diff --git a/nix/sources.json b/nix/sources.json
index 2c75064..5163371 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -17,6 +17,12 @@
         "url": "https://github.com/nix-community/home-manager/archive/2aa20ae969f2597c4df10a094440a66e9d7f8c86.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "mumble-website": {
+        "branch": "master",
+        "repo": "https://gitlab.infra4future.de/hacc/infra4future/mumble.infra4future.de.git",
+        "rev": "3a70bf8aa1f4bb56524d36153b84cfb538c4f787",
+        "type": "git"
+    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",