diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f739b4f4..43452e922 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ The major version bump is due to upping the required PHP version from `8.1` to `
 * It is now possible to customize how JSON request bodies are decoded using the following methods:
 	- `Body::setJsonMaxDepth()` to set the maximum JSON nesting level.
 	- `Body::setJsonFlags()` to set the JSON decoding options.
+* Added `Deprecated` middleware that allows you to easily set the `Deprecation` and `Sunset` HTTP headers.
 
 #### Improvements
 
diff --git a/src/mako/http/routing/middleware/Deprecated.php b/src/mako/http/routing/middleware/Deprecated.php
new file mode 100644
index 000000000..6f10be039
--- /dev/null
+++ b/src/mako/http/routing/middleware/Deprecated.php
@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * @copyright Frederic G. Østby
+ * @license   http://www.makoframework.com/license
+ */
+
+namespace mako\http\routing\middleware;
+
+use Closure;
+use DateTime;
+use DateTimeInterface;
+use mako\http\Request;
+use mako\http\Response;
+use RuntimeException;
+
+class Deprecated implements MiddlewareInterface
+{
+	/**
+	 * Deprecation date.
+	 */
+	protected null|DateTimeInterface $deprecationDate = null;
+
+	/**
+	 * Sunset date.
+	 */
+	protected null|DateTimeInterface $sunsetDate = null;
+
+	/**
+	 * Constructor.
+	 */
+	public function __construct(null|DateTimeInterface|string $deprecationDate = null, null|DateTimeInterface|string $sunsetDate = null)
+	{
+		if ($deprecationDate === null && $sunsetDate === null) {
+			throw new RuntimeException('You must specify either a deprecation date or a sunset date or both.');
+		}
+
+		if ($deprecationDate !== null) {
+			$this->deprecationDate = $deprecationDate instanceof DateTimeInterface ? $deprecationDate : new DateTime($deprecationDate);
+		}
+
+		if ($sunsetDate !== null) {
+			$this->sunsetDate = $sunsetDate instanceof DateTimeInterface ? $sunsetDate : new DateTime($sunsetDate);
+		}
+
+		if ($deprecationDate !== null && $sunsetDate !== null && $this->deprecationDate->getTimestamp() >= $this->sunsetDate->getTimestamp()) {
+			throw new RuntimeException('The deprecation date must be earlier than the sunset date.');
+		}
+	}
+	/**
+	 * {@inheritDoc}
+	 */
+	public function execute(Request $request, Response $response, Closure $next): Response
+	{
+		if ($this->deprecationDate !== null) {
+			$response->headers->add('Deprecation', "@{$this->deprecationDate->getTimestamp()}");
+		}
+
+		if ($this->sunsetDate !== null) {
+			$response->headers->add('Sunset', $this->sunsetDate->format(DateTime::RFC7231));
+		}
+
+		return $next($request, $response);
+	}
+}
diff --git a/tests/unit/http/routing/middleware/DeprecatedTest.php b/tests/unit/http/routing/middleware/DeprecatedTest.php
new file mode 100644
index 000000000..3f66cb465
--- /dev/null
+++ b/tests/unit/http/routing/middleware/DeprecatedTest.php
@@ -0,0 +1,119 @@
+<?php
+
+/**
+ * @copyright Frederic G. Østby
+ * @license   http://www.makoframework.com/license
+ */
+
+namespace mako\tests\unit\http\routing\middleware;
+
+use mako\http\Request;
+use mako\http\Response;
+use mako\http\response\Headers;
+use mako\http\routing\middleware\Deprecated;
+use mako\tests\TestCase;
+use Mockery;
+
+/**
+ * @group unit
+ */
+class DeprecatedTest extends TestCase
+{
+	/**
+	 *
+	 */
+	public function testConstructorWithoutArgs(): void
+	{
+		$this->expectExceptionMessage('You must specify either a deprecation date or a sunset date or both.');
+
+		new Deprecated;
+	}
+
+	/**
+	 *
+	 */
+	public function testConstructorWithSunsetBeforeDeprecation(): void
+	{
+		$this->expectExceptionMessage('The deprecation date must be earlier than the sunset date.');
+
+		new Deprecated('2021-02-01', '2020-01-01');
+	}
+
+	/**
+	 *
+	 */
+	public function testDeprecatedWithDeprecationDate(): void
+	{
+		$middleware = new Deprecated('2021-02-01');
+
+		/** @var \mako\http\Request|\Mockery\MockInterface $request */
+		$request = Mockery::mock(Request::class);
+
+		/** @var \mako\http\Response|\Mockery\MockInterface $response */
+		$response = Mockery::mock(Response::class);
+
+		/** @var \mako\http\response\Headers|\Mockery\MockInterface $headers */
+		$headers = Mockery::mock(Headers::class);
+
+		(function () use ($headers): void {
+			$this->headers = $headers;
+		})->bindTo($response, Response::class)();
+
+		$headers->shouldReceive('add')->once()->with('Deprecation', '@1612137600');
+
+		$middleware->execute($request, $response, fn ($request, $response) => $response);
+
+	}
+
+	/**
+	 *
+	 */
+	public function testDeprecatedWithSunsetDate(): void
+	{
+		$middleware = new Deprecated(null, '2021-02-01');
+
+		/** @var \mako\http\Request|\Mockery\MockInterface $request */
+		$request = Mockery::mock(Request::class);
+
+		/** @var \mako\http\Response|\Mockery\MockInterface $response */
+		$response = Mockery::mock(Response::class);
+
+		/** @var \mako\http\response\Headers|\Mockery\MockInterface $headers */
+		$headers = Mockery::mock(Headers::class);
+
+		(function () use ($headers): void {
+			$this->headers = $headers;
+		})->bindTo($response, Response::class)();
+
+		$headers->shouldReceive('add')->once()->with('Sunset', 'Mon, 01 Feb 2021 00:00:00 GMT');
+
+		$middleware->execute($request, $response, fn ($request, $response) => $response);
+	}
+
+	/**
+	 *
+	 */
+	public function testDeprecatedWithDeprecationAndSunsetDate(): void
+	{
+		$middleware = new Deprecated('2020-01-01', '2021-02-01');
+
+		/** @var \mako\http\Request|\Mockery\MockInterface $request */
+		$request = Mockery::mock(Request::class);
+
+		/** @var \mako\http\Response|\Mockery\MockInterface $response */
+		$response = Mockery::mock(Response::class);
+
+		/** @var \mako\http\response\Headers|\Mockery\MockInterface $headers */
+		$headers = Mockery::mock(Headers::class);
+
+		(function () use ($headers): void {
+			$this->headers = $headers;
+		})->bindTo($response, Response::class)();
+
+		$headers->shouldReceive('add')->once()->with('Deprecation', '@1577836800');
+
+		$headers->shouldReceive('add')->once()->with('Sunset', 'Mon, 01 Feb 2021 00:00:00 GMT');
+
+		$middleware->execute($request, $response, fn ($request, $response) => $response);
+	}
+}