diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index 98c0489..1d6457e 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -6,7 +6,7 @@ jobs:
         strategy:
             matrix:
                 operating-system: [ ubuntu-latest, windows-latest, macos-latest ]
-                php-versions: [ '7.1', '8.0' ]
+                php-versions: [ '5.6', '7.0', '8.0' ]
         runs-on: ${{ matrix.operating-system }}
         steps:
             -   name: Checkout