diff --git a/ccflow/__init__.py b/ccflow/__init__.py
index 1f6240f..234345d 100644
--- a/ccflow/__init__.py
+++ b/ccflow/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.3.1"
+__version__ = "0.4.0"
 
 from .arrow import *
 from .base import *
diff --git a/pyproject.toml b/pyproject.toml
index 37a80ed..3d2b962 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "hatchling.build"
 [project]
 name = "ccflow"
 description = "Composable Configuration Flow"
-version = "0.3.1"
+version = "0.4.0"
 readme = "README.md"
 license = { file = "LICENSE" }
 requires-python = ">=3.9"
@@ -97,7 +97,7 @@ Repository = "https://github.com/point72/ccflow"
 Homepage = "https://github.com/point72/ccflow"
 
 [tool.bumpversion]
-current_version = "0.3.1"
+current_version = "0.4.0"
 commit = true
 tag = false
 commit_args = "-s"