diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d4e386..0ff9646 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+# 2021.3.26
+
+- release **v2.3**
+- fix `is_in_position()`
+- refactor process method
+- some methods can be chained
+- add new methods to control pump
+- change `set_led_color(rgb:str)` -> `set_color(r:int, g:int, b:in)`
+
 # 2021.3.12
 
 added more test file.
diff --git a/setup.py b/setup.py
index 81d1cc0..23468df 100755
--- a/setup.py
+++ b/setup.py
@@ -1,16 +1,14 @@
 import sys
 
+VERSION = "2.3"
 
 PYTHON_VERSION = sys.version_info[:2]
-VERSION  = "2.2.1"
-
 if (2, 7) != PYTHON_VERSION < (3, 5):
     print("This mycobot version requires Python2.7, 3.5 or later.")
     sys.exit(1)
 
 import setuptools
 
-
 if PYTHON_VERSION == (2, 7):
     long_description = ""
 else:
@@ -37,6 +35,5 @@
         "Operating System :: OS Independent",
     ],
     install_requires=['pyserial'],
-    python_requires= '>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*',
+    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*',
 )
-