diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53d4c01..70d6159 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.4.0 / 2020-02-17
+
+### Changes
+
+* Refactor mmdiag waiter metric collection
+
 ## 0.3.1 / 2020-02-17
 
 ### Fixes
diff --git a/VERSION b/VERSION
index 9e11b32..1d0ba9e 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3.1
+0.4.0