diff --git a/setup.py b/setup.py
index ab46e64..3704746 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name="regcore",
-    version="3.1.0",
+    version="4.0.0",
     license="public domain",
     packages=find_packages(),
     include_package_data=True,