diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fab22a4e..65f5d40e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 image: continuumio/miniconda3:latest
 
 before_script:
-- pip install jupyter-book sphinxcontrib_bibtex
+- pip install jupyter-book==0.10.1 sphinxcontrib_bibtex==1.0.0
 
 pages:
   stage: deploy