diff --git a/CHANGELOG.md b/CHANGELOG.md
index 311cc59..ef4b96e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ Types of changes:
 The project uses semantic versioning.
 
 ## Unreleased
+
+## 0.4.0 (2022-05-08)
 Added:
 * New @retry decorator for retries of coroutine calls.
 
diff --git a/pyproject.toml b/pyproject.toml
index 8354bf4..4fe6d1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool]
 [tool.poetry]
 name = "dike"
-version = "0.3.1"
+version = "0.4.0"
 homepage = "https://github.com/chr1st1ank/dike"
 description = "Python asyncio tools for web service resilience."
 authors = ["Christian Krudewig <chr1st1ank@krudewig-online.de>"]