diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 233c0810..e6320431 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,7 @@ jobs:
           - ubuntu-latest
 
         php-version:
+          - "7.1"
           - "7.2"
           - "7.3"
           - "7.4"