diff --git a/hal/api/mbed.h b/hal/api/mbed.h
index a5fbb4c9bc..df2c6c762d 100644
--- a/hal/api/mbed.h
+++ b/hal/api/mbed.h
@@ -16,7 +16,7 @@
 #ifndef MBED_H
 #define MBED_H
 
-#define MBED_LIBRARY_VERSION 120
+#define MBED_LIBRARY_VERSION 121
 
 #include "platform.h"