diff --git a/README.chromium b/README.chromium
index a97e58fa5c..b4c19c0575 100644
--- a/README.chromium
+++ b/README.chromium
@@ -6,6 +6,7 @@ License: BSD-3-Clause
 License File: LICENSE
 Shipped: yes
 Security Critical: yes
+Update Mechanism: Manual
 Mitigated: CVE-2022-2294
 CVE-2022-2294: Fixed by https://crbug.com/40060120.
 
diff --git a/modules/third_party/portaudio/README.chromium b/modules/third_party/portaudio/README.chromium
index d912d912e2..ac300bb34a 100644
--- a/modules/third_party/portaudio/README.chromium
+++ b/modules/third_party/portaudio/README.chromium
@@ -6,6 +6,7 @@ Date: 2022-04-12
 License: MIT
 License File: LICENSE
 Security Critical: yes
+Update Mechanism: Manual
 Shipped: yes
 
 Description: