diff --git a/docker/Dockerfile.certbot b/docker/Dockerfile.certbot
index 850caed..6871c5f 100644
--- a/docker/Dockerfile.certbot
+++ b/docker/Dockerfile.certbot
@@ -2,7 +2,7 @@
 # Certbot Builder
 #############
 
-FROM debian:buster-slim as certbotbuilder
+FROM debian:bullseye-slim as certbotbuilder
 
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]