diff --git a/setup.py b/setup.py
index 002abce3..3e0852b9 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@ from setuptools import find_packages, setup
 
 # When the version is updated, a new section in the CHANGELOG.md file must be
 # added too.
-VERSION = "master"
+VERSION = "3.dev"
 
 with open("README.md", encoding="utf-8") as f:
     long_description = f.read()