diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c83d5488bb8ccdb2ad14b619b74bf39328d88ab9..e88e0d23c0425f735a7dd0782f2e60ced6f37d18 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,13 +1,8 @@
-image: ubuntu:bionic
+image: corsika/devel:u-18.04
 
 variables:
   GIT_SSL_NO_VERIFY: "1"
 
-before_script:
-  - apt-get update --yes
-  - apt-get install --yes cmake libboost-dev libeigen3-dev python3 gfortran
-  - apt-get install --yes doxygen graphviz
-
 build:
   stage: build
   tags:
@@ -16,7 +11,7 @@ build:
     - mkdir build
     - cd build
     - cmake ..
-    - cmake --build .
+    - cmake --build . -- -j 4 
     - ctest -j4 -V >& test.log
   after_script:
     - cd build