diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b575efd..4994603 100755
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -37,6 +37,9 @@ jobs:
           - php: '7.4'
             moodle-branch: 'MOODLE_401_STABLE'
             database: 'pgsql'
+          - php: '7.4'
+            moodle-branch: 'MOODLE_400_STABLE'
+            database: 'pgsql'
           - php: '8.2'
             moodle-branch: 'MOODLE_402_STABLE'
             database: 'pgsql'