diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
index b29beb2..dc40cfc 100644
--- a/.github/workflows/moodle-ci.yml
+++ b/.github/workflows/moodle-ci.yml
@@ -63,12 +63,18 @@ jobs:
             database: pgsql
             plugin-ci: ^4
             # extensions: xmlrpc-beta
-          # Moodle main, PHP 8.3, MariaDB
+          # Moodle 4.5, PHP 8.3, MariaDB
           - php: '8.3'
-            moodle-branch: 'main'
+            moodle-branch: 'MOODLE_405_STABLE'
             database: mariadb
             plugin-ci: ^4
             # extensions: xmlrpc-beta
+          # Moodle main, PHP 8.3, PostgreSQL
+          - php: '8.3'
+            moodle-branch: 'main'
+            database: pgsql
+            plugin-ci: ^4
+            # extensions: xmlrpc-beta
 
     steps:
       - name: Check out repository code