diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0a81f7f..009afa2 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,5 +1,8 @@
 name: CI
 
+permissions:
+  contents: read
+
 on:
   push:
     branches: [master]
@@ -8,12 +11,12 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.runner }}
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["3.2.2", "3.3.9", "3.4.0", "3.5.0-preview1"]
-        experimental: [false]
+        ruby-version: ["3.2", "3.3", "3.4", "3.5.0-preview1"]
+        runner: [macos-latest, ubuntu-latest]
     steps:
       - uses: actions/checkout@v5
       - name: Set up Ruby
diff --git a/Gemfile.lock b/Gemfile.lock
deleted file mode 100644
index d8fcb91..0000000
--- a/Gemfile.lock
+++ /dev/null
@@ -1,74 +0,0 @@
-PATH
-  remote: .
-  specs:
-    git-fastclone (1.5.1)
-      colorize
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    ast (2.4.3)
-    colorize (1.1.0)
-    diff-lcs (1.6.2)
-    json (2.15.0)
-    language_server-protocol (3.17.0.5)
-    lint_roller (1.1.0)
-    logger (1.7.0)
-    parallel (1.27.0)
-    parser (3.3.9.0)
-      ast (~> 2.4.1)
-      racc
-    prism (1.5.1)
-    racc (1.8.1)
-    rainbow (3.1.1)
-    rake (13.3.0)
-    regexp_parser (2.11.3)
-    rspec (3.13.1)
-      rspec-core (~> 3.13.0)
-      rspec-expectations (~> 3.13.0)
-      rspec-mocks (~> 3.13.0)
-    rspec-core (3.13.5)
-      rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.5)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.5)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.13.0)
-    rspec-support (3.13.6)
-    rubocop (1.81.1)
-      json (~> 2.3)
-      language_server-protocol (~> 3.17.0.2)
-      lint_roller (~> 1.1.0)
-      parallel (~> 1.10)
-      parser (>= 3.3.0.2)
-      rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 2.9.3, < 3.0)
-      rubocop-ast (>= 1.47.1, < 2.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.47.1)
-      parser (>= 3.3.7.2)
-      prism (~> 1.4)
-    ruby-progressbar (1.13.0)
-    unicode-display_width (3.2.0)
-      unicode-emoji (~> 4.1)
-    unicode-emoji (4.1.0)
-
-PLATFORMS
-  arm64-darwin-22
-  arm64-darwin-23
-  arm64-darwin-24
-  x64-mingw-ucrt
-  x86_64-linux
-
-DEPENDENCIES
-  bundler
-  git-fastclone!
-  logger
-  rake
-  rspec
-  rubocop
-
-BUNDLED WITH
-   2.5.22