diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 97be47bd..3d07f911 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,6 +11,7 @@ jobs:
         ruby-version:
           - "3.0"
           - "2.7"
+          - "2.5"
 
     steps:
     - uses: actions/checkout@v2