diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa6d48f..9c563a2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os:   ['ubuntu', 'macos']
-        ruby: [ '2.5', '2.6', '2.7', '3.0' ]
+        ruby: [ '2.6', '2.7', '3.0' ]
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
@@ -15,4 +15,4 @@ jobs:
           ruby-version: ${{ matrix.ruby }}
       - run: gem install bundler
       - run: bundle install
-      - run: bundle exec rake test
\ No newline at end of file
+      - run: bundle exec rake test