diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6f44c1f..e2ccc7b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
           - ubuntu-latest
           - windows-latest
         php-version:
-          - 7.3
+          - 7.1
           - 7.4
         phpunit-version:
           - 7.5.20