diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5045ddf691ddb7d4d1b34ceafb03ce048f5afd1f..c32bec95b55176710566d8f381f159cec91d6ab1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,6 +8,7 @@ cache:
 
 before_script:
   - npm install gitbook-cli -g # install gitbook
+  - npm install pyyaml
   - gitbook fetch 3.2.3 # fetch final stable version
   - gitbook install # add any requested plugins in book.json
 
@@ -23,7 +24,6 @@ test:
 build:
   stage: build
   script:
-    - npm install pyyaml
     - python make_documents.py
     - pandoc Deliverable_4-8.md -f markdown -t docx -s -o Deliverable_4-8.docx
     - pandoc Deliverable_4-9.md -f markdown -t docx -s -o Deliverable_4-9.docx