diff --git a/Software/TempSender/TempSender.ino b/Software/TempSender/TempSender.ino
index 9e2c3b0..7bdbfce 100644
--- a/Software/TempSender/TempSender.ino
+++ b/Software/TempSender/TempSender.ino
@@ -21,7 +21,7 @@
 #define ID 1
 #define PROGRAM "TempSender"
 #define VERSION "1.3"
-#define REVISION "2.0"
+#define REVISION "2.1"
 
 #define BTN_INT 3 // button interrupt pin
 #define Max485_RO 2 // read-output of Max485