diff --git a/.rubocop.yml b/.rubocop.yml
index 94d1245..beb2d18 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -7,63 +7,69 @@ AllCops:
 # ——————————————————————————————————————————————————————————————————————————————————————————————————
 
 Style/MixinUsage:
-  Enabled: no
+  Enabled: false
 Style/FormatString:
-  Enabled: no
+  Enabled: false
 Style/FormatStringToken:
-  Enabled: no
+  Enabled: false
 Style/StringConcatenation:
-  Enabled: no
+  Enabled: false
 Style/IfUnlessModifier:
-  Enabled: no
+  Enabled: false
 Style/RedundantReturn:
-  Enabled: no
+  Enabled: false
 Style/FrozenStringLiteralComment:
-  Enabled: no
+  Enabled: false
 Style/NegatedIf:
-  Enabled: no
+  Enabled: false
 Style/NegatedWhile:
-  Enabled: no
+  Enabled: false
 Style/Documentation:
-  Enabled: no
+  Enabled: false
 Style/MultilineBlockChain:
-  Enabled: no
+  Enabled: false
 Style/PerlBackrefs:
-  Enabled: no
+  Enabled: false
 Style/StderrPuts:
-  Enabled: no
+  Enabled: false
 Style/ClassAndModuleChildren:
-  Enabled: no
+  Enabled: false
 Style/ZeroLengthPredicate:
-  Enabled: no
+  Enabled: false
 Style/GuardClause:
-  Enabled: no
+  Enabled: false
 Style/WhileUntilModifier:
-  Enabled: no
+  Enabled: false
 Style/MutableConstant:
-  Enabled: no
+  Enabled: false
 Style/ClassVars:
-  Enabled: no
+  Enabled: false
 
 Metrics/AbcSize:
-  Enabled: no
+  Enabled: false
 Metrics/PerceivedComplexity:
-  Enabled: no
+  Enabled: false
 Metrics/CyclomaticComplexity:
-  Enabled: no
+  Enabled: false
+Metrics/MethodLength:
+  Enabled: false
+Metrics/BlockLength:
+  Enabled: false
+Metrics/ClassLength:
+  Enabled: false
 
 Naming/HeredocDelimiterNaming:
-  Enabled: no
+  Enabled: false
 Naming/AccessorMethodName:
-  Enabled: no
+  Enabled: false
 Naming/MethodParameterName:
-  Enabled: no
+  Enabled: false
 
 Layout/LineLength:
   Enabled: false
 
 Lint/AmbiguousOperatorPrecedence:
-  Enabled: no
+  Enabled: false
 
 # ——————————————————————————————————————————————————————————————————————————————————————————————————
 # Configured
@@ -79,7 +85,7 @@ Style/Semicolon:
   AllowAsExpressionSeparator: yes
 
 Style/MethodCallWithArgsParentheses:
-  Enabled: yes
+  Enabled: true
   IgnoreMacros: false # Top-level calls will not be included otherwise.
   AllowedMethods:
     - puts
@@ -102,7 +108,7 @@ Style/MethodCallWithArgsParentheses:
     - source
 
 Style/RescueModifier:
-  Enabled: no
+  Enabled: false
 
 Style/RescueStandardError:
   EnforcedStyle: implicit
@@ -139,3 +145,6 @@ Layout/IndentationWidth:
 
 Layout/SpaceAroundOperators:
   EnforcedStyleForExponentOperator: space
+
+Gemspec/DevelopmentDependencies:
+  EnforcedStyle: gemspec
diff --git a/Gemfile.lock b/Gemfile.lock
index 2255500..2e295a1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,6 +4,7 @@ PATH
     enparallel-bin (1.0.11)
       colorize (~> 0.8.1)
       docopt (~> 0.6.1)
+      json (~> 2.7)
       require_all (~> 3.0)
       soml (~> 1.0.1)
 
@@ -14,6 +15,7 @@ GEM
     diff-lcs (1.4.4)
     docile (1.4.0)
     docopt (0.6.1)
+    json (2.7.1)
     rake (13.0.6)
     require_all (3.0.0)
     rspec (3.10.0)
diff --git a/Justfile b/Justfile
index 84f38d4..7c2a8ed 100644
--- a/Justfile
+++ b/Justfile
@@ -8,40 +8,39 @@ import? 'internal.just'
 help:
     just --list --unsorted
 
-# build gem
-build:
-    bundle exec rake build
-
-# remove built gems
-clean:
-    rm -vf pkg/*
-
-# build and install the gem globally to the system
-install:
-    bundle exec rake install
+init:
+    bundle install
 
-# run the gem's binary
 run +args:
     {{ BIN }} {{ args }}
 
-# run tests
+fmt:
+    just --fmt
+
+lint:
+    rubocop
+
+fix:
+    rubocop -A
+
 test:
     bundle exec rspec
     echo
     echo o coverage/index.html
 
-# build the asciicasts of enparallel in action
+build:
+    bundle exec rake build
+
+install:
+    bundle exec rake install
+
+clean:
+    rm -vf pkg/*
+
+# build the asciicasts
 build-readme:
     tools/build-readme
 
 # run 50 unpredictable tasks
 run-50:
     seq 50 | {{ BIN }} --workers 32 --pick random -- tools/unpredictable-task
-
-# run linter
-lint:
-    rubocop
-
-# fix lint errors
-fix:
-    rubocop -a
diff --git a/enparallel.gemspec b/enparallel.gemspec
index ea6b34a..26c6569 100644
--- a/enparallel.gemspec
+++ b/enparallel.gemspec
@@ -16,6 +16,7 @@ Gem::Specification.new do |spec|
 
     spec.add_runtime_dependency 'colorize', '~> 0.8.1'
     spec.add_runtime_dependency 'docopt', '~> 0.6.1'
+    spec.add_runtime_dependency 'json', '~> 2.7'
     spec.add_runtime_dependency 'require_all', '~> 3.0'
     spec.add_runtime_dependency 'soml', '~> 1.0.1'
 
diff --git a/spec/.rubocop.yml b/spec/.rubocop.yml
index 1e1a060..06ab5ed 100644
--- a/spec/.rubocop.yml
+++ b/spec/.rubocop.yml
@@ -1,6 +1,6 @@
 inherit_from: ../.rubocop.yml
 
 Style/MethodCallWithArgsParentheses:
-  Enabled: no
+  Enabled: false
 Lint/ParenthesesAsGroupedExpression:
-  Enabled: no
+  Enabled: false