diff --git a/google_assistant/README.md b/google_assistant/README.md
index 3ced66bc896..a4e051c5265 100644
--- a/google_assistant/README.md
+++ b/google_assistant/README.md
@@ -1,5 +1,12 @@
 # Home Assistant Add-on: Google Assistant SDK
 
+> [!CAUTION]
+> **Deprecation notice**
+> The [Google Assistant SDK for device][google-assistant-sdk] Python library
+> this add-on depends on is no longer developed and has been archived. The
+> OAuth out-of-band (OOB) flow used by the add-on has been deprecated as well.
+> Hence a new setup is currently no longer possible.
+
 A virtual personal assistant developed by Google.
 
 ![Supports aarch64 Architecture][aarch64-shield] ![Supports amd64 Architecture][amd64-shield] ![Supports armhf Architecture][armhf-shield] ![Supports armv7 Architecture][armv7-shield] ![Supports i386 Architecture][i386-shield]
@@ -21,5 +28,6 @@ If you want to use Google Assistant (for example, from your phone or Google Home
 [google-actions]: https://actions.google.com/
 [google-assistant-integration]: https://www.home-assistant.io/integrations/google_assistant/
 [google-assistant]: https://assistant.google.com/
+[google-assistant-sdk]: https://github.com/googlesamples/assistant-sdk-python
 [i386-shield]: https://img.shields.io/badge/i386-no-red.svg
 [aarch64-shield]: https://img.shields.io/badge/aarch64-no-red.svg
diff --git a/google_assistant/config.yaml b/google_assistant/config.yaml
index 5af495a1d4d..37fb29ab41a 100644
--- a/google_assistant/config.yaml
+++ b/google_assistant/config.yaml
@@ -31,5 +31,5 @@ schema:
   feedback:
     enable: bool
     volume: int(0,100)
-stage: experimental
+stage: deprecated
 webui: http://[HOST]:[PORT:9324]