diff --git a/tools/esp8266/defines.h b/tools/esp8266/defines.h
index 47d92444..36c2cede 100644
--- a/tools/esp8266/defines.h
+++ b/tools/esp8266/defines.h
@@ -13,7 +13,7 @@
 //-------------------------------------
 #define VERSION_MAJOR       0
 #define VERSION_MINOR       5
-#define VERSION_PATCH       20
+#define VERSION_PATCH       21
 
 
 //-------------------------------------