diff --git a/support/docker/Dockerfile b/support/docker/Dockerfile
index a9bacca3a0..2aee129668 100644
--- a/support/docker/Dockerfile
+++ b/support/docker/Dockerfile
@@ -6,7 +6,7 @@
 # We use a specific tag for the base image *and* the corresponding date
 # for the repository., so do not forget to update the apt-sources.list
 # file that is shipped next to this Dockerfile.
-FROM debian:stretch-20171210
+FROM debian:bullseye-20210902
 
 LABEL maintainer="Buildroot mailing list <buildroot@buildroot.org>" \
       vendor="Buildroot" \
diff --git a/support/docker/apt-sources.list b/support/docker/apt-sources.list
index 789fb8fc17..0f872fd398 100644
--- a/support/docker/apt-sources.list
+++ b/support/docker/apt-sources.list
@@ -1,4 +1,4 @@
-# Latest just before 20171210T000000Z:
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20171209T220346Z/ stretch main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20171209T220346Z/ stretch-updates main
-deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20171209T224618Z/ stretch/updates main
+# Latest just before 20210817T000000Z:
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20210902T205533Z/ bullseye main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian-security/20210902T193650Z/ bullseye-security main
+deb [check-valid-until=no] http://snapshot.debian.org/archive/debian/20210902T205533Z/ bullseye-updates main