fix(http-client-python): upgrade Python installers

.chronus/changes/python-tooling-minimums-2026-10-22.md

@@ -0,0 +1,7 @@
+---
+changeKind: fix
+packages:
+  - "@typespec/http-client-python"
+---
+
+Upgrade pip in existing generator virtual environments as well as newly created ones.

.github/workflows/ci-python.yml

@@ -22,6 +22,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Avoid npm lifecycle side effects and lockfile rewrites in CI; setup still runs build + generator install.
         run: |
@@ -82,6 +85,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Generated artifacts come from the build job; downstream jobs only need the Python package installed and test tools prepared.
         run: |
@@ -116,6 +122,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Generated artifacts come from the build job; downstream jobs only need the Python package installed and test tools prepared.
         run: |
@@ -150,6 +159,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Generated artifacts come from the build job; downstream jobs only need the Python package installed and test tools prepared.
         run: |
@@ -195,6 +207,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Generated artifacts come from the build job; downstream jobs only need the Python package installed and test tools prepared.
         run: |
@@ -225,6 +240,9 @@ jobs:
       - name: Install repo dependencies
         run: pnpm install
 
+      - name: Upgrade Python installers
+        run: python -m pip install --upgrade "pip>=26.2.2" "uv>=0.13.4"
+
       - name: Setup http-client-python
         # Windows validates build/regenerate/test in one job, so run the full setup instead of restoring Linux artifacts.
         run: |

packages/http-client-python/eng/scripts/setup/package_manager.py

@@ -142,13 +142,17 @@ def __init__(self, venv_path):
                     else str(venv_path / "Scripts" / "python.exe")
                 )
 
-        return MockVenvContext(venv_path)
+        context = MockVenvContext(venv_path)
+        install_packages(["--upgrade", "pip"], context, package_manager="uv")
+        return context
     else:
         # Use standard venv for pip
         if venv_path.exists():
             env_builder = venv.EnvBuilder(with_pip=True)
-            return env_builder.ensure_directories(venv_path)
+            context = env_builder.ensure_directories(venv_path)
+            install_packages(["--upgrade", "pip"], context, package_manager)
         else:
             env_builder = ExtendedEnvBuilder(with_pip=True, upgrade_deps=True)
             env_builder.create(venv_path)
-            return env_builder.context
+            context = env_builder.context
+        return context

packages/http-client-python/tests/install_packages.py

@@ -43,16 +43,10 @@ def build_wheels(flavor, tests_dir):
     batch_size = 50
     for i in range(0, len(packages), batch_size):
         batch = packages[i:i + batch_size]
-        try:
-            subprocess.run(
-                ["uv", "pip", "wheel", "--no-deps", "--wheel-dir", wheel_dir] + batch,
-                check=True,
-            )
-        except FileNotFoundError:
-            subprocess.run(
-                [sys.executable, "-m", "pip", "wheel", "--no-deps", "--wheel-dir", wheel_dir] + batch,
-                check=True,
-            )
+        subprocess.run(
+            [sys.executable, "-m", "pip", "wheel", "--no-deps", "--wheel-dir", wheel_dir] + batch,
+            check=True,
+        )
 
     wheel_count = len(glob.glob(os.path.join(wheel_dir, "*.whl")))
     print(f"Built {wheel_count} wheels for {flavor}")

packages/http-client-python/tests/requirements/docs.txt

@@ -1,6 +1,6 @@
 # Documentation dependencies
 -r base.txt
-pip
+pip>=26.2.2
 pylint
 pkginfo
 sphinx>=7.0.0