diff --git a/SOURCES/modulemd.src.txt b/SOURCES/modulemd.src.txt
index 5219cde..a90e213 100644
--- a/SOURCES/modulemd.src.txt
+++ b/SOURCES/modulemd.src.txt
@@ -34,6 +34,6 @@ data:
     rpms:
       mailman:
         rationale: Module API.
-        ref: stream-2.1-rhel-8.3.0
+        ref: stream-2.1-rhel-8.4.0
         buildorder: 1
 ...