diff --git a/.zuul.yaml b/.zuul.yaml
index f87a37f..4e03529 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -19,8 +19,8 @@
     parent: opendev-build-docker-image
     description: Build OpenDev Docker images for statusbot
     requires:
-      - python-builder-3.9-bullseye-container-image
-      - python-base-3.9-bullseye-container-image
+      - python-builder-3.11-bookworm-container-image
+      - python-base-3.11-bookworm-container-image
     provides: ptgbot-container-image
     vars: &ptgbot_opendev_image_vars
       zuul_work_dir: src/opendev.org/openstack/ptgbot
@@ -34,8 +34,8 @@
     parent: opendev-upload-docker-image
     description: Build OpenDev statusbot Docker images and upload to Docker Hub.
     requires:
-      - python-builder-3.9-bullseye-container-image
-      - python-base-3.9-bullseye-container-image
+      - python-builder-3.11-bookworm-container-image
+      - python-base-3.11-bookworm-container-image
     provides: ptgbot-container-image
     vars: *ptgbot_opendev_image_vars
     secrets:
@@ -56,14 +56,14 @@
     check:
       jobs:
         - tox-pep8
-        - tox-py38:
-            nodeset: ubuntu-focal
+        - tox-py311:
+            nodeset: ubuntu-jammy
         - ptgbot-build-opendev-image
     gate:
       jobs:
         - tox-pep8
-        - tox-py38:
-            nodeset: ubuntu-focal
+        - tox-py311:
+            nodeset: ubuntu-jammy
         - ptgbot-upload-opendev-image
     promote:
       jobs:
diff --git a/Dockerfile b/Dockerfile
index f25811d..76a3b25 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,10 @@
 
-FROM docker.io/opendevorg/python-builder:3.9-bullseye as builder
+FROM docker.io/opendevorg/python-builder:3.11-bookworm as builder
 
 COPY . /tmp/src
 RUN assemble
 
-FROM docker.io/opendevorg/python-base:3.9-bullseye as ptgbot
+FROM docker.io/opendevorg/python-base:3.11-bookworm as ptgbot
 
 COPY --from=builder /output/ /output
 RUN /output/install-from-bindep
diff --git a/ptgbot/tests/test_message_process.py b/ptgbot/tests/test_message_process.py
index 97f2a5c..28fd4ed 100644
--- a/ptgbot/tests/test_message_process.py
+++ b/ptgbot/tests/test_message_process.py
@@ -603,13 +603,13 @@ class TestProcessMessage(testtools.TestCase):
             self.bot.on_pubmsg()
             mock_send.assert_called_with(
                 '#channel',
-                "Bot airbag activated: on_pubmsg() "
+                "Bot airbag activated: PTGBot.on_pubmsg() "
                 "missing 2 required positional arguments: 'c' and 'e'"
             )
             mock_send.reset_mock()
             self.bot.on_privmsg()
             mock_send.assert_called_with(
                 '#channel',
-                "Bot airbag activated: on_privmsg() "
+                "Bot airbag activated: PTGBot.on_privmsg() "
                 "missing 2 required positional arguments: 'c' and 'e'"
             )
diff --git a/setup.cfg b/setup.cfg
index cc94838..ec33fff 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,11 +13,7 @@ classifier =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.11
 
 [files]
 packages =