diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index faefe23e..09a04983 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,7 +4,7 @@ before_script:
     - add-apt-repository -y 'deb http://debian.jpleau.ca/ jessie-backports main contrib non-free'
     - apt-get update -qq
     - apt-get install --force-yes -y autoconf automake make libx11-dev libpango1.0-dev libcairo2-dev libstartup-notification0-dev libxcb-icccm4-dev libxcb-util0-dev libxcb-xinerama0-dev libxcb-xkb-dev libx11-xcb-dev
-    - apt-get install --force-yes -y libxcb1-dev xvfb discount xdotool fluxbox libxkbcommon-dev libxkbcommon-x11-dev libxcb-ewmh-dev xutils-dev libtool lcov libxcb-randr0-dev doxygen python
+    - apt-get install --force-yes -y libxcb1-dev xvfb discount xdotool fluxbox libxkbcommon-dev libxkbcommon-x11-dev libxcb-ewmh-dev xutils-dev libtool lcov libxcb-randr0-dev doxygen python flex bison
     - git clone --recursive https://github.com/Airblader/xcb-util-xrm.git
     - cd xcb-util-xrm 
     - ./autogen.sh --prefix=/usr