diff --git a/Dockerfile b/Dockerfile
index 6a2ba5d..ca12eca 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,9 +14,13 @@ RUN \
   yarn build
 
 FROM nginx:alpine
-RUN apk add --no-cache bash
 COPY --from=build-env /opt/app/build /var/www
-COPY --from=build-env /opt/app/default.conf /etc/nginx/conf.d/default.conf
+COPY --from=build-env /opt/app/envsubt.sh /etc/nginx/templates/envsubt.sh
+COPY --from=build-env /opt/app/default.conf /etc/nginx/templates/default.conf.template
 WORKDIR /var/www
-EXPOSE 80 5000
-CMD ["/bin/bash", "-c", "nginx -g \"daemon off;\""]
+
+RUN apk add --no-cache bash
+
+ENV PORT=80
+
+CMD ["/bin/sh", "-c", "/etc/nginx/templates/envsubt.sh && nginx -g \"daemon off;\""]
diff --git a/default.conf b/default.conf
index 874edf4..973b036 100644
--- a/default.conf
+++ b/default.conf
@@ -1,5 +1,5 @@
 server {                                              
-   listen       80;                                  
+   listen       ${PORT};
    server_name  localhost;                         
    #charset koi8-r;                                  
    #access_log  /var/log/nginx/host.access.log  main;        
diff --git a/envsubt.sh b/envsubt.sh
new file mode 100755
index 0000000..a21eebb
--- /dev/null
+++ b/envsubt.sh
@@ -0,0 +1 @@
+envsubst '\${PORT}' < /etc/nginx/templates/default.conf.template > /etc/nginx/conf.d/default.conf
\ No newline at end of file