diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 74a6a3d..384760e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ image: tianon/latex
 
 before_script:
     - apt-get update
-    - apt-get install -y build-essential
+    - apt-get install -y build-essential poppler-utils
 build:
   script:
     - make