diff --git a/charts/inbox-server/configs/jmap.properties b/charts/inbox-server/configs/jmap.properties
index 9c48daa..2236131 100644
--- a/charts/inbox-server/configs/jmap.properties
+++ b/charts/inbox-server/configs/jmap.properties
@@ -1,5 +1,5 @@
 # Configuration file for JMAP
-
+jmap.version.default=rfc-8621
 enabled=${env:JAMES_JMAP_ENABLED}
 tls.keystoreURL=file://keystore
 tls.secret=${env:JAMES_KEYSTORE_PASSWORD}