diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 716bfff7..733f0f24 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,8 +2,11 @@ image: debian:latest
 
 before_script:
 - apt-get update
-- apt-get install -y ca-certificates 
-- 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 install -y ca-certificates && apt-get clean
+- apt-get install -y pip && apt-get clean
+- 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
 
 - pip install jupyter-book