diff --git a/CHANGELOG.md b/CHANGELOG.md
index dd13c99..c02db25 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog][keep-a-changelog], and this project adheres to [Semantic Versioning][semantic-versioning].
 
 ## [Unreleased]
+
+## [0.4.0] - 2023-08-10
 ### Changed
 - Breaking API changes: `Modem` now uses a `context.Context` which must be passed during creation.
 - Breaking API changes: extract `Stream` for `io.Reader` and `io.Writer` operations out of `Modem`.
@@ -65,7 +67,8 @@ First release
 [keep-a-changelog]: https://keepachangelog.com/en/1.1.0/
 [semantic-versioning]: https://semver.org/spec/v2.0.0.html
 
-[unreleased]: https://github.com/dtn7/rf95modem-go/compare/v0.3.2...HEAD
+[unreleased]: https://github.com/dtn7/rf95modem-go/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/dtn7/rf95modem-go/compare/v0.3.2...v0.4.0
 [0.3.2]: https://github.com/dtn7/rf95modem-go/compare/v0.3.1...v0.3.2
 [0.3.1]: https://github.com/dtn7/rf95modem-go/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/dtn7/rf95modem-go/compare/v0.2.0...v0.3.0
diff --git a/README.md b/README.md
index c5fe7e4..47a3a23 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 
 Golang library to send and receive data over LoRa PHY via a serial connection to a [rf95modem].
 
-This library was tested against the rf95modem commit [`117878a`][rf95modem-commit], slightly after version 0.7.3 including [patch #16][rf95modem-pr16].
+This library was tested against the rf95modem commit [`8f163aa`][rf95modem-commit], slightly after version 0.7.3.
 
 
 ## Library
@@ -166,5 +166,4 @@ $ screen /dev/pts/7
 
 [godoc]: https://pkg.go.dev/github.com/dtn7/rf95modem-go/rf95
 [rf95modem]: https://github.com/gh0st42/rf95modem
-[rf95modem-commit]: https://github.com/gh0st42/rf95modem/commit/117878a4b609f9488ad8d5176f98067b9e8baa01
-[rf95modem-pr16]: https://github.com/gh0st42/rf95modem/pull/16
+[rf95modem-commit]: https://github.com/gh0st42/rf95modem/commit/8f163aa23e6f0c1ca7403c13b0811366e40b7317