diff --git a/CHANGES.md b/CHANGES.md
index 397e20e..23091d8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -8,6 +8,12 @@
 > - Fixed: 🐛
 > - Security: 🛡
 
+## Version 0.4.0
+
+### Added
+
+➕ Added support for extracting `.tar.xz` source archives, in addition to `.tar.gz` and `.zip` archives.
+
 ## Version 0.3.0
 
 ### Added
diff --git a/setup.py b/setup.py
index 9c91005..c164695 100644
--- a/setup.py
+++ b/setup.py
@@ -5,10 +5,10 @@
 
 setuptools.setup(
     name="mussels",
-    version="0.3.0",
+    version="0.4.0",
     author="Micah Snyder",
     author_email="micasnyd@cisco.com",
-    copyright="Copyright (C) 2021 Cisco Systems, Inc. and/or its affiliates. All rights reserved.",
+    copyright="Copyright (C) 2023 Cisco Systems, Inc. and/or its affiliates. All rights reserved.",
     description="Mussels Dependency Build Automation Tool",
     long_description=long_description,
     long_description_content_type="text/markdown",