diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6df7ed09a088452955ac736d2f21729ad6810fb3..532b4e5eb15359acd7d120e0d49fe3b66836165b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,6 +4,7 @@ test-centos7:
   script:
   - yum install -y epel-release
   - yum install install -y python34-pip python34-devel
+  - yum install graphviz graphviz-devel
   - cd ippisite
   - pip3 install -r requirements.txt
   - python3 manage.py test
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