diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 26306af6..d3e6dde9 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,4 +1,4 @@
-# Copyright 2024 Google LLC
+# Copyright 2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:8e3e7e18255c22d1489258d0374c901c01f9c4fd77a12088670cd73d580aa737
-# created: 2024-12-17T00:59:58.625514486Z
+  digest: sha256:68634701216dd3347e5a019ac43d42a9b9c45444ea5e2e7293d3f8ec32a5d74f
+# created: 2025-01-02T22:46:30.488722725Z
diff --git a/.github/workflows/unittest.yml b/.github/workflows/unittest.yml
index 72df04e2..bd885a9e 100644
--- a/.github/workflows/unittest.yml
+++ b/.github/workflows/unittest.yml
@@ -5,7 +5,10 @@ on:
 name: unittest
 jobs:
   unit:
-    runs-on: ubuntu-latest
+    # TODO(https://github.com/googleapis/gapic-generator-python/issues/2303): use `ubuntu-latest` once this bug is fixed.
+    # Use ubuntu-22.04 until Python 3.7 is removed from the test matrix
+    # https://docs.github.com/en/actions/using-github-hosted-runners/using-github-hosted-runners/about-github-hosted-runners#standard-github-hosted-runners-for-public-repositories
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13']