diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 539d207a..9123df3a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -13,6 +13,8 @@ jobs:
             elixir: '1.11'
           - otp: '26.0'
             elixir: '1.15'
+          - otp: '27.0'
+            elixir: '1.17'
     env:
       MIX_ENV: test
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/lib/excoveralls/cobertura.ex b/lib/excoveralls/cobertura.ex
index 9e43540d..dd58bd2e 100644
--- a/lib/excoveralls/cobertura.ex
+++ b/lib/excoveralls/cobertura.ex
@@ -188,7 +188,7 @@ defmodule ExCoveralls.Cobertura do
     # We use Range.new/3 because using x..y//step would give a syntax error on Elixir < 1.12
     defp get_slice_range_for_package_name(c_path), do: Range.new(String.length(c_path) + 1, -1, 1)
   else
-    defp get_slice_range_for_package_name(c_path), do: (String.length(c_path) + 1)..-1
+    defp get_slice_range_for_package_name(c_path), do: Range.new(String.length(c_path) + 1, -1)
   end
 
   defp rate(valid_lines) when length(valid_lines) == 0, do: 0.0
diff --git a/test/settings_test.exs b/test/settings_test.exs
index 07c3197c..66e5869f 100644
--- a/test/settings_test.exs
+++ b/test/settings_test.exs
@@ -15,7 +15,8 @@ defmodule Excoveralls.SettingsTest do
 
   test "returns default file path" do
     assert(Settings.Files.default_file
-           |> Path.relative_to(File.cwd!) == "lib/excoveralls/../conf/coveralls.json")
+           |> Path.expand()
+           |> Path.relative_to(File.cwd!) == "lib/conf/coveralls.json")
   end
 
   test "returns custom file path" do