diff --git a/homeassistant/components/tessie/update.py b/homeassistant/components/tessie/update.py
index 9628b580697..34362c0239c 100644
--- a/homeassistant/components/tessie/update.py
+++ b/homeassistant/components/tessie/update.py
@@ -1,6 +1,10 @@
 """Update platform for Tessie integration."""
 from __future__ import annotations
 
+from typing import Any
+
+from tessie_api import schedule_software_update
+
 from homeassistant.components.update import UpdateEntity, UpdateEntityFeature
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
@@ -35,6 +39,16 @@ class TessieUpdateEntity(TessieEntity, UpdateEntity):
         """Initialize the Update."""
         super().__init__(coordinator, "update")
 
+    @property
+    def supported_features(self) -> UpdateEntityFeature:
+        """Flag supported features."""
+        if self.get("vehicle_state_software_update_status") in (
+            TessieUpdateStatus.AVAILABLE,
+            TessieUpdateStatus.SCHEDULED,
+        ):
+            return self._attr_supported_features | UpdateEntityFeature.INSTALL
+        return self._attr_supported_features
+
     @property
     def installed_version(self) -> str:
         """Return the current app version."""
@@ -63,3 +77,12 @@ class TessieUpdateEntity(TessieEntity, UpdateEntity):
         ):
             return self.get("vehicle_state_software_update_install_perc")
         return False
+
+    async def async_install(
+        self, version: str | None, backup: bool, **kwargs: Any
+    ) -> None:
+        """Install an update."""
+        await self.run(schedule_software_update, in_seconds=0)
+        self.set(
+            ("vehicle_state_software_update_status", TessieUpdateStatus.INSTALLING)
+        )
diff --git a/tests/components/tessie/fixtures/vehicles.json b/tests/components/tessie/fixtures/vehicles.json
index 9d2305a04cd..e150b9e60e7 100644
--- a/tests/components/tessie/fixtures/vehicles.json
+++ b/tests/components/tessie/fixtures/vehicles.json
@@ -248,8 +248,8 @@
           "software_update": {
             "download_perc": 100,
             "expected_duration_sec": 2700,
-            "install_perc": 10,
-            "status": "installing",
+            "install_perc": 1,
+            "status": "available",
             "version": "2023.44.30.4"
           },
           "speed_limit_mode": {
diff --git a/tests/components/tessie/test_update.py b/tests/components/tessie/test_update.py
index 1ade06d3fa7..88bf7c83dd6 100644
--- a/tests/components/tessie/test_update.py
+++ b/tests/components/tessie/test_update.py
@@ -1,5 +1,12 @@
 """Test the Tessie update platform."""
-from homeassistant.const import STATE_ON
+from unittest.mock import patch
+
+from homeassistant.components.update import (
+    ATTR_IN_PROGRESS,
+    DOMAIN as UPDATE_DOMAIN,
+    SERVICE_INSTALL,
+)
+from homeassistant.const import ATTR_ENTITY_ID, STATE_ON
 from homeassistant.core import HomeAssistant
 
 from .common import setup_platform
@@ -14,4 +21,22 @@ async def test_updates(hass: HomeAssistant) -> None:
 
     assert len(hass.states.async_all("update")) == 1
 
-    assert hass.states.get("update.test").state == STATE_ON
+    entity_id = "update.test"
+    state = hass.states.get(entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes.get(ATTR_IN_PROGRESS) is False
+
+    with patch(
+        "homeassistant.components.tessie.update.schedule_software_update"
+    ) as mock_update:
+        await hass.services.async_call(
+            UPDATE_DOMAIN,
+            SERVICE_INSTALL,
+            {ATTR_ENTITY_ID: [entity_id]},
+            blocking=True,
+        )
+        mock_update.assert_called_once()
+
+    state = hass.states.get(entity_id)
+    assert state.state == STATE_ON
+    assert state.attributes.get(ATTR_IN_PROGRESS) == 1