diff --git a/.drone.yml b/.drone.yml
index dd04528..b870e48 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -10,7 +10,7 @@ pipeline:
   build:
     image: jpbernius/pandoc
     commands:
-      - apt-get update && apt-get -y install make
+      - apt-get update && apt-get -y install graphviz
       - make
 
   compress: