diff --git a/homeassistant/components/purpleair/diagnostics.py b/homeassistant/components/purpleair/diagnostics.py
index 30f1deeb36844e..f7c44b7e9b2e65 100644
--- a/homeassistant/components/purpleair/diagnostics.py
+++ b/homeassistant/components/purpleair/diagnostics.py
@@ -37,7 +37,7 @@ async def async_get_config_entry_diagnostics(
     return async_redact_data(
         {
             "entry": entry.as_dict(),
-            "data": coordinator.data.dict(),  # type: ignore[deprecated]
+            "data": coordinator.data.model_dump(),
         },
         TO_REDACT,
     )
diff --git a/tests/components/purpleair/conftest.py b/tests/components/purpleair/conftest.py
index 3d6776dd12e6b2..1809b16bd75824 100644
--- a/tests/components/purpleair/conftest.py
+++ b/tests/components/purpleair/conftest.py
@@ -73,7 +73,7 @@ def config_entry_options_fixture() -> dict[str, Any]:
 @pytest.fixture(name="get_sensors_response", scope="package")
 def get_sensors_response_fixture() -> GetSensorsResponse:
     """Define a fixture to mock an aiopurpleair GetSensorsResponse object."""
-    return GetSensorsResponse.parse_raw(
+    return GetSensorsResponse.model_validate_json(
         load_fixture("get_sensors_response.json", "purpleair")
     )