diff --git a/docker/app/Dockerfile b/docker/app/Dockerfile
index 0bdb5c76..409d2a83 100644
--- a/docker/app/Dockerfile
+++ b/docker/app/Dockerfile
@@ -1,5 +1,6 @@
 FROM elixir:1.13.4-alpine
 
+ADD https://api.github.com/repos/philomena-dev/FFmpeg/git/refs/heads/release/5.1 /tmp/ffmpeg_version.json
 RUN (echo "https://github.com/philomena-dev/prebuilt-ffmpeg/raw/master"; cat /etc/apk/repositories) > /tmp/repositories \
     && cp /tmp/repositories /etc/apk/repositories \
     && apk update --allow-untrusted \