diff --git a/.all-contributorsrc b/.all-contributorsrc
index 754d15f2..98f3797f 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -54,6 +54,15 @@
         "doc",
         "maintenance"
       ]
+    },
+    {
+      "login": "casperklein",
+      "name": "Casper",
+      "avatar_url": "https://avatars.githubusercontent.com/u/590174?v=4",
+      "profile": "https://www.heiko-barth.de",
+      "contributions": [
+        "maintenance"
+      ]
     }
   ],
   "contributorsPerLine": 7,
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 8d1258c5..51b8692a 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -12,6 +12,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/georglauterbach"><img src="https://avatars.githubusercontent.com/u/44545919?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Georg Lauterbach</b></sub></a><br /><a href="#maintenance-georglauterbach" title="Maintenance">🚧</a> <a href="https://github.com/docker-mailserver/docker-mailserver/commits?author=georglauterbach" title="Code">💻</a> <a href="#question-georglauterbach" title="Answering Questions">💬</a> <a href="https://github.com/docker-mailserver/docker-mailserver/pulls?q=is%3Apr+reviewed-by%3Ageorglauterbach" title="Reviewed Pull Requests">👀</a></td>
     <td align="center"><a href="https://github.com/hnws"><img src="https://avatars.githubusercontent.com/u/668137?v=4?s=100" width="100px;" alt=""/><br /><sub><b>hnws</b></sub></a><br /><a href="https://github.com/docker-mailserver/docker-mailserver/commits?author=hnws" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/wernerfred"><img src="https://avatars.githubusercontent.com/u/20406381?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Frederic Werner</b></sub></a><br /><a href="https://github.com/docker-mailserver/docker-mailserver/commits?author=wernerfred" title="Documentation">📖</a> <a href="#maintenance-wernerfred" title="Maintenance">🚧</a></td>
+    <td align="center"><a href="https://www.heiko-barth.de"><img src="https://avatars.githubusercontent.com/u/590174?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Casper</b></sub></a><br /><a href="#maintenance-casperklein" title="Maintenance">🚧</a></td>
   </tr>
 </table>