diff --git a/CHANGELOG.md b/CHANGELOG.md
index 061e79f1d..2e762c031 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,15 @@ All notable changes to libre will be documented in this file.
 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).
 
+## [v3.5.1] - 2023-09-12
+
+## What's Changed
+* cmake: fix RELEASE definition for older cmake releases by @sreimers in https://github.com/baresip/re/pull/953
+* ci/build: add release build check by @sreimers in https://github.com/baresip/re/pull/954
+* cmake: fix definitions for older cmake by @sreimers in https://github.com/baresip/re/pull/955
+
+**Full Changelog**: https://github.com/baresip/re/compare/v3.5.0...v3.5.1
+
 ## [v3.5.0] - 2023-09-12
 
 ## What's Changed
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f8560a42a..073e5e6c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@
 cmake_minimum_required(VERSION 3.13)
 
 project(re
-  VERSION 3.5.0
+  VERSION 3.5.1
   LANGUAGES C
   HOMEPAGE_URL https://github.com/baresip/re
   DESCRIPTION "Generic library for real-time communications"
diff --git a/debian/changelog b/debian/changelog
index 1fbb8b2cc..17decc6f4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+libre (3.5.1) unstable; urgency=medium
+
+  * version 3.5.1
+
+ -- Sebastian Reimers <sebastian.reimers@gmail.com>  Tue, 12 Sep 2023 14:00:00 +0200
+
 libre (3.5.0) unstable; urgency=medium
 
   * version 3.5.0
diff --git a/mk/Doxyfile b/mk/Doxyfile
index 305f385b3..dde38601b 100644
--- a/mk/Doxyfile
+++ b/mk/Doxyfile
@@ -4,7 +4,7 @@
 # Project related configuration options
 #---------------------------------------------------------------------------
 PROJECT_NAME           = libre
-PROJECT_NUMBER         = 3.5.0
+PROJECT_NUMBER         = 3.5.1
 OUTPUT_DIRECTORY       = ../re-dox
 CREATE_SUBDIRS         = NO
 OUTPUT_LANGUAGE        = English