diff --git a/argocd/apps/mattermost/mattermnost.yaml b/argocd/apps/mattermost/mattermnost.yaml
index 125f870..ff32455 100644
--- a/argocd/apps/mattermost/mattermnost.yaml
+++ b/argocd/apps/mattermost/mattermnost.yaml
@@ -8,7 +8,7 @@ spec:
   project: default
   source:
     repoURL: 'https://helm.mattermost.com'
-    targetRevision: 6.6.*
+    targetRevision: 9.*.*
     helm:
       parameters:
         - name: 'ingress.enabled'