diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 008824f..11a87a0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,7 +13,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest]
-                php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
+                php: ["7.0", "7.1", "7.2", "7.3", "7.4", "8.0", "8.1"]
 
         steps:
             - name: Checkout