diff --git a/.github/sync-repo-settings.yaml b/.github/sync-repo-settings.yaml
index 5c94998733..5a0de29a10 100644
--- a/.github/sync-repo-settings.yaml
+++ b/.github/sync-repo-settings.yaml
@@ -15,14 +15,11 @@ branchProtectionRules:
     - 'mypy (3.13)'
     - 'showcase (3.7, showcase)'
     - 'showcase (3.13, showcase)'
-    - 'showcase (3.7, showcase_alternative_templates)'
-    - 'showcase (3.13, showcase_alternative_templates)'
     - 'showcase (3.7, showcase_w_rest_async)'
     - 'showcase (3.13, showcase_w_rest_async)'
     # TODO(dovs): reenable these when the mtls tests have been debugged and fixed
     # See #1218 for details
     # - 'showcase-mtls (showcase_mtls)'
-    # - 'showcase-mtls (showcase_mtls_alternative_templates)'
     - 'showcase-mypy'
     - 'showcase-mypy (_alternative_templates)'
     - 'showcase-unit (3.7)'
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index ce5307d59a..5b2efc098d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -57,7 +57,7 @@ jobs:
       matrix:
         # TODO(https://github.com/googleapis/gapic-generator-python/issues/2121) Remove `showcase_w_rest_async` target when async rest is GA.
         python: ["3.7", "3.13"]
-        target: [showcase, showcase_alternative_templates, showcase_w_rest_async]
+        target: [showcase, showcase_w_rest_async]
         logging_scope: ["", "google"]
 
     # TODO(https://github.com/googleapis/gapic-generator-python/issues/2303): use `ubuntu-latest` once this bug is fixed.
@@ -102,7 +102,7 @@ jobs:
     if: ${{ false }}            # TODO(dovs): reenable when #1218 is fixed
     strategy:
       matrix:
-        target: [showcase_mtls, showcase_mtls_alternative_templates]
+        target: [showcase_mtls]
       max-parallel: 1
     runs-on: ubuntu-latest
     steps:
diff --git a/noxfile.py b/noxfile.py
index 3198eb9641..b4f8b203de 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -461,28 +461,6 @@ def showcase_mtls(
         )
 
 
-@nox.session(python=ALL_PYTHON)
-def showcase_alternative_templates(session):
-    templates = path.join(path.dirname(__file__), "gapic", "ads-templates")
-    showcase(
-        session,
-        templates=templates,
-        other_opts=("old-naming",),
-        env={"GAPIC_PYTHON_ASYNC": "False", "IGNORE_FILE": "test_universe_domain.py"},
-    )
-
-
-@nox.session(python=NEWEST_PYTHON)
-def showcase_mtls_alternative_templates(session):
-    templates = path.join(path.dirname(__file__), "gapic", "ads-templates")
-    showcase_mtls(
-        session,
-        templates=templates,
-        other_opts=("old-naming",),
-        env={"GAPIC_PYTHON_ASYNC": "False", "IGNORE_FILE": "test_universe_domain.py"},
-    )
-
-
 def run_showcase_unit_tests(session, fail_under=100, rest_async_io_enabled=False):
     session.install(
         "coverage",