diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1e5f1a5..ee3eb8b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,9 +8,9 @@ jobs:
       - uses: actions/checkout@v1
 
       - name: Set up Ruby 2.7
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 2.7.x
+          ruby-version: 2.7.7
 
       - name: Cache gem dependencies
         uses: actions/cache@v1