diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0a7680e57..7b1aa557e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 For more detailed information about the changes see the history of the
 [repository](https://github.com/votca/csg/commits/master).
 
-## Version 1.6.4 (released XX.12.20)
+## Version 1.6.4 (released 12.01.21)
 * fix exclusion creation in csg_boltzmann (#624, #625)
 
 ## Version 1.6.3 (released 09.12.20)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index eb02f13908..db30313906 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.10)
 
 project(votca-csg)
 
-set(PROJECT_VERSION "1.6.3")
+set(PROJECT_VERSION "1.6.4")
 set(PROJECT_CONTACT "bugs@votca.org")
 string(REGEX REPLACE "^[1-9]+\\.([1-9]+).*$" "\\1" SOVERSION "${PROJECT_VERSION}")
 if (NOT ${SOVERSION} MATCHES "[1-9]+")