diff --git a/.docker/Dockerfile b/.docker/Dockerfile
index 3309c5805e..e687156f9f 100644
--- a/.docker/Dockerfile
+++ b/.docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM rust:1.37-buster as builder
+FROM rust:1.39-buster as builder
 
 WORKDIR /src
 # Only copy the actual source code over, avoids rebuilds if other stuff changes in the repository
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c50cf011c2..53cdd1c615 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@ 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]
+
+## [0.4.0] - 2019-11-26
+
 ### Changed
 - **Breaking (HTTP+COMIT API):** Change the identity for the Bitcoin Ledger from a public key hash to a public key. This change impacts the HTTP and the COMIT API of cnd.
 - **Breaking (COMIT API):**  Replace Ethereum `network` with Ethereum `chain_id`
@@ -45,7 +48,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Move config files to standard location based on platform (OSX, Windows, Linux).
 - Align implementation with RFC-002 to use the decision header instead of status codes.
 
-[Unreleased]: https://github.com/comit-network/comit-rs/compare/0.3.0...HEAD
+[Unreleased]: https://github.com/comit-network/comit-rs/compare/0.4.0...HEAD
+[0.4.0]: https://github.com/comit-network/comit-rs/compare/0.3.0...0.4.0
 [0.3.0]: https://github.com/comit-network/comit-rs/compare/0.2.1...0.3.0
 [0.2.1]: https://github.com/comit-network/comit-rs/compare/0.2.0...0.2.1
 [0.2.0]: https://github.com/comit-network/comit-rs/compare/b2dd02a7f93dc82f5cc9fd4b6eaaf54de1459ff6...40116c3e8a9f57a213661917b8cc057e1db60755
diff --git a/Cargo.lock b/Cargo.lock
index f593941885..26619985c2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -461,7 +461,7 @@ dependencies = [
 
 [[package]]
 name = "cnd"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "anyhow 1.0.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/cnd/Cargo.toml b/cnd/Cargo.toml
index 04b67d5e8e..68e763e8b9 100644
--- a/cnd/Cargo.toml
+++ b/cnd/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 authors = ["CoBloX developers <team@coblox.tech>"]
 name = "cnd"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2018"
 description = "Reference implementation of a COMIT network daemon."