diff --git a/mongoose.h b/mongoose.h
index 3f54a892..a14282b1 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -20,7 +20,7 @@
 #ifndef MONGOOSE_HEADER_INCLUDED
 #define  MONGOOSE_HEADER_INCLUDED
 
-#define MONGOOSE_VERSION "5.0"
+#define MONGOOSE_VERSION "5.1"
 
 #include <stdio.h>      // required for FILE
 #include <stddef.h>     // required for size_t