diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f265c877e777efb1179cca4f77566428160f5205..261f80bc4bb421d249af22ef5748e01800433e66 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -7,7 +7,7 @@ pages:
   stage: deploy
 
   script:
-    - pip3 install rst2html5 jupyter
+    - pip3 install rst2html5 jupyter nbconvert==5.6.1
     - make presentations
     - mkdir .public
     - cp ipynb/*.html .public