diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4b108c17ad772ec50c182d223a2a9e9b678bd990..ba7222a1869b3c8b1683a5b905575ec5a5bade39 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,7 +26,7 @@ doxygen:
   tags:
     - documentation
   before_script:
-    - apk update && apk --no-cache add git doxygen graphviz ttf-freefont texmf-dist texmf-dist-latexextra texlive texlive-dvi
+    - apk update && apk --no-cache add git doxygen graphviz ttf-freefont texmf-dist texmf-dist-latexextra texlive texlive-dvi openssh
   script:
     # aircraft design
     - git clone --recurse-submodules https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/aircraft-design