diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62705be64..c1adfdbd2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@ cmake_minimum_required(VERSION 3.9)
 # Setup the XTB Project
 project(
   "xtb"
-  VERSION "6.6.0"
+  VERSION "6.6.1"
   LANGUAGES "C" "Fortran"
 )
 enable_testing()
diff --git a/meson.build b/meson.build
index c121f1e7b..7e0bd332a 100644
--- a/meson.build
+++ b/meson.build
@@ -19,7 +19,7 @@
 project(
   'xtb',
   'fortran', 'c',
-  version: '6.6.0',
+  version: '6.6.1',
   license: 'LGPL3-3.0-or-later',
   meson_version: '>=0.62.0',
   default_options: [