diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 208a251af3dcb44810bb6c4379d18856a368049a..f3f35c829bf783b3792abed690afb36f52d3f6aa 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -23,6 +23,7 @@ test:
 build:
   stage: build
   script:
+    - pip 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