diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 10b0f23..56862e9 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,7 +40,7 @@ jobs:
         id: setup_php
         uses: shivammathur/setup-php@v2
         with:
-          php-version: ${{ env.PHP_VERSION }}
+          php-version: '${{ env.PHP_VERSION }}'
 
       # Setup Node.
       - name: Setup Node
diff --git a/package/.github/workflows/release.yml b/package/.github/workflows/release.yml
index 4a20bd9..0527f37 100644
--- a/package/.github/workflows/release.yml
+++ b/package/.github/workflows/release.yml
@@ -39,7 +39,7 @@ jobs:
         id: setup_php
         uses: shivammathur/setup-php@v2
         with:
-          php-version: ${{ env.PHP_VERSION }}
+          php-version: '${{ env.PHP_VERSION }}'
 
       # Setup Node.
       - name: Setup Node