diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a4a3fb71a4156009b76591de08624e9e758a1a48..5241c15e540e383e672adf59090d836e9e84de34 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -286,6 +286,7 @@ pages:
   script:
     - export PATH=$PATH:/home/ewsmanager/.local/bin
     - pip install sphinx
+    - pip install sphinx_rtd_theme
     - cd $CI_PROJECT_DIR/docs
     - make html
     - mkdir $CI_PROJECT_DIR/public