diff --git a/Dockerfile b/Dockerfile
index f1393a0..56d7018 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-ARG DEBIAN_VERSION=buster-slim
+ARG DEBIAN_VERSION=bullseye-slim
 FROM debian:${DEBIAN_VERSION}
 ARG CONFD_VERSION=0.16.0
 ADD https://github.com/kelseyhightower/confd/releases/download/v${CONFD_VERSION}/confd-${CONFD_VERSION}-linux-amd64 /usr/local/bin/confd