diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e31219..7a5f393 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+# [v0.4.0] 09.01.2023
+
 ## Fixed
 
 - Remove `Default` derive on CDS time provider. This can lead to uninitialized preamble fields.
diff --git a/Cargo.toml b/Cargo.toml
index 0004f8d..778e3c6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "spacepackets"
-version = "0.3.1"
+version = "0.4.0"
 edition = "2021"
 rust-version = "1.60"
 authors = ["Robin Mueller <muellerr@irs.uni-stuttgart.de>"]