diff --git a/Grbl_Esp32/src/Grbl.h b/Grbl_Esp32/src/Grbl.h
index f0dbd60d..a6d45cc0 100644
--- a/Grbl_Esp32/src/Grbl.h
+++ b/Grbl_Esp32/src/Grbl.h
@@ -22,7 +22,7 @@
 
 // Grbl versioning system
 const char* const GRBL_VERSION       = "1.3a";
-const char* const GRBL_VERSION_BUILD = "20210424";
+const char* const GRBL_VERSION_BUILD = "20210517";
 
 //#include <sdkconfig.h>
 #include <Arduino.h>