diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dbc301f0..00f43a7b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,8 +7,7 @@ before_script:
 - apt-get install -y python3-sphinx && apt-get clean
 - apt-get install -y jupyter-notebook && apt-get clean
 - apt-get install -y python3-anyio python3-greenlet python3-click python3-jupyter-server python3-sqlalchemy python3-latexcodec python3-nbclient python3-nest-asyncio python3-pybtex python3-pybtex-docutils python3-smmap python3-soupsieve python3-toml && apt-get clean
-
-- pip install jupyter-book
+- pip install jupyter-book && pip cache purge
 
 pages:
   stage: deploy
diff --git a/Dockerfile b/Dockerfile
index 18d74d62..881da6a2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 FROM debian:latest
 
 RUN apt-get update
-RUN apt-get install -y pip python3-sphinx jupyter-notebook python3-anyio python3-greenlet python3-click python3-jupyter-server python3-sqlalchemy python3-latexcodec python3-nbclient python3-nest-asyncio python3-pybtex python3-pybtex-docutils python3-smmap python3-soupsieve python3-toml 
-RUN pip install jupyter-book
+RUN apt-get install -y pip python3-sphinx jupyter-notebook python3-anyio python3-greenlet python3-click python3-jupyter-server python3-sqlalchemy python3-latexcodec python3-nbclient python3-nest-asyncio python3-pybtex python3-pybtex-docutils python3-smmap python3-soupsieve python3-toml && apt-get clean
+RUN pip install jupyter-book && pip cache purge
 
 RUN mkdir -p /root/documentation
 COPY * /root/documentation