diff --git a/composer.json b/composer.json
index 94e67869f..3d366c4fc 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
     "php": "~8.1.0",
     "doctrine/dbal": "^3.4.2",
     "psr/cache": "^2.0.0|^3.0.0",
+    "psr/clock": "^1.0",
     "psr/log": "^2.0.0|^3.0.0",
     "psr/simple-cache": "^2.0.0|^3.0.0",
     "symfony/console": "^5.4.1|^6.0.1",
diff --git a/composer.lock b/composer.lock
index 07706667c..a69f10e49 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "e31c22c41617409f8ac2de2229b46bf2",
+    "content-hash": "9c67971791afc85eb133c6de106862ad",
     "packages": [
         {
             "name": "doctrine/cache",
@@ -394,6 +394,54 @@
             },
             "time": "2021-02-03T23:26:27+00:00"
         },
+        {
+            "name": "psr/clock",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-fig/clock.git",
+                "reference": "e41a24703d4560fd0acb709162f73b8adfc3aa0d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-fig/clock/zipball/e41a24703d4560fd0acb709162f73b8adfc3aa0d",
+                "reference": "e41a24703d4560fd0acb709162f73b8adfc3aa0d",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Clock\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
+                }
+            ],
+            "description": "Common interface for reading the clock.",
+            "homepage": "https://github.com/php-fig/clock",
+            "keywords": [
+                "clock",
+                "now",
+                "psr",
+                "psr-20",
+                "time"
+            ],
+            "support": {
+                "issues": "https://github.com/php-fig/clock/issues",
+                "source": "https://github.com/php-fig/clock/tree/1.0.0"
+            },
+            "time": "2022-11-25T14:36:26+00:00"
+        },
         {
             "name": "psr/container",
             "version": "2.0.2",
@@ -7547,5 +7595,5 @@
     "platform-dev": {
         "ext-pdo_sqlite": "~8.1.0"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.2.0"
 }
diff --git a/docs/pages/clock.md b/docs/pages/clock.md
index ff13feabb..09a3dbc9a 100644
--- a/docs/pages/clock.md
+++ b/docs/pages/clock.md
@@ -5,7 +5,7 @@ purposes. We are using this clock to create the `recorded_on` datetime for the e
 
 !!! note
 
-    The `Clock` interface will be PSR-20 compatible as soon at it is published. For more information see [here](https://github.com/php-fig/fig-standards/blob/master/proposed/clock.md).
+    The `Clock` interface is PSR-20 compatible. For more information see [here](https://github.com/php-fig/fig-standards/blob/master/proposed/clock.md).
 
 ## SystemClock
 
diff --git a/src/Clock/Clock.php b/src/Clock/Clock.php
index 3b8da6ca3..ddb52b255 100644
--- a/src/Clock/Clock.php
+++ b/src/Clock/Clock.php
@@ -4,9 +4,8 @@
 
 namespace Patchlevel\EventSourcing\Clock;
 
-use DateTimeImmutable;
+use Psr\Clock\ClockInterface;
 
-interface Clock
+interface Clock extends ClockInterface
 {
-    public function now(): DateTimeImmutable;
 }
diff --git a/src/EventBus/Decorator/RecordedOnDecorator.php b/src/EventBus/Decorator/RecordedOnDecorator.php
index 9f9a2dd47..a9c091f22 100644
--- a/src/EventBus/Decorator/RecordedOnDecorator.php
+++ b/src/EventBus/Decorator/RecordedOnDecorator.php
@@ -4,13 +4,14 @@
 
 namespace Patchlevel\EventSourcing\EventBus\Decorator;
 
-use Patchlevel\EventSourcing\Clock\Clock;
 use Patchlevel\EventSourcing\EventBus\Message;
+use Psr\Clock\ClockInterface;
 
 final class RecordedOnDecorator implements MessageDecorator
 {
-    public function __construct(private readonly Clock $clock)
-    {
+    public function __construct(
+        private readonly ClockInterface $clock
+    ) {
     }
 
     public function __invoke(Message $message): Message