diff --git a/CImg.h b/CImg.h
index 3b65685f9427b5f6d483e5551629eb1aae6ca4f8..8445df9e5294a98e01d2b410c999de3c874c88cf 100644
--- a/CImg.h
+++ b/CImg.h
@@ -54,7 +54,7 @@
 
 // Set version number of the library.
 #ifndef cimg_version
-#define cimg_version 230
+#define cimg_version 231
 
 /*-----------------------------------------------------------
  #