diff --git a/autodoc_traits/__init__.py b/autodoc_traits/__init__.py
index 73ffbd2..ea6175b 100644
--- a/autodoc_traits/__init__.py
+++ b/autodoc_traits/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.1.0"
+__version__ = "1.0.0.dev"
 
 
 def setup(app, *args, **kwargs):
diff --git a/pyproject.toml b/pyproject.toml
index f0cf252..3b811b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [tool.tbump.version]
-current = "0.1.0"
+current = "1.0.0.dev"
 
 # Example of a pep440 regexp.
 # Make sure this matches current_version before