diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 46f85288868a2cbba17050e64febfe0cb43b85f4..3ab5f89a4ba8aa7ec52b9fff9b34f2504bed018c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,10 +1,10 @@
 image: python:3.8
-
 pages:
     script:
         - apt update && apt install git -y
         - pip install mkdocs
         - pip install mkdocs-material
+        - pip install plantuml-markdown
         - git clone https://github.com/g-provost/lightgallery-markdown.git
         - cd lightgallery-markdown
         - python setup.py install
@@ -15,4 +15,4 @@ pages:
         paths:
             - public
     tags:
-        - general
\ No newline at end of file
+        - general