diff --git a/conf/app.src b/conf/app.src
index 6707dbc..2cf255e 100644
--- a/conf/app.src
+++ b/conf/app.src
@@ -1,5 +1,5 @@
 SOURCE_URL=https://releases.rocket.chat/5.0.5/download
-SOURCE_SUM=
+SOURCE_SUM=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
 SOURCE_SUM_PRG=sha256sum
 SOURCE_FORMAT=tar.gz
 SOURCE_IN_SUBDIR=true