diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a638dcf..dc7e8e8 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,9 +4,10 @@ image: ubuntu:trusty
 
 pages:
   script:
-  - apk update
-  - apl add graphviz
-  - apk add doxygen
+    - export DEBIAN_FRONTEND=noninteractive
+    - apt-get -yq update
+    - apt-get -yq install graphviz
+    - apt-get -yq install doxygen
   - doxygen Doku/Doxygen/Doxyfile
   - mv Doku/Doxygen/html/ public/
   artifacts: