diff --git a/.github/workflows/pr-ci.yml b/.github/workflows/pr-ci.yml
index f6489f24..ae8ab0d7 100644
--- a/.github/workflows/pr-ci.yml
+++ b/.github/workflows/pr-ci.yml
@@ -2,9 +2,7 @@ name: PR CI
 
 "on":
   pull_request:
-    branches:
-      - main
-      - "codex/ccu-stack-*"
+    branches: [main]
     types: [opened, reopened, synchronize, ready_for_review, converted_to_draft, closed]
 
 permissions:
diff --git a/tests/ci/test_workflows.rb b/tests/ci/test_workflows.rb
index 4a0e099e..69690d28 100644
--- a/tests/ci/test_workflows.rb
+++ b/tests/ci/test_workflows.rb
@@ -45,8 +45,8 @@ def named_step(workflow, job_name, step_name)
 assert_equal(["pull_request"], pr.fetch("on").keys,
              "PR workflow must use only pull_request")
 pull_request = pr.fetch("on").fetch("pull_request")
-assert_equal(["main", "codex/ccu-stack-*"], pull_request.fetch("branches"),
-             "PR workflow must target main and the temporary CCU stack")
+assert_equal(["main"], pull_request.fetch("branches"),
+             "PR workflow must target main")
 assert_equal(%w[opened reopened synchronize ready_for_review converted_to_draft closed],
              pull_request.fetch("types"), "PR event types differ")
 assert_equal({"contents" => "read"}, pr.fetch("permissions"),