diff --git a/Dockerfile b/Dockerfile
index 819006bb..312fe0cf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,11 +12,12 @@ RUN apt update -y && apt install python3-pip git -y && pip3 install --no-cache-d
 
 ADD Pipfile Pipfile.lock /httpbin/
 WORKDIR /httpbin
-RUN /bin/bash -c "pip3 install --no-cache-dir -r <(pipenv lock -r)"
+RUN /bin/bash -c "pip3 install --no-cache-dir -r <(pipenv requirements)"
 
 ADD . /httpbin
 RUN pip3 install --no-cache-dir /httpbin
+RUN chmod +x /httpbin/httpbin.bash
 
 EXPOSE 80
 
-CMD ["gunicorn", "-b", "0.0.0.0:80", "httpbin:app", "-k", "gevent"]
+CMD ["/httpbin/httpbin.bash"]
diff --git a/README.md b/README.md
index 8148d684..b951e69a 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,13 @@ docker pull kennethreitz/httpbin
 docker run -p 80:80 kennethreitz/httpbin
 ```
 
+Some enviroments do not allow to bind to a privileged port. To run it on a
+different port instead of port 80, set the environment variables as follows:
+
+```sh
+docker run -e HTTPIN_PORT=8000 -p 8000:8000 kennethreitz/httpbin
+```
+
 See http://httpbin.org for more information.
 
 ## Officially Deployed at:
diff --git a/httpbin.bash b/httpbin.bash
new file mode 100644
index 00000000..6fe976d1
--- /dev/null
+++ b/httpbin.bash
@@ -0,0 +1,5 @@
+#!/bin/bash
+exec gunicorn \
+    -b ${HTTPBIN_HOST:-0.0.0.0}:${HTTPBIN_PORT:-80} \
+    -k gevent \
+    httpbin:app