diff --git a/bindings/python/py_src/tokenizers/__init__.py b/bindings/python/py_src/tokenizers/__init__.py
index 9a1d8a8c..c4ba61ce 100644
--- a/bindings/python/py_src/tokenizers/__init__.py
+++ b/bindings/python/py_src/tokenizers/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.12.1"
+__version__ = "0.12.1.dev0"
 
 from typing import Tuple, Union, Tuple, List
 from enum import Enum
diff --git a/bindings/python/setup.py b/bindings/python/setup.py
index b4166c23..f3744ee6 100644
--- a/bindings/python/setup.py
+++ b/bindings/python/setup.py
@@ -8,7 +8,7 @@ extras["dev"] = extras["testing"]
 
 setup(
     name="tokenizers",
-    version="0.12.1",
+    version="0.12.1.dev0",
     description="Fast and Customizable Tokenizers",
     long_description=open("README.md", "r", encoding="utf-8").read(),
     long_description_content_type="text/markdown",