diff --git a/app.py b/app.py
index 15b9ad6..1465716 100755
--- a/app.py
+++ b/app.py
@@ -10,7 +10,7 @@ from minimalmodbus import Instrument, MODE_RTU
 import sys
 import time
 
-VERSION = '0.1.0'
+VERSION = '0.2.0'
 UNIT = 16
 
 MODBUS_FC_READ_SINGLE_COIL = int("0x01", 16)
@@ -77,7 +77,7 @@ def run():
 	# 										help='set to parallel mode, parameter is the unit id, can be used multiple times')
 
 	parser.add_argument('-q', '--quiet', action='store_true', help='quiet mode, suppress all output')
-
+	parser.add_argument('-v', '--version', action='version', version=f'%(prog)s {VERSION}')
 	args = parser.parse_args()
 
 	instrument = Instrument(port=args.port, mode=MODE_RTU, slaveaddress=UNIT, debug=not args.quiet)
diff --git a/pyproject.toml b/pyproject.toml
index df608f1..8a2adaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "xnergy-example"
-version = "0.1.0"
+version = "0.2.0"
 description = "An example for Xnergy charger"
 authors = ["longqi <longqi90@gmail.com>"]
 readme = "README.md"