diff --git a/.github/workflows/python-sdk-tests.yml b/.github/workflows/python-sdk-tests.yml
index e51ee3f3c8..72a89972db 100644
--- a/.github/workflows/python-sdk-tests.yml
+++ b/.github/workflows/python-sdk-tests.yml
@@ -22,13 +22,15 @@ jobs:
         working-directory: ./python
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: "3.11"
-      - name: Set up uv
+      - name: Set up uv and Python
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
+          python-version: "3.11"
+          activate-environment: true
+          working-directory: python
           enable-cache: true
+          cache-python: true
+          cache-suffix: validate
       - name: Install Python dev dependencies
         run: uv sync --all-extras --dev
       - name: Run ruff format check
@@ -39,7 +41,7 @@ jobs:
         run: uv run ty check copilot
 
   test:
-    name: "Python SDK Tests (${{ matrix.os }}, ${{ matrix.transport }})"
+    name: "Python SDK Tests (Python ${{ matrix.python-version }}, ${{ matrix.os }}, ${{ matrix.transport }})"
     if: github.event.repository.fork == false
     env:
       POWERSHELL_UPDATECHECK: Off
@@ -47,8 +49,8 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        # Test the oldest supported Python version to make sure compatibility is maintained.
-        python-version: ["3.11"]
+        # Test the oldest and newest supported Python versions.
+        python-version: ["3.11", "3.15"]
         transport: ["default", "inprocess"]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 20
@@ -58,19 +60,21 @@ jobs:
         working-directory: ./python
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
-        with:
-          python-version: ${{ matrix.python-version }}
       - uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
         with:
           node-version: "22"
           cache: "npm"
           cache-dependency-path: "./nodejs/package-lock.json"
 
-      - name: Set up uv
+      - name: Set up uv and Python
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
         with:
+          python-version: ${{ matrix.python-version }}
+          activate-environment: true
+          working-directory: python
           enable-cache: true
+          cache-python: true
+          cache-suffix: ${{ matrix.transport }}
 
       - name: Install Python dev dependencies
         run: uv sync --all-extras --dev
diff --git a/python/pyproject.toml b/python/pyproject.toml
index e96c587a64..6809718c72 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
 ]
 dependencies = [
     "python-dateutil>=2.9.0.post0",