diff --git a/deployment/docker-compose.yml b/deployment/docker-compose.yml
index ba57288..40ea6fc 100644
--- a/deployment/docker-compose.yml
+++ b/deployment/docker-compose.yml
@@ -5,8 +5,6 @@ services:
       context: ..
     environment:
       PORT: 8300
-    ports:
-      - "8300:8300"
     volumes:
       - "data:/app/data"
     develop:
@@ -16,6 +14,8 @@ services:
           target: /app
         - action: rebuild
           path: ../backend/requirements.txt
+    networks:
+      - main
 
   frontend:
     build: 
@@ -37,7 +37,15 @@ services:
           target: /server/server.js
         - action: rebuild
           path: package.json
+    networks:
+      - main
+      - default
 
 volumes:
   data:
-    name: fromchat-data
\ No newline at end of file
+    name: fromchat-data
+
+networks:
+  main:
+    driver: bridge
+    internal: true # isolate from the outside world
\ No newline at end of file
diff --git a/deployment/frontend/Dockerfile b/deployment/frontend/Dockerfile
index b2cd175..6e767d9 100644
--- a/deployment/frontend/Dockerfile
+++ b/deployment/frontend/Dockerfile
@@ -26,13 +26,21 @@ COPY deployment/frontend/ .
 # 3. Put it all together
 FROM node:24-slim
 
+# 3.1. Non-root user
+RUN useradd -u 1001 app && \
+    mkdir -p /app && \
+    chown -R app /app && \
+    mkdir /server && \
+    chown -R app /server
+USER app
+
 # 3.1. Frontend static files
 WORKDIR /app
-COPY --from=frontend /app/frontend/dist .
+COPY --from=frontend --chown=app /app/frontend/dist .
 
 # 3.2. Static file server
 WORKDIR /server
-COPY --from=server /server .
+COPY --from=server --chown=app /server .
 
 # 4. Final command
 ENV STATIC_FILE_PATH=/app