diff --git a/clients/content/lib/google_api/content/v21/metadata.ex b/clients/content/lib/google_api/content/v21/metadata.ex
index 8e08c0ecf2..ffb2d69157 100644
--- a/clients/content/lib/google_api/content/v21/metadata.ex
+++ b/clients/content/lib/google_api/content/v21/metadata.ex
@@ -20,7 +20,7 @@ defmodule GoogleApi.Content.V21 do
   API client metadata for GoogleApi.Content.V21.
   """
 
-  @discovery_revision "20241217"
+  @discovery_revision "20250115"
 
   def discovery_revision(), do: @discovery_revision
 end
diff --git a/clients/content/lib/google_api/content/v21/model/attribution_settings.ex b/clients/content/lib/google_api/content/v21/model/attribution_settings.ex
index f0a3edb086..2d6f16c71a 100644
--- a/clients/content/lib/google_api/content/v21/model/attribution_settings.ex
+++ b/clients/content/lib/google_api/content/v21/model/attribution_settings.ex
@@ -22,7 +22,7 @@ defmodule GoogleApi.Content.V21.Model.AttributionSettings do
   ## Attributes
 
   *   `attributionLookbackWindowInDays` (*type:* `integer()`, *default:* `nil`) - Required. Lookback windows (in days) used for attribution in this source. Supported values are 7, 30, 40.
-  *   `attributionModel` (*type:* `String.t`, *default:* `nil`) - Required. Attribution model.
+  *   `attributionModel` (*type:* `String.t`, *default:* `nil`) - 
   *   `conversionType` (*type:* `list(GoogleApi.Content.V21.Model.AttributionSettingsConversionType.t)`, *default:* `nil`) - Immutable. Unordered list. List of different conversion types a conversion event can be classified as. A standard "purchase" type will be automatically created if this list is empty at creation time.
   """