diff --git a/conf/app.src b/conf/app.src
index 5954f32..66492ad 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,6 +1,6 @@
-SOURCE_URL=https://releases.mattermost.com/5.1.0/mattermost-5.1.0-linux-amd64.tar.gz
-SOURCE_SUM=7f14412231a852fb307ff0bea9f67dcbc862da9901d55d91d7838b092db6a5ae
+SOURCE_URL=https://releases.mattermost.com/5.2.1/mattermost-5.2.1-linux-amd64.tar.gz
+SOURCE_SUM=7acd675f3975a27a2d42b9244637947390481644ebb1860ab5a36882450a8fbc
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true
-SOURCE_FILENAME=mattermost-5.1.0-linux-amd64.tar.gz
+SOURCE_FILENAME=mattermost-5.2.1-linux-amd64.tar.gz