diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 173ae14..81c157a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -33,7 +33,7 @@ jobs:
     - uses: actions/checkout@v6
       with:
         ref: ${{ inputs.ref || github.ref }}
-    - uses: ruby/setup-ruby@v1
+    - uses: ruby/setup-ruby@v1.305.0
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true