diff --git a/mattermost/metadata.yml b/mattermost/metadata.yml
index ebddceb..c0d0f47 100644
--- a/mattermost/metadata.yml
+++ b/mattermost/metadata.yml
@@ -1,7 +1,7 @@
 description: "Mattermost"
 maintainer: "Valentin Lab <valentin.lab@kalysto.org>"
 ## We fix image here to be sure of what we install
-docker-image: docker.0k.io/mattermost-team
+docker-image: docker.0k.io/mattermost-team:5.15.0
 # docker-image: docker.0k.io/mattermost-enterprise
 config-resources:
   - /mattermost/config