diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 50a52195..44caf8a5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest ]
-        ruby-version: [2.4, 2.7, 3.0]
+        ruby-version: [2.5, 2.7, 3.0]
 
     runs-on: ${{ matrix.os }}