diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 835ff78..614d47e 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.3.3
+current_version = 0.4.0
 commit = True
 tag = True
 
diff --git a/README.rst b/README.rst
index d7769f9..c454ac3 100644
--- a/README.rst
+++ b/README.rst
@@ -90,7 +90,7 @@ shippinglabel
 .. |language| image:: https://img.shields.io/github/languages/top/domdfcoding/shippinglabel
 	:alt: GitHub top language
 
-.. |commits-since| image:: https://img.shields.io/github/commits-since/domdfcoding/shippinglabel/v0.3.3
+.. |commits-since| image:: https://img.shields.io/github/commits-since/domdfcoding/shippinglabel/v0.4.0
 	:target: https://github.com/domdfcoding/shippinglabel/pulse
 	:alt: GitHub commits since tagged version
 
diff --git a/__pkginfo__.py b/__pkginfo__.py
index 3867cc4..854739d 100644
--- a/__pkginfo__.py
+++ b/__pkginfo__.py
@@ -26,7 +26,7 @@
 2020 Dominic Davis-Foster <dominic@davis-foster.co.uk>
 """
 
-__version__ = "0.3.3"
+__version__ = "0.4.0"
 
 repo_root = pathlib.Path(__file__).parent
 install_requires = (repo_root / "requirements.txt").read_text(encoding="utf-8").split('\n')
diff --git a/doc-source/index.rst b/doc-source/index.rst
index b781fd2..ae0e573 100644
--- a/doc-source/index.rst
+++ b/doc-source/index.rst
@@ -93,7 +93,7 @@ shippinglabel
 	:alt: GitHub top language
 
 .. |commits-since| github-shield::
-	:commits-since: v0.3.3
+	:commits-since: v0.4.0
 	:alt: GitHub commits since tagged version
 
 .. |commits-latest| github-shield::
diff --git a/repo_helper.yml b/repo_helper.yml
index e06b198..04cd816 100644
--- a/repo_helper.yml
+++ b/repo_helper.yml
@@ -5,7 +5,7 @@ copyright_years: '2020'
 author: 'Dominic Davis-Foster'
 email: 'dominic@davis-foster.co.uk'
 username: 'domdfcoding'
-version: '0.3.3'
+version: '0.4.0'
 license: 'MIT'
 short_desc: 'Utilities for handling packages.'
 
diff --git a/shippinglabel/__init__.py b/shippinglabel/__init__.py
index 3a34715..dc2dfdd 100644
--- a/shippinglabel/__init__.py
+++ b/shippinglabel/__init__.py
@@ -35,7 +35,7 @@
 __author__: str = "Dominic Davis-Foster"
 __copyright__: str = "2020 Dominic Davis-Foster"
 __license__: str = "MIT License"
-__version__: str = "0.3.3"
+__version__: str = "0.4.0"
 __email__: str = "dominic@davis-foster.co.uk"
 
 
@@ -71,7 +71,7 @@ def normalize_keep_dot(name: str) -> str:
 
 	:param name: The project name.
 
-	.. versionadded:: 0.3.3
+	.. versionadded:: 0.4.0
 	"""
 
 	return _normalize_keep_dot_pattern.sub('-', name).lower()