diff --git a/src/main/cpp/CImg.h b/src/main/cpp/CImg.h
index 3b65685..8445df9 100644
--- a/src/main/cpp/CImg.h
+++ b/src/main/cpp/CImg.h
@@ -54,7 +54,7 @@
 
 // Set version number of the library.
 #ifndef cimg_version
-#define cimg_version 230
+#define cimg_version 231
 
 /*-----------------------------------------------------------
  #