diff --git a/datafog/__about__.py b/datafog/__about__.py
index 88c513ea..3ea38ce6 100644
--- a/datafog/__about__.py
+++ b/datafog/__about__.py
@@ -1 +1 @@
-__version__ = "3.3.0"
+__version__ = "4.1.0-dev"
diff --git a/setup.py b/setup.py
index ffdca1a4..57e88c2a 100644
--- a/setup.py
+++ b/setup.py
@@ -5,7 +5,7 @@
     long_description = f.read()
 
 # Use a single source of truth for the version
-__version__ = "4.0.0"
+__version__ = "4.1.0-dev"
 
 project_urls = {
     "Homepage": "https://datafog.ai",