diff --git a/.github/workflows/moodle-ci.yml b/.github/workflows/moodle-ci.yml
index 3a7ab48..7e08e4d 100644
--- a/.github/workflows/moodle-ci.yml
+++ b/.github/workflows/moodle-ci.yml
@@ -29,16 +29,16 @@ jobs:
       matrix:
         include:
           - php: '7.2'
-            moodle-branch: 'MOODLE_39_STABLE'
+            moodle-branch: 'MOODLE_38_STABLE'
             database: pgsql
           - php: '7.2'
-            moodle-branch: 'MOODLE_39_STABLE'
+            moodle-branch: 'MOODLE_38_STABLE'
             database: mariadb
           - php: '7.1'
-            moodle-branch: 'MOODLE_39_STABLE'
+            moodle-branch: 'MOODLE_38_STABLE'
             database: pgsql
           - php: '7.1'
-            moodle-branch: 'MOODLE_39_STABLE'
+            moodle-branch: 'MOODLE_38_STABLE'
             database: mariadb
 
     steps: