diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e620d89c..716bfff7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,10 @@
 image: debian:latest
 
 before_script:
-- apt-get update && 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 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
+
 - pip install jupyter-book
 
 pages: