diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index e96c346fd..b0ef05b8f 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        php: [7.3, 7.4, 8.0]
+        php: ['7.3', '7.4', '8.0']
     steps:
     - uses: actions/checkout@v1
 
diff --git a/.github/workflows/test-migrations.yml b/.github/workflows/test-migrations.yml
index 053bac66f..34aaf9c3f 100644
--- a/.github/workflows/test-migrations.yml
+++ b/.github/workflows/test-migrations.yml
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        php: [7.3, 7.4, 8.0]
+        php: ['7.3', '7.4', '8.0']
     steps:
       - uses: actions/checkout@v1