diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00c0628d..9d3df66b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.40
+ - fix unitialized custom-serialized objects
+ - allow serializing pkg-modules by name
+
 ## 0.4.39
  - backward compatibility support for windows 7 by changing the default IO type to IOStream (#509) (@HongBinYu-hub)
 
diff --git a/Project.toml b/Project.toml
index b52cf501..01cd6d94 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "JLD2"
 uuid = "033835bb-8acc-5ee8-8aae-3f567f8a3819"
-version = "0.4.39"
+version = "0.4.40"
 
 [deps]
 FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"