diff --git a/.github/actions/azure-functions-integration-setup/action.yml b/.github/actions/azure-functions-integration-setup/action.yml
index f0de0f6797..28c1c6cd1d 100644
--- a/.github/actions/azure-functions-integration-setup/action.yml
+++ b/.github/actions/azure-functions-integration-setup/action.yml
@@ -46,22 +46,3 @@ runs:
           echo "Installing Azure Functions Core Tools"
           npm install -g azure-functions-core-tools@4 --unsafe-perm true
           func --version
-      - name: Ensure Python 3.12 is available for Azure Functions worker
-        shell: bash
-        run: |
-          # The Azure Functions Python worker may segfault on Python >=3.13
-          # (protobuf C extension crash).  Ensure a compatible Python is
-          # available so the conftest can redirect the worker to it.
-          if ! python3.12 --version 2>/dev/null; then
-            echo "Python 3.12 not found on system, installing via uv..."
-            uv python install 3.12
-            FUNC_WORKER_PYTHON="$(uv python find 3.12)"
-            if [ -n "${FUNC_WORKER_PYTHON}" ] && [ -f "${FUNC_WORKER_PYTHON}" ]; then
-              echo "FUNC_WORKER_PYTHON=${FUNC_WORKER_PYTHON}" >> "$GITHUB_ENV"
-              echo "Installed Python 3.12 at ${FUNC_WORKER_PYTHON}"
-            else
-              echo "::warning::Could not resolve Python 3.12 path after install"
-            fi
-          else
-            echo "System Python 3.12 found: $(which python3.12)"
-          fi
diff --git a/python/packages/azurefunctions/tests/integration_tests/conftest.py b/python/packages/azurefunctions/tests/integration_tests/conftest.py
index 7045ce4930..907ad039ca 100644
--- a/python/packages/azurefunctions/tests/integration_tests/conftest.py
+++ b/python/packages/azurefunctions/tests/integration_tests/conftest.py
@@ -350,35 +350,6 @@ def _load_and_validate_env() -> None:
         )
 
 
-def _find_func_worker_python() -> str | None:
-    """Find a Python 3.10-3.12 executable for the Azure Functions worker.
-
-    The Azure Functions Core Tools worker may segfault on Python >=3.13 due to
-    protobuf/grpcio C extension compatibility issues (``google._upb`` crash).
-    This returns a path to a compatible Python interpreter so the function host
-    can use it instead of the default (which is the test runner's Python).
-
-    Returns ``None`` when the current interpreter is already compatible or no
-    alternative can be found.
-    """
-    if sys.version_info < (3, 13):
-        return None  # Current Python is compatible; no override needed.
-
-    # Check for an explicit override first (e.g. set by CI).
-    explicit = os.environ.get("FUNC_WORKER_PYTHON", "").strip()
-    if explicit and Path(explicit).is_file():
-        return explicit
-
-    # Try versioned system executables (python3.12, python3.11, python3.10).
-    # Azure Functions v4 supports Python 3.10–3.12.
-    for minor in range(12, 9, -1):
-        path = shutil.which(f"python3.{minor}")
-        if path:
-            return path
-
-    return None
-
-
 def _start_function_app(sample_path: Path, port: int) -> subprocess.Popen[Any]:
     """Start a function app in the specified sample directory.
 
@@ -390,15 +361,13 @@ def _start_function_app(sample_path: Path, port: int) -> subprocess.Popen[Any]:
     # use the task hub name to separate orchestration state.
     env["TASKHUB_NAME"] = f"test{uuid.uuid4().hex[:8]}"
 
-    # The Azure Functions Python worker may crash on Python >=3.13 with a
-    # SIGSEGV in the protobuf C extension (google._upb).  Point the worker at
-    # a compatible Python when one is available.
-    worker_python = _find_func_worker_python()
-    if worker_python:
-        # Azure Functions uses double-underscore separators for nested config
-        # keys passed as environment variables (host.json equivalent:
-        # languageWorkers.python.defaultExecutablePath).
-        env["languageWorkers__python__defaultExecutablePath"] = worker_python
+    # The Azure Functions Python worker's dependency isolation mechanism crashes
+    # on Python 3.13 with a SIGSEGV in the protobuf C extension (google._upb).
+    # Disabling isolation lets the worker load dependencies from the app's own
+    # environment, which avoids the crash.
+    # See: https://github.com/Azure/azure-functions-python-worker/issues/1797
+    if sys.version_info >= (3, 13):
+        env.setdefault("PYTHON_ISOLATE_WORKER_DEPENDENCIES", "0")
 
     # On Windows, use CREATE_NEW_PROCESS_GROUP to allow proper termination
     # shell=True only on Windows to handle PATH resolution