diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index e5e3c22d19..9db56f8b0c 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -17,8 +17,14 @@ env:
   SHOWCASE_VERSION: 0.35.0
   PROTOC_VERSION: 3.20.2
   OLDEST_PYTHON: 3.7
-  LATEST_STABLE_PYTHON: 3.13
-  PRE_RELEASE_PYTHON: 3.14
+  LATEST_STABLE_PYTHON: 3.14
+  # TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+  # Switch this to Python 3.15 alpha1 pre-release
+  # https://peps.python.org/pep-0790/
+  PREVIEW_PYTHON_VERSION: 3.14
+  # TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+  # Add Python 3.15 alpha1 pre-release
+  # https://peps.python.org/pep-0790/
   ALL_PYTHON: "['3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13', '3.14']"
 
 permissions:
@@ -431,10 +437,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - name: Set up Python ${{ env.PRE_RELEASE_PYTHON }}
+      - name: Set up Python ${{ env.PREVIEW_PYTHON_VERSION }}
         uses: actions/setup-python@v6
         with:
-          python-version: "${{ env.PRE_RELEASE_PYTHON }}"
+          python-version: "${{ env.PREVIEW_PYTHON_VERSION }}"
           cache: 'pip'
           allow-prereleases: true
       - name: Install nox.
diff --git a/gapic/ads-templates/noxfile.py.j2 b/gapic/ads-templates/noxfile.py.j2
index 9a2836cb8f..48646feb5e 100644
--- a/gapic/ads-templates/noxfile.py.j2
+++ b/gapic/ads-templates/noxfile.py.j2
@@ -7,6 +7,9 @@ import os
 import nox  # type: ignore
 
 
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Add tests for Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
 ALL_PYTHON = [
     "3.7",
     "3.8",
@@ -15,6 +18,7 @@ ALL_PYTHON = [
     "3.11",
     "3.12",
     "3.13",
+    "3.14",
 ]
 
 @nox.session(python=ALL_PYTHON)
diff --git a/gapic/ads-templates/setup.py.j2 b/gapic/ads-templates/setup.py.j2
index b041173f85..97ed76176d 100644
--- a/gapic/ads-templates/setup.py.j2
+++ b/gapic/ads-templates/setup.py.j2
@@ -73,6 +73,7 @@ setuptools.setup(
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/gapic/templates/noxfile.py.j2 b/gapic/templates/noxfile.py.j2
index e4c356cbf6..976fa2ccad 100644
--- a/gapic/templates/noxfile.py.j2
+++ b/gapic/templates/noxfile.py.j2
@@ -32,8 +32,12 @@ ALL_PYTHON = [
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -429,7 +433,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/gapic/templates/setup.py.j2 b/gapic/templates/setup.py.j2
index 2f265dd994..c9dd854b97 100644
--- a/gapic/templates/setup.py.j2
+++ b/gapic/templates/setup.py.j2
@@ -94,6 +94,7 @@ setuptools.setup(
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/noxfile.py b/noxfile.py
index 99dab8a441..bfc4fff8b4 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -47,7 +47,7 @@
     "3.14",
 )
 
-NEWEST_PYTHON = ALL_PYTHON[-2]
+NEWEST_PYTHON = ALL_PYTHON[-1]
 
 
 @nox.session(python=ALL_PYTHON)
diff --git a/setup.py b/setup.py
index bc48d16750..703c8b367f 100644
--- a/setup.py
+++ b/setup.py
@@ -77,6 +77,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Software Development :: Code Generators",
         "Topic :: Software Development :: Libraries :: Python Modules",
diff --git a/tests/integration/goldens/asset/noxfile.py b/tests/integration/goldens/asset/noxfile.py
index b61714a579..842750346c 100755
--- a/tests/integration/goldens/asset/noxfile.py
+++ b/tests/integration/goldens/asset/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/asset/setup.py b/tests/integration/goldens/asset/setup.py
index 5d506dc2d9..101ea9331d 100755
--- a/tests/integration/goldens/asset/setup.py
+++ b/tests/integration/goldens/asset/setup.py
@@ -88,6 +88,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/credentials/noxfile.py b/tests/integration/goldens/credentials/noxfile.py
index 9dbefde7b9..e5f8864a33 100755
--- a/tests/integration/goldens/credentials/noxfile.py
+++ b/tests/integration/goldens/credentials/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/credentials/setup.py b/tests/integration/goldens/credentials/setup.py
index 6ffe75b3ba..a4c5041746 100755
--- a/tests/integration/goldens/credentials/setup.py
+++ b/tests/integration/goldens/credentials/setup.py
@@ -85,6 +85,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/eventarc/noxfile.py b/tests/integration/goldens/eventarc/noxfile.py
index 8a915a5d09..9af468e682 100755
--- a/tests/integration/goldens/eventarc/noxfile.py
+++ b/tests/integration/goldens/eventarc/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/eventarc/setup.py b/tests/integration/goldens/eventarc/setup.py
index 4cba69da02..bd40117afd 100755
--- a/tests/integration/goldens/eventarc/setup.py
+++ b/tests/integration/goldens/eventarc/setup.py
@@ -86,6 +86,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/logging/noxfile.py b/tests/integration/goldens/logging/noxfile.py
index d397b029d2..0aa3b63010 100755
--- a/tests/integration/goldens/logging/noxfile.py
+++ b/tests/integration/goldens/logging/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/logging/setup.py b/tests/integration/goldens/logging/setup.py
index 23a3a12a2b..a654413004 100755
--- a/tests/integration/goldens/logging/setup.py
+++ b/tests/integration/goldens/logging/setup.py
@@ -85,6 +85,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/logging_internal/noxfile.py b/tests/integration/goldens/logging_internal/noxfile.py
index d397b029d2..0aa3b63010 100755
--- a/tests/integration/goldens/logging_internal/noxfile.py
+++ b/tests/integration/goldens/logging_internal/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/logging_internal/setup.py b/tests/integration/goldens/logging_internal/setup.py
index 23a3a12a2b..a654413004 100755
--- a/tests/integration/goldens/logging_internal/setup.py
+++ b/tests/integration/goldens/logging_internal/setup.py
@@ -85,6 +85,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/redis/noxfile.py b/tests/integration/goldens/redis/noxfile.py
index d798ed9a37..d52df038ca 100755
--- a/tests/integration/goldens/redis/noxfile.py
+++ b/tests/integration/goldens/redis/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/redis/setup.py b/tests/integration/goldens/redis/setup.py
index 54fece2f91..7abe41328b 100755
--- a/tests/integration/goldens/redis/setup.py
+++ b/tests/integration/goldens/redis/setup.py
@@ -89,6 +89,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],
diff --git a/tests/integration/goldens/redis_selective/noxfile.py b/tests/integration/goldens/redis_selective/noxfile.py
index d798ed9a37..d52df038ca 100755
--- a/tests/integration/goldens/redis_selective/noxfile.py
+++ b/tests/integration/goldens/redis_selective/noxfile.py
@@ -39,8 +39,12 @@
     "3.14",
 ]
 
-DEFAULT_PYTHON_VERSION = ALL_PYTHON[-2]
-PRE_RELEASE_PYTHON = ALL_PYTHON[-1]
+DEFAULT_PYTHON_VERSION = "3.14"
+
+# TODO(https://github.com/googleapis/gapic-generator-python/issues/2450):
+# Switch this to Python 3.15 alpha1
+# https://peps.python.org/pep-0790/
+PREVIEW_PYTHON_VERSION = "3.14"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -423,7 +427,7 @@ def docfx(session):
     )
 
 
-@nox.session(python=PRE_RELEASE_PYTHON)
+@nox.session(python=PREVIEW_PYTHON_VERSION)
 @nox.parametrize(
     "protobuf_implementation",
     ["python", "upb", "cpp"],
diff --git a/tests/integration/goldens/redis_selective/setup.py b/tests/integration/goldens/redis_selective/setup.py
index 54fece2f91..7abe41328b 100755
--- a/tests/integration/goldens/redis_selective/setup.py
+++ b/tests/integration/goldens/redis_selective/setup.py
@@ -89,6 +89,7 @@
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
+        "Programming Language :: Python :: 3.14",
         "Operating System :: OS Independent",
         "Topic :: Internet",
     ],