diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f1cb60..c18fda4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # ChangeLog for pymycobot
 
+## v3.1.1 (2023-06-14)
+
+- release v3.1.1
+- Add new interface: set_gservo_round()
+
 ## v3.1.0 (2023-06-09)
 
 - release v3.1.0
diff --git a/pymycobot/__init__.py b/pymycobot/__init__.py
index fb3fac4..b006214 100644
--- a/pymycobot/__init__.py
+++ b/pymycobot/__init__.py
@@ -42,7 +42,7 @@
     from pymycobot.mybuddyemoticon import MyBuddyEmoticon
     __all__.append("MyBuddyEmoticon")
 
-__version__ = "3.1.0"
+__version__ = "3.1.1"
 __author__ = "Elephantrobotics"
 __email__ = "weiquan.xu@elephantrobotics.com"
 __git_url__ = "https://github.com/elephantrobotics/pymycobot"