diff --git a/mongoose.c b/mongoose.c
index 9c4ea570..491fa5f7 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -250,7 +250,7 @@ typedef int SOCKET;
 
 #include "mongoose.h"
 
-#define MONGOOSE_VERSION "3.9"
+#define MONGOOSE_VERSION "4.0"
 #define PASSWORDS_FILE_NAME ".htpasswd"
 #define CGI_ENVIRONMENT_SIZE 4096
 #define MAX_CGI_ENVIR_VARS 64