diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..b7772ec
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,12 @@
+# Domyślny port aplikacji
+APP_PORT=8000
+
+# Klucz bezpieczeństwa Flask
+SECRET_KEY=supersekretnyklucz123
+
+# Hasło główne do systemu
+SYSTEM_PASSWORD=admin
+
+# Domyślny admin (login i hasło)
+DEFAULT_ADMIN_USERNAME=admin
+DEFAULT_ADMIN_PASSWORD=admin123
diff --git a/docker-compose.yml b/docker-compose.yml
index f6f116d..1fb5e5b 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,14 +3,13 @@ services:
     build: .
     container_name: live-lista-zakupow
     ports:
-      - "8000:8000"
+      - "${APP_PORT:-8000}:8000"
     environment:
       - FLASK_APP=app.py
       - FLASK_ENV=production
-      - SECRET_KEY=supersekretnyklucz
-      - SYSTEM_PASSWORD=admin
-      - DEFAULT_ADMIN_USERNAME=admin
-      - DEFAULT_ADMIN_PASSWORD=admin123
+      - SECRET_KEY=${SECRET_KEY}
+      - SYSTEM_PASSWORD=${SYSTEM_PASSWORD}
+      - DEFAULT_ADMIN_USERNAME=${DEFAULT_ADMIN_USERNAME}
+      - DEFAULT_ADMIN_PASSWORD=${DEFAULT_ADMIN_PASSWORD}
     volumes:
       - .:/app
-    command: flask run --host=0.0.0.0 --port=8000