diff --git a/Dockerfile b/Dockerfile
index b0ece3b702d0b3ec780c639663b9ed67836a14b0..32719ce00f40e1aa1f507ecf54e87b9be561a538 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM registry.git.autistici.org/ai3/docker/s6-base:master
+FROM registry.git.autistici.org/ai3/docker/s6-base:buster
 
 COPY conf /tmp/conf
 COPY build.sh /tmp/build.sh