diff --git a/Dockerfile b/Dockerfile
index 11d6f08..7708fec 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,8 +3,10 @@ FROM alpine:latest
 RUN apk add --no-cache nginx python3 py3-virtualenv
 
 RUN python3 -m venv /venv
-RUN /venv/bin/pip install -U pip certbot certbot-nginx
+RUN /venv/bin/pip install certbot certbot-nginx
+ENV PATH="/venv/bin:$PATH"
 
+RUN /venv/bin/pip cache purge && /venv/bin/pip uninstall -y pip
 RUN apk del py3-virtualenv && rm -rf /var/cache/apk
 
 COPY ./run.sh /