diff --git a/CHANGELOG.md b/CHANGELOG.md
index e05c099..0b597e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](https://semver.org/).
 
 
+# 1.0.0 - 2021-11-04
+## Added
+
+## Fixed
+
+## Changed
+- Upgraded to debian:bullseye-slim
+
+
 # 0.9.6 - 2021-06-25
 ## Added
 - Name and print threads for debugging
diff --git a/Makefile b/Makefile
index 2fe72d5..b8f95b4 100644
--- a/Makefile
+++ b/Makefile
@@ -66,7 +66,7 @@ VERSIONTAGS = $(shell sed -n -e 's,^VERSION = .\(\([0-9]*.[0-9]*\).[0-9]*\).$$,-
 # by overriding it on the command line, or set to `==<version>`, where
 # `<version>` is extracted from `autoblockchainify/version.py`.
 VERSIONMATCH = ==$(shell sed -n -e 's,^VERSION = .\([0-9]*.[0-9]*.[0-9]*\).*$$,\1,p' autoblockchainify/version.py)
-# debian:buster-slim also supports
+# debian:bullseye-slim also supports
 # linux/arm64/v8,linux/mips64le,linux/ppc64le,linux/s390x. If there is demand,
 # I'll happily add them to the default build.
 PLATFORMS  = linux/amd64,linux/386,linux/arm64,linux/arm/v7,linux/arm/v6