diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 1254855..ce028b3 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - "master"
+      - "3.x"
 jobs:
   phpunit:
     name: "PHPUnit tests"