diff --git a/chart/values.yaml b/chart/values.yaml
index 21bec4e89be6763e705c69f9102825d5dd575ec1..b19ede6b32ec7d233cddb1893d2bebb184481f03 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -1648,11 +1648,11 @@ addons:
     git:
       repo: https://repo1.dso.mil/big-bang/product/packages/mattermost.git
       path: "./chart"
-      tag: "9.11.1-bb.1"
+      tag: "10.0.0-bb.0"
     helmRepo:
       repoName: "registry1"
       chartName: "mattermost"
-      tag: "9.11.1-bb.1"
+      tag: "10.0.0-bb.0"
 
     # -- Flux reconciliation overrides specifically for the Mattermost Package
     flux: {}