diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index fd3b9e2..9ef71ee 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,7 +2,7 @@ before_script:
     - >
       apt-get update -qq && apt-get install -y -qq iptables-dev libevent-dev
       libnfnetlink-dev uuid-dev make gcc gcc-mingw-w64-i686 mingw-w64-tools
-      libnftnl-dev libmnl-dev libssl-dev net-tools
+      libnftnl-dev libmnl-dev libssl-dev net-tools doxygen graphviz
 
 stages:
     - build
diff --git a/.travis.yml b/.travis.yml
index 806ce45..c76d825 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,8 @@ addons:
     - libnftnl-dev
     - uuid-dev
     - cmake
+    - doxygen
+    - graphviz
 
 # container-based builds
 sudo: false