diff --git a/mbed.h b/mbed.h
index 77eba34cf6..c45ba7082d 100644
--- a/mbed.h
+++ b/mbed.h
@@ -22,7 +22,7 @@
 // RTOS present, this is valid only for mbed OS 5
 #define MBED_MAJOR_VERSION 5
 #define MBED_MINOR_VERSION 9
-#define MBED_PATCH_VERSION 0
+#define MBED_PATCH_VERSION 1
 
 #else
 // mbed 2