diff --git a/CHANGELOG.md b/CHANGELOG.md
index c8c9172..b9666e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [v0.4.0] - 2021-04-23
 ### Changed
 - update dependencies, including stable tokio this time.
 - migrate error handling to anyhow
diff --git a/Cargo.lock b/Cargo.lock
index 60774b9..0c3cad7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -447,7 +447,7 @@ dependencies = [
 
 [[package]]
 name = "peshming"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anyhow",
  "async-anyhow-logger",
diff --git a/Cargo.toml b/Cargo.toml
index 50edf2f..3f4f08c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "peshming"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Jan Christian Grünhage <jan.christian@gruenhage.xyz>"]
 edition = "2018"
 description = "Pings configured hosts in a configurable intervals and exposes metrics for prometheus."