diff --git a/.github/workflows/extensions-build.yml b/.github/workflows/extensions-build.yml
index d69a3b14..0deb98c5 100644
--- a/.github/workflows/extensions-build.yml
+++ b/.github/workflows/extensions-build.yml
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         php_version: [8.3]
-        alpine_version: [3.20]
+        alpine_version: ['3.20']
 
     steps:
       - name: Checkout repository