diff --git a/homeassistant/components/notion/__init__.py b/homeassistant/components/notion/__init__.py
index 77236ca6e0cfd3..9587f22f6cb5e9 100644
--- a/homeassistant/components/notion/__init__.py
+++ b/homeassistant/components/notion/__init__.py
@@ -181,6 +181,10 @@ def async_save_refresh_token(refresh_token: str) -> None:
     # Create a callback to save the refresh token when it changes:
     entry.async_on_unload(client.add_refresh_token_callback(async_save_refresh_token))
 
+    # Save the client's refresh token if it's different than what we already have:
+    if (token := client.refresh_token) and token != entry.data[CONF_REFRESH_TOKEN]:
+        async_save_refresh_token(token)
+
     hass.config_entries.async_update_entry(entry, **entry_updates)
 
     async def async_update() -> NotionData:
diff --git a/tests/components/notion/conftest.py b/tests/components/notion/conftest.py
index 0cded62eb31a8d..3f98491ddb6efe 100644
--- a/tests/components/notion/conftest.py
+++ b/tests/components/notion/conftest.py
@@ -10,8 +10,8 @@
 from aionotion.user.models import UserPreferences
 import pytest
 
-from homeassistant.components.notion import DOMAIN
-from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
+from homeassistant.components.notion import CONF_REFRESH_TOKEN, CONF_USER_UUID, DOMAIN
+from homeassistant.const import CONF_USERNAME
 from homeassistant.core import HomeAssistant
 
 from tests.common import MockConfigEntry, load_fixture
@@ -82,7 +82,8 @@ def config_fixture():
     """Define a config entry data fixture."""
     return {
         CONF_USERNAME: TEST_USERNAME,
-        CONF_PASSWORD: TEST_PASSWORD,
+        CONF_USER_UUID: TEST_USER_UUID,
+        CONF_REFRESH_TOKEN: TEST_REFRESH_TOKEN,
     }
 
 
diff --git a/tests/components/notion/test_config_flow.py b/tests/components/notion/test_config_flow.py
index 803d7481dbab68..827565db339955 100644
--- a/tests/components/notion/test_config_flow.py
+++ b/tests/components/notion/test_config_flow.py
@@ -11,7 +11,7 @@
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME
 from homeassistant.core import HomeAssistant
 
-from .conftest import TEST_REFRESH_TOKEN, TEST_USER_UUID, TEST_USERNAME
+from .conftest import TEST_PASSWORD, TEST_REFRESH_TOKEN, TEST_USER_UUID, TEST_USERNAME
 
 pytestmark = pytest.mark.usefixtures("mock_setup_entry")
 
@@ -27,7 +27,6 @@
 async def test_create_entry(
     hass: HomeAssistant,
     client,
-    config,
     errors,
     get_client_with_exception,
     mock_aionotion,
@@ -45,13 +44,22 @@ async def test_create_entry(
         get_client_with_exception,
     ):
         result = await hass.config_entries.flow.async_init(
-            DOMAIN, context={"source": SOURCE_USER}, data=config
+            DOMAIN,
+            context={"source": SOURCE_USER},
+            data={
+                CONF_USERNAME: TEST_USERNAME,
+                CONF_PASSWORD: TEST_PASSWORD,
+            },
         )
         assert result["type"] == data_entry_flow.FlowResultType.FORM
         assert result["errors"] == errors
 
     result = await hass.config_entries.flow.async_configure(
-        result["flow_id"], user_input=config
+        result["flow_id"],
+        user_input={
+            CONF_USERNAME: TEST_USERNAME,
+            CONF_PASSWORD: TEST_PASSWORD,
+        },
     )
     assert result["type"] == data_entry_flow.FlowResultType.CREATE_ENTRY
     assert result["title"] == TEST_USERNAME