--- a/Dockerfile	Mon Nov 22 12:16:05 2021 +0000
+++ b/Dockerfile	Mon Nov 22 12:16:17 2021 +0000
@@ -29,7 +29,7 @@
  && make -C luaunbound-0.5
 
 ############################
-FROM debian:buster-slim
+FROM debian:bullseye-slim
 
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \