diff --git a/Dockerfile b/Dockerfile
index d32a01c..cff3dd4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,5 +7,5 @@ COPY . /usr/src/app
 RUN npm install -g @angular/cli
 
 RUN npm install
-
+EXPOSE 4200
 CMD ["sh", "-c", "ng serve --configuration=${ANGULAR_CONFIG:-development}"]