diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d30bee4e..790716d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.5', '2.6', '2.7', '3.0.1' ]
+        ruby: [ '2.7', '3.0.1' ]
     name: Ruby ${{ matrix.ruby }}
     steps:
       - uses: actions/checkout@v2