diff --git a/api/ArduinoAPI.h b/api/ArduinoAPI.h
index eae69497..ce06e881 100644
--- a/api/ArduinoAPI.h
+++ b/api/ArduinoAPI.h
@@ -20,8 +20,8 @@
 #ifndef ARDUINO_API_H
 #define ARDUINO_API_H
 
-// version 1.5.0
-#define ARDUINO_API_VERSION 10500
+// version 1.5.1
+#define ARDUINO_API_VERSION 10501
 
 #include "Binary.h"