diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc45ce28d1d1ddf8249f9c8f6f21b03042cb6585..abc515455bc010a9ec966c06410e7f749e5719ae 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,6 +10,8 @@ stages:
 build:
   image: openjdk:11
   stage: build
+  before_script:
+    - apt-get update && apt-get -y install graphviz
   script:
     - "./gradlew relast"
     - "./gradlew assemble"