diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5dfda99..319c19a 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
+
+## 0.5.1 - 2019-04-16
 ### Changed
 - Use 1-byte alignment on DHCP options.
 - Refer to salsa.debian.org for deb package source.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c0ef426..fe439f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,7 +13,7 @@ else()
 	set(CMAKE_INSTALL_PREFIX /usr CACHE STRING "Choose install prefix")
 endif()
 
-project(dhcpoptinj LANGUAGES C VERSION 0.5.0)
+project(dhcpoptinj LANGUAGES C VERSION 0.5.1)
 add_definitions(-DDHCPOPTINJ_VERSION="${PROJECT_VERSION}")
 set(SOURCES
 	src/config.c