diff --git a/Dockerfile b/Dockerfile
index a237002..7e2df5c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,6 @@ FROM alpine:3.5
 WORKDIR /app
 
 COPY . /app
-EXPOSE 8080
 ENV GIN_MODE=release
-CMD ./main
+
+CMD ./main $PORT