diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7243eb4..4937ef9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.1.0 FATAL_ERROR)
 cmake_policy(VERSION 3.1.0)
 
-project (photospline VERSION 2.3.0 LANGUAGES C CXX)
+project (photospline VERSION 2.3.1 LANGUAGES C CXX)
 
 SET(CMAKE_CXX_STANDARD 11)
 SET(CMAKE_C_STANDARD 99)