diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a56e7e0..9400c6e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,7 @@ jobs:
         include:
         - ruby: 3.1
           gemfile: Gemfile
-        - ruby: 3.0
+        - ruby: "3.0"
           gemfile: gemfiles/rails61.gemfile
         - ruby: 2.7
           gemfile: gemfiles/rails60.gemfile