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 1be4797..f927160 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
 packages = find:
diff --git a/stdeb.cfg b/stdeb.cfg
index 63feb15..cbd3626 100644
--- a/stdeb.cfg
+++ b/stdeb.cfg
@@ -1,5 +1,5 @@
 [colcon-library-path]
 No-Python2:
 Depends3: python3-colcon-core
-Suite: bionic focal jammy stretch buster bullseye
-X-Python3-Version: >= 3.5
+Suite: focal jammy bullseye bookworm
+X-Python3-Version: >= 3.6