diff --git a/setup.py.legacy b/setup.py.legacy
index 727b0225..7d9afa84 100644
--- a/setup.py.legacy
+++ b/setup.py.legacy
@@ -21,7 +21,7 @@ from setuptools import find_packages, setup
 
 # When the version is updated, a new section in the CHANGELOG.md file must be
 # added too.
-VERSION = "3.7.6"
+VERSION = "3.7.7.dev"
 
 with open("README.md", encoding="utf-8") as f:
     long_description = f.read()