diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d53c045..8b28378 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -65,6 +65,7 @@ jobs:
     strategy:
       matrix:
         php:
+          - '5.3'
           - '5.4'
           - '5.5'
           - '5.6'