diff --git a/runbot/data/Dockerfile b/runbot/data/Dockerfile
index b6a5826b..bcec2d65 100644
--- a/runbot/data/Dockerfile
+++ b/runbot/data/Dockerfile
@@ -9,6 +9,7 @@ RUN set -x ; \
     build-essential \
     ca-certificates \
     curl \
+    ffmpeg \
     file \
     fonts-freefont-ttf \
     fonts-noto-cjk \