diff --git a/docker-compose.yml b/docker-compose.yml
index 8af2ab1..72f1b2b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,6 +15,10 @@ services:
       disable: true
 
   excalidraw-room:
-    image: excalidraw/excalidraw-room:latest
+    build:
+      context: ./excalidraw-room
+    environment:
+      # Collaboration WebSocket
+      PORT: 3002
     ports:
-      - '8802:80'
+      - '8802:3002'
diff --git a/excalidraw-room b/excalidraw-room
new file mode 160000
index 0000000..03ff435
--- /dev/null
+++ b/excalidraw-room
@@ -0,0 +1 @@
+Subproject commit 03ff435860b508d7cd9e005cfc90f7977ae2a593