diff --git a/homeassistant/components/google_assistant/helpers.py b/homeassistant/components/google_assistant/helpers.py
index 529778ce1b6..b425367f5c3 100644
--- a/homeassistant/components/google_assistant/helpers.py
+++ b/homeassistant/components/google_assistant/helpers.py
@@ -10,6 +10,7 @@ import logging
 import pprint
 
 from aiohttp.web import json_response
+from awesomeversion import AwesomeVersion
 
 from homeassistant.components import webhook
 from homeassistant.const import (
@@ -43,6 +44,8 @@ from .error import SmartHomeError
 
 SYNC_DELAY = 15
 _LOGGER = logging.getLogger(__name__)
+LOCAL_SDK_VERSION_HEADER = "HA-Cloud-Version"
+LOCAL_SDK_MIN_VERSION = AwesomeVersion("2.1.5")
 
 
 @callback
@@ -86,6 +89,7 @@ class AbstractConfig(ABC):
         self._google_sync_unsub = {}
         self._local_sdk_active = False
         self._local_last_active: datetime | None = None
+        self._local_sdk_version_warn = False
 
     async def async_initialize(self):
         """Perform async initialization of config."""
@@ -327,6 +331,18 @@ class AbstractConfig(ABC):
         from . import smart_home
 
         self._local_last_active = utcnow()
+
+        # Check version local SDK.
+        version = request.headers.get("HA-Cloud-Version")
+        if not self._local_sdk_version_warn and (
+            not version or AwesomeVersion(version) < LOCAL_SDK_MIN_VERSION
+        ):
+            _LOGGER.warning(
+                "Local SDK version is too old (%s), check documentation on how to update to the latest version",
+                version,
+            )
+            self._local_sdk_version_warn = True
+
         payload = await request.json()
 
         if _LOGGER.isEnabledFor(logging.DEBUG):
@@ -577,8 +593,9 @@ class GoogleEntity:
             device["customData"] = {
                 "webhookId": self.config.get_local_webhook_id(agent_user_id),
                 "httpPort": self.hass.http.server_port,
-                "httpSSL": self.hass.config.api.use_ssl,
                 "uuid": instance_uuid,
+                # Below can be removed in HA 2022.9
+                "httpSSL": self.hass.config.api.use_ssl,
                 "baseUrl": get_url(self.hass, prefer_external=True),
                 "proxyDeviceId": agent_user_id,
             }
diff --git a/tests/components/google_assistant/test_helpers.py b/tests/components/google_assistant/test_helpers.py
index 4490f0e3963..1ab573baf2a 100644
--- a/tests/components/google_assistant/test_helpers.py
+++ b/tests/components/google_assistant/test_helpers.py
@@ -345,3 +345,85 @@ def test_request_data():
         config, "test_user", SOURCE_CLOUD, "test_request_id", None
     )
     assert data.is_local_request is False
+
+
+async def test_config_local_sdk_allow_min_version(hass, hass_client, caplog):
+    """Test the local SDK."""
+    version = str(helpers.LOCAL_SDK_MIN_VERSION)
+    assert await async_setup_component(hass, "webhook", {})
+
+    config = MockConfig(
+        hass=hass,
+        agent_user_ids={
+            "mock-user-id": {
+                STORE_GOOGLE_LOCAL_WEBHOOK_ID: "mock-webhook-id",
+            },
+        },
+    )
+
+    client = await hass_client()
+
+    assert config._local_sdk_version_warn is False
+    config.async_enable_local_sdk()
+
+    await client.post(
+        "/api/webhook/mock-webhook-id",
+        headers={helpers.LOCAL_SDK_VERSION_HEADER: version},
+        json={
+            "inputs": [
+                {
+                    "context": {"locale_country": "US", "locale_language": "en"},
+                    "intent": "action.devices.SYNC",
+                }
+            ],
+            "requestId": "mock-req-id",
+        },
+    )
+    assert config._local_sdk_version_warn is False
+    assert (
+        f"Local SDK version is too old ({version}), check documentation on how "
+        "to update to the latest version"
+    ) not in caplog.text
+
+
+@pytest.mark.parametrize("version", (None, "2.1.4"))
+async def test_config_local_sdk_warn_version(hass, hass_client, caplog, version):
+    """Test the local SDK."""
+    assert await async_setup_component(hass, "webhook", {})
+
+    config = MockConfig(
+        hass=hass,
+        agent_user_ids={
+            "mock-user-id": {
+                STORE_GOOGLE_LOCAL_WEBHOOK_ID: "mock-webhook-id",
+            },
+        },
+    )
+
+    client = await hass_client()
+
+    assert config._local_sdk_version_warn is False
+    config.async_enable_local_sdk()
+
+    headers = {}
+    if version:
+        headers[helpers.LOCAL_SDK_VERSION_HEADER] = version
+
+    await client.post(
+        "/api/webhook/mock-webhook-id",
+        headers=headers,
+        json={
+            "inputs": [
+                {
+                    "context": {"locale_country": "US", "locale_language": "en"},
+                    "intent": "action.devices.SYNC",
+                }
+            ],
+            "requestId": "mock-req-id",
+        },
+    )
+    assert config._local_sdk_version_warn is True
+    assert (
+        f"Local SDK version is too old ({version}), check documentation on how "
+        "to update to the latest version"
+    ) in caplog.text