diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 68db696..460a23b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["2.6"]
+        ruby-version: ["2.6.6"]
 
     steps:
       - uses: actions/checkout@v3