diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 10bc9bbe..481c2523 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["2.6", "2.7", "3.0", "3.1"]
+        ruby: ["2.5", "2.6", "2.7", "3.0", "3.1"]
     services:
       redis:
         image: redis