diff --git a/CHANGELOG.md b/CHANGELOG.md
index d88e135..731d170 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,11 @@
+## 4.2.0 (2026-03-05)
+
+Deprecation:
+
+- Delighted is being sunset on June 30, 2026. This is the final release.
+  The package is now marked as inactive and will no longer be maintained.
+  See https://help.delighted.com/article/840-delighted-sunset-faq
+
 ## 4.1.0 (2021-05-12)
 
 Features:
diff --git a/README.md b/README.md
index 12c31d7..8460122 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+> **DEPRECATION NOTICE:** Delighted is being sunset on June 30, 2026. This package is deprecated and will no longer be maintained or receive updates. For more information, visit the [Delighted Sunset FAQ](https://help.delighted.com/article/840-delighted-sunset-faq).
+
+---
+
 [![Build Status](https://travis-ci.org/delighted/delighted-python.svg?branch=master)](https://travis-ci.org/delighted/delighted-python)
 
 # Delighted API Python Client
diff --git a/delighted/__init__.py b/delighted/__init__.py
index f16662d..aa6a086 100644
--- a/delighted/__init__.py
+++ b/delighted/__init__.py
@@ -1,8 +1,18 @@
 __title__ = 'delighted'
-__version__ = '4.1.0'
+__version__ = '4.2.0'
 __author__ = 'Ben Turner'
 __license__ = 'MIT'
 
+import warnings
+warnings.warn(
+    "Delighted is being sunset on June 30, 2026. This package is deprecated "
+    "and will no longer be maintained or receive updates. For more "
+    "information, visit the Delighted Sunset FAQ: "
+    "https://help.delighted.com/article/840-delighted-sunset-faq",
+    FutureWarning,
+    stacklevel=2,
+)
+
 from delighted.http_adapter import HTTPAdapter  # noqa
 
 api_key = None
diff --git a/setup.py b/setup.py
index 3a38bd2..f614b44 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
     long_description_content_type='text/markdown',
     long_description=open('README.md').read(),
     author='Ben Turner, Robby Colvin',
-    author_email='ben@delighted.com',
+    author_email='hello@delighted.com',
     url='https://delighted.com/',
     packages=['delighted'],
     package_dir={'delighted': 'delighted'},
@@ -28,7 +28,7 @@
     test_requires=['mock', 'pytz', 'tzlocal'],
     license='MIT',
     classifiers=[
-        'Development Status :: 5 - Production/Stable',
+        'Development Status :: 7 - Inactive',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: MIT License',
         'Natural Language :: English',