prepare V3.1.0
diff --git a/serial/__init__.py b/serial/__init__.py
index 9dd7644..2d2237b 100644
--- a/serial/__init__.py
+++ b/serial/__init__.py
@@ -13,7 +13,7 @@
 from serial.serialutil import *
 #~ SerialBase, SerialException, to_bytes, iterbytes
 
-__version__ = '3.1a0'
+__version__ = '3.1'
 
 VERSION = __version__