diff --git a/CMakeLists.txt b/CMakeLists.txt
index 56e58f332..bfe35fcf5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ include(EthPolicy)
 eth_policy()
 
 # project name and version should be set after cmake_policy CMP0048
-set(PROJECT_VERSION "0.5.8")
+set(PROJECT_VERSION "0.5.9")
 project(solidity VERSION ${PROJECT_VERSION} LANGUAGES CXX)
 
 option(LLL "Build LLL" OFF)
diff --git a/Changelog.md b/Changelog.md
index 8ffe5df6b..801a4f2a0 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,16 @@
+### 0.5.9 (unreleased)
+
+Language Features:
+
+
+Compiler Features:
+
+
+Bugfixes:
+
+
+
+
 ### 0.5.8 (2019-04-30)
 
 Important Bugfixes: