@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14', '3.15']
 
     steps:
       - name: Checkout code
 
@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Run unit tests for Python 3.15
+env_vars: {
+    key: "NOX_SESSION"
+    value: "unit-3.15"
+}
+
+# Run unit tests in parallel, splitting up by file
+env_vars: {
+    key: "PYTEST_ADDOPTS"
+    value: "-n=auto --dist=loadscope"
+}
@@ -60,7 +60,7 @@
     "recommonmark",
 )
 
-UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
+UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
 UNIT_TEST_TEMPLATES_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]
 PYTHON_TO_RAY_VERSIONS = {
     "3.10": ["2.33.0", "2.42.0"],
 
@@ -99,7 +99,7 @@
     templated_files = common.py_library(
         cov_level=98,
         system_test_python_versions=["3.10"],
-        unit_test_python_versions=["3.10", "3.11", "3.12", "3.13", "3.14"],
+        unit_test_python_versions=["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"],
         unit_test_extras=["testing"],
         system_test_extras=["testing"],
         microgenerator=True,
 
@@ -186,7 +186,8 @@
     "ruamel.yaml",
     "pyyaml",
     "litellm>=1.83.7, <1.97.0; python_version<'3.14'",
-    "litellm>=1.93.0, <1.97.0; python_version>='3.14'",
+    # litellm does not support Python 3.15 yet (Requires-Python <3.15).
+    "litellm>=1.93.0, <1.97.0; python_version=='3.14'",
     # For LiteLLM tests. Lower bound: CVE-2026-35030 plus 4 follow-on
     # advisories patched in 1.83.7. Upper bound <1.97.0 for stable interface only.
 ]
@@ -372,6 +373,7 @@
         "Programming Language :: Python :: 3.12",
         "Programming Language :: Python :: 3.13",
         "Programming Language :: Python :: 3.14",
+        "Programming Language :: Python :: 3.15",
         "Topic :: Internet",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],
 
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+# This constraints file is required for unit tests.
+# List all library dependencies and extras in this file.
+google-auth==2.49.0
+proto-plus
+mock==4.0.2
+google-cloud-storage==3.10.0 # Updated for Python 3.14 compatibility
+packaging==24.1 # Increased to unbreak canonicalize_version error (b/377774673)
+pytest-xdist==3.3.1 # Pinned to unbreak unit tests
+ray==2.5.0 # Pinned until 2.9.3 is verified for Ray tests
+ipython==8.22.2 # Pinned to unbreak TypeAliasType import error
+google-adk==0.0.2
+google-genai>=1.10.0
+google-vizier==0.1.21
+pyarrow>=22.0.0
+protobuf>=7
Original file line number	Diff line number	Diff line change
`@@ -60,7 +60,7 @@`
`60`	`60`	`"recommonmark",`
`61`	`61`	`)`
`62`	`62`
`63`		`-UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]`
	`63`	`+UNIT_TEST_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]`
`64`	`64`	`UNIT_TEST_TEMPLATES_PYTHON_VERSIONS = ["3.10", "3.11", "3.12", "3.13", "3.14"]`
`65`	`65`	`PYTHON_TO_RAY_VERSIONS = {`
`66`	`66`	`"3.10": ["2.33.0", "2.42.0"],`