diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index 9a88fb938..cf25e1196 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -1,4 +1,4 @@
-{"4.2.2",
+{VSN,
  [
    {"4.2.1", []},
    {"4.2.0", [