diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4c9267c..6c3e5bc 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -25,6 +25,7 @@ jupyter-build:
     - main
   script:
     - pip install -r requirements.txt
+    - jupyter-book clean book/
     - jupyter-book build book/
   artifacts:
     paths: