diff --git a/docker/Dockerfile b/docker/Dockerfile
index ea8f1de..c109c90 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,12 +1,12 @@
 FROM ubuntu:latest
 
-ENV PORT "8388"
 ENV METHOD "aes-256-cfb"
-ENV KEY "changeme"
+ENV KEY "Change Me!"
 
-EXPOSE "$PORT"
+ENV PORT 8388
+EXPOSE $PORT
 
-CMD ssserver -p "$PORT" -m "$METHOD" -k "$KEY"
+CMD ssserver -p $PORT -m "$METHOD" -k "$KEY"
 
 RUN apt-get update
 RUN apt-get install -y python-pip