diff --git a/publish-python.yaml b/publish-python.yaml
index 4b25540..3a0a1f1 100644
--- a/publish-python.yaml
+++ b/publish-python.yaml
@@ -8,9 +8,7 @@ artifacts:
         config:
           repository: dirk-thomas/colcon
           distributions:
-            - ubuntu:bionic
             - ubuntu:focal
             - ubuntu:jammy
-            - debian:stretch
-            - debian:buster
             - debian:bullseye
+            - debian:bookworm
diff --git a/setup.cfg b/setup.cfg
index dcd26ab..516295c 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -25,6 +25,7 @@ long_description = file: README.rst
 keywords = colcon
 
 [options]
+python_requires = >=3.6
 install_requires =
   colcon-core>=0.3.7
   notify2; sys_platform == 'linux'
diff --git a/stdeb.cfg b/stdeb.cfg
index 71e6380..34a75d3 100644
--- a/stdeb.cfg
+++ b/stdeb.cfg
@@ -2,6 +2,6 @@
 No-Python2:
 Build-Depends: python3-setuptools (>= 53.1.0)
 Depends3: python3-colcon-core (>= 0.3.7), python3-notify2
-Suite: bionic focal jammy stretch buster bullseye
-X-Python3-Version: >= 3.5
+Suite: focal jammy bullseye bookworm
+X-Python3-Version: >= 3.6
 Setup-Env-Vars: BUILD_DEBIAN_PACKAGE=1