Polish Notation calculator."
 }
diff --git a/exercises/concept/rpn-calculator-inspection/mix.exs b/exercises/concept/rpn-calculator-inspection/mix.exs
index dcc0cbf48b..2d2d2f881c 100644
--- a/exercises/concept/rpn-calculator-inspection/mix.exs
+++ b/exercises/concept/rpn-calculator-inspection/mix.exs
@@ -5,7 +5,6 @@ defmodule RPNCalculator.MixProject do
     [
       app: :rpn_calculator_inspection,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/rpn-calculator-output/.meta/config.json b/exercises/concept/rpn-calculator-output/.meta/config.json
index 0316057463..466d9dc78b 100644
--- a/exercises/concept/rpn-calculator-output/.meta/config.json
+++ b/exercises/concept/rpn-calculator-output/.meta/config.json
@@ -17,7 +17,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "calculator-conundrum",
   "blurb": "Learn about dynamic dispatch and advanced options for rescuing errors by implementing an output in your experimental Reverse Polish Notation calculator."
 }
diff --git a/exercises/concept/rpn-calculator-output/mix.exs b/exercises/concept/rpn-calculator-output/mix.exs
index 178627d2a1..251faad906 100644
--- a/exercises/concept/rpn-calculator-output/mix.exs
+++ b/exercises/concept/rpn-calculator-output/mix.exs
@@ -5,7 +5,6 @@ defmodule RPNCalculator.MixProject do
     [
       app: :rpn_calculator_output,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/rpn-calculator/.meta/config.json b/exercises/concept/rpn-calculator/.meta/config.json
index 3767236b59..a8190b252b 100644
--- a/exercises/concept/rpn-calculator/.meta/config.json
+++ b/exercises/concept/rpn-calculator/.meta/config.json
@@ -17,7 +17,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "instruments-of-texas",
   "blurb": "Learn about errors and rescuing them by working on an experimental Reverse Polish Notation calculator."
 }
diff --git a/exercises/concept/rpn-calculator/mix.exs b/exercises/concept/rpn-calculator/mix.exs
index de2dbe180d..5bbcbec57a 100644
--- a/exercises/concept/rpn-calculator/mix.exs
+++ b/exercises/concept/rpn-calculator/mix.exs
@@ -5,7 +5,6 @@ defmodule RPNCalculator.MixProject do
     [
       app: :rpn_calculator,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/secrets/.meta/config.json b/exercises/concept/secrets/.meta/config.json
index fc9f708c5e..f6830a88c7 100644
--- a/exercises/concept/secrets/.meta/config.json
+++ b/exercises/concept/secrets/.meta/config.json
@@ -13,6 +13,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about bit manipulation and anonymous functions by writing the software for an encryption device."
 }
diff --git a/exercises/concept/secrets/.meta/exemplar.ex b/exercises/concept/secrets/.meta/exemplar.ex
index d484def837..07555f5722 100644
--- a/exercises/concept/secrets/.meta/exemplar.ex
+++ b/exercises/concept/secrets/.meta/exemplar.ex
@@ -1,7 +1,4 @@
 defmodule Secrets do
-  # only needed for Elixir < 1.10
-  require Bitwise
-
   def secret_add(secret) do
     fn x -> x + secret end
   end
diff --git a/exercises/concept/secrets/mix.exs b/exercises/concept/secrets/mix.exs
index ebcba98f10..f00b334c92 100644
--- a/exercises/concept/secrets/mix.exs
+++ b/exercises/concept/secrets/mix.exs
@@ -5,7 +5,6 @@ defmodule Secrets.MixProject do
     [
       app: :secrets,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/stack-underflow/.meta/config.json b/exercises/concept/stack-underflow/.meta/config.json
index 8f7f2bcc93..99afd86c5e 100644
--- a/exercises/concept/stack-underflow/.meta/config.json
+++ b/exercises/concept/stack-underflow/.meta/config.json
@@ -16,7 +16,6 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "error-handling",
   "blurb": "Learn about defining custom exceptions by continuing work on your experimental Reverse Polish Notation calculator."
 }
diff --git a/exercises/concept/stack-underflow/mix.exs b/exercises/concept/stack-underflow/mix.exs
index 12236d0622..2e90552a02 100644
--- a/exercises/concept/stack-underflow/mix.exs
+++ b/exercises/concept/stack-underflow/mix.exs
@@ -5,7 +5,6 @@ defmodule RPNCalculator.MixProject do
     [
       app: :stack_underflow,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/take-a-number-deluxe/.meta/config.json b/exercises/concept/take-a-number-deluxe/.meta/config.json
index 05e29d69a0..9815d61473 100644
--- a/exercises/concept/take-a-number-deluxe/.meta/config.json
+++ b/exercises/concept/take-a-number-deluxe/.meta/config.json
@@ -20,7 +20,6 @@
       "lib/take_a_number_deluxe/queue.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "icon": "take-a-number",
   "blurb": "Learn about GenServers by writing an embedded system for a Take-A-Number machine."
 }
diff --git a/exercises/concept/take-a-number-deluxe/mix.exs b/exercises/concept/take-a-number-deluxe/mix.exs
index af96157091..708a981cf4 100644
--- a/exercises/concept/take-a-number-deluxe/mix.exs
+++ b/exercises/concept/take-a-number-deluxe/mix.exs
@@ -5,7 +5,6 @@ defmodule TakeANumber.MixProject do
     [
       app: :take_a_number_deluxe,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/take-a-number/.meta/config.json b/exercises/concept/take-a-number/.meta/config.json
index 9e2e943030..24f71695db 100644
--- a/exercises/concept/take-a-number/.meta/config.json
+++ b/exercises/concept/take-a-number/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about processes and process identifiers by writing an embedded system for a Take-A-Number machine."
 }
diff --git a/exercises/concept/take-a-number/mix.exs b/exercises/concept/take-a-number/mix.exs
index 36ac6a67da..e3186cf0a8 100644
--- a/exercises/concept/take-a-number/mix.exs
+++ b/exercises/concept/take-a-number/mix.exs
@@ -5,7 +5,6 @@ defmodule TakeANumber.MixProject do
     [
       app: :take_a_number,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/top-secret/.meta/config.json b/exercises/concept/top-secret/.meta/config.json
index fbefcdb2fc..c77dc3fbc3 100644
--- a/exercises/concept/top-secret/.meta/config.json
+++ b/exercises/concept/top-secret/.meta/config.json
@@ -14,6 +14,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about the Abstract Syntax Tree (AST) by helping decode secret messages from Agent Ex."
 }
diff --git a/exercises/concept/top-secret/mix.exs b/exercises/concept/top-secret/mix.exs
index e670bb8d6d..64c31d5cf0 100644
--- a/exercises/concept/top-secret/mix.exs
+++ b/exercises/concept/top-secret/mix.exs
@@ -5,7 +5,6 @@ defmodule TopSecret.MixProject do
     [
       app: :top_secret,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/concept/wine-cellar/.meta/config.json b/exercises/concept/wine-cellar/.meta/config.json
index ec011dac1b..ed2b313114 100644
--- a/exercises/concept/wine-cellar/.meta/config.json
+++ b/exercises/concept/wine-cellar/.meta/config.json
@@ -16,6 +16,5 @@
       ".meta/exemplar.ex"
     ]
   },
-  "language_versions": ">=1.10",
   "blurb": "Learn about keyword lists by providing wine suggestions to the customers in your restaurant."
 }
diff --git a/exercises/concept/wine-cellar/mix.exs b/exercises/concept/wine-cellar/mix.exs
index 043ecc93f9..8899a55f56 100644
--- a/exercises/concept/wine-cellar/mix.exs
+++ b/exercises/concept/wine-cellar/mix.exs
@@ -5,7 +5,6 @@ defmodule WineCellar.MixProject do
     [
       app: :wine_cellar,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/practice/armstrong-numbers/.meta/example.ex b/exercises/practice/armstrong-numbers/.meta/example.ex
index 16c413774a..ed6958eac9 100644
--- a/exercises/practice/armstrong-numbers/.meta/example.ex
+++ b/exercises/practice/armstrong-numbers/.meta/example.ex
@@ -9,19 +9,7 @@ defmodule ArmstrongNumber do
     exponent = length(digits)
 
     Enum.reduce(digits, 0, fn number, acc ->
-      pow(number, exponent) + acc
+      Integer.pow(number, exponent) + acc
     end) == number
   end
-
-  defp pow(number, exponent) do
-    # in Elixir 1.12 and above, could be:
-    # Integer.pow(number, exponent)
-    do_pow(number, exponent)
-  end
-
-  defp do_pow(number, 1), do: number
-
-  defp do_pow(number, exponent) when is_integer(exponent) and exponent > 1 do
-    number * pow(number, exponent - 1)
-  end
 end
diff --git a/exercises/practice/bottle-song/mix.exs b/exercises/practice/bottle-song/mix.exs
index b6cac602f8..7b8594f560 100644
--- a/exercises/practice/bottle-song/mix.exs
+++ b/exercises/practice/bottle-song/mix.exs
@@ -5,7 +5,7 @@ defmodule BottleSong.MixProject do
     [
       app: :bottle_song,
       version: "1.0.0",
-      elixir: "~> 1.10",
+      # elixir: "~> 1.8",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/practice/game-of-life/mix.exs b/exercises/practice/game-of-life/mix.exs
index 91b15ac62a..6d152fbd17 100644
--- a/exercises/practice/game-of-life/mix.exs
+++ b/exercises/practice/game-of-life/mix.exs
@@ -5,7 +5,6 @@ defmodule GameOfLife.MixProject do
     [
       app: :game_of_life,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/practice/ledger/mix.exs b/exercises/practice/ledger/mix.exs
index ddbc1da0a9..45c1c66106 100644
--- a/exercises/practice/ledger/mix.exs
+++ b/exercises/practice/ledger/mix.exs
@@ -5,7 +5,6 @@ defmodule Ledger.MixProject do
     [
       app: :ledger,
       version: "0.1.0",
-      # elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps()
     ]
diff --git a/exercises/practice/resistor-color-duo/.docs/instructions.md b/exercises/practice/resistor-color-duo/.docs/instructions.md
index bdcd549b1a..4ae694da02 100644
--- a/exercises/practice/resistor-color-duo/.docs/instructions.md
+++ b/exercises/practice/resistor-color-duo/.docs/instructions.md
@@ -17,17 +17,17 @@ The program will take color names as input and output a two digit number, even i
 
 The band colors are encoded as follows:
 
-- Black: 0
-- Brown: 1
-- Red: 2
-- Orange: 3
-- Yellow: 4
-- Green: 5
-- Blue: 6
-- Violet: 7
-- Grey: 8
-- White: 9
+- black: 0
+- brown: 1
+- red: 2
+- orange: 3
+- yellow: 4
+- green: 5
+- blue: 6
+- violet: 7
+- grey: 8
+- white: 9
 
 From the example above:
-brown-green should return 15
+brown-green should return 15, and
 brown-green-violet should return 15 too, ignoring the third color.
diff --git a/exercises/practice/resistor-color-trio/.docs/instructions.md b/exercises/practice/resistor-color-trio/.docs/instructions.md
index 59d22783b9..1ac5cf5e9f 100644
--- a/exercises/practice/resistor-color-trio/.docs/instructions.md
+++ b/exercises/practice/resistor-color-trio/.docs/instructions.md
@@ -12,16 +12,16 @@ For this exercise, you need to know only three things about them:
   The program will take 3 colors as input, and outputs the correct value, in ohms.
   The color bands are encoded as follows:
 
-- Black: 0
-- Brown: 1
-- Red: 2
-- Orange: 3
-- Yellow: 4
-- Green: 5
-- Blue: 6
-- Violet: 7
-- Grey: 8
-- White: 9
+- black: 0
+- brown: 1
+- red: 2
+- orange: 3
+- yellow: 4
+- green: 5
+- blue: 6
+- violet: 7
+- grey: 8
+- white: 9
 
 In Resistor Color Duo you decoded the first two colors.
 For instance: orange-orange got the main value `33`.
diff --git a/exercises/practice/resistor-color/.docs/instructions.md b/exercises/practice/resistor-color/.docs/instructions.md
index 646c14398f..0125e718b4 100644
--- a/exercises/practice/resistor-color/.docs/instructions.md
+++ b/exercises/practice/resistor-color/.docs/instructions.md
@@ -15,16 +15,16 @@ In this exercise you are going to create a helpful program so that you don't hav
 
 These colors are encoded as follows:
 
-- Black: 0
-- Brown: 1
-- Red: 2
-- Orange: 3
-- Yellow: 4
-- Green: 5
-- Blue: 6
-- Violet: 7
-- Grey: 8
-- White: 9
+- black: 0
+- brown: 1
+- red: 2
+- orange: 3
+- yellow: 4
+- green: 5
+- blue: 6
+- violet: 7
+- grey: 8
+- white: 9
 
 The goal of this exercise is to create a way:
 
diff --git a/exercises/practice/word-count/.meta/example.ex b/exercises/practice/word-count/.meta/example.ex
index 277a373548..5762ebb374 100644
--- a/exercises/practice/word-count/.meta/example.ex
+++ b/exercises/practice/word-count/.meta/example.ex
@@ -9,7 +9,7 @@ defmodule WordCount do
     sentence
     |> normalize()
     |> split
-    |> frequencies()
+    |> Enum.frequencies()
   end
 
   defp normalize(string) do
@@ -23,12 +23,4 @@ defmodule WordCount do
     |> Regex.scan(string)
     |> List.flatten()
   end
-
-  defp frequencies(strings) do
-    # Enum.frequencies is only available from Elixir 1.10
-    strings
-    |> Enum.reduce(%{}, fn word, count ->
-      Map.update(count, word, 1, &(&1 + 1))
-    end)
-  end
 end