diff --git a/api_names_out.yaml b/api_names_out.yaml
index 3e72c8b351a..3aa9f6c94f2 100644
--- a/api_names_out.yaml
+++ b/api_names_out.yaml
@@ -26605,6 +26605,7 @@
 "/alloydb:v1beta/Cluster/labels/label": label
 "/alloydb:v1beta/Cluster/maintenanceSchedule": maintenance_schedule
 "/alloydb:v1beta/Cluster/maintenanceUpdatePolicy": maintenance_update_policy
+"/alloydb:v1beta/Cluster/maintenanceVersionSelectionPolicy": maintenance_version_selection_policy
 "/alloydb:v1beta/Cluster/migrationSource": migration_source
 "/alloydb:v1beta/Cluster/name": name
 "/alloydb:v1beta/Cluster/network": network
diff --git a/generated/google-apis-alloydb_v1beta/CHANGELOG.md b/generated/google-apis-alloydb_v1beta/CHANGELOG.md
index def65f5f6ff..b2033440cd4 100644
--- a/generated/google-apis-alloydb_v1beta/CHANGELOG.md
+++ b/generated/google-apis-alloydb_v1beta/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release history for google-apis-alloydb_v1beta
 
+### v0.39.0 (2025-10-19)
+
+* Regenerated from discovery document revision 20251009
+
 ### v0.38.0 (2025-10-05)
 
 * Regenerated from discovery document revision 20250925
diff --git a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/classes.rb b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/classes.rb
index 0ece54261db..b943eecb5d8 100644
--- a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/classes.rb
+++ b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/classes.rb
@@ -721,6 +721,12 @@ class Cluster
         # @return [Google::Apis::AlloydbV1beta::MaintenanceUpdatePolicy]
         attr_accessor :maintenance_update_policy
       
+        # Input only. Policy to use to automatically select the maintenance version to
+        # which to update the cluster's instances.
+        # Corresponds to the JSON property `maintenanceVersionSelectionPolicy`
+        # @return [String]
+        attr_accessor :maintenance_version_selection_policy
+      
         # Subset of the source instance configuration that is available when reading the
         # cluster resource.
         # Corresponds to the JSON property `migrationSource`
@@ -856,6 +862,7 @@ def update!(**args)
           @labels = args[:labels] if args.key?(:labels)
           @maintenance_schedule = args[:maintenance_schedule] if args.key?(:maintenance_schedule)
           @maintenance_update_policy = args[:maintenance_update_policy] if args.key?(:maintenance_update_policy)
+          @maintenance_version_selection_policy = args[:maintenance_version_selection_policy] if args.key?(:maintenance_version_selection_policy)
           @migration_source = args[:migration_source] if args.key?(:migration_source)
           @name = args[:name] if args.key?(:name)
           @network = args[:network] if args.key?(:network)
diff --git a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/gem_version.rb b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/gem_version.rb
index cd653edeefb..f46f7c1571b 100644
--- a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/gem_version.rb
+++ b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/gem_version.rb
@@ -16,13 +16,13 @@ module Google
   module Apis
     module AlloydbV1beta
       # Version of the google-apis-alloydb_v1beta gem
-      GEM_VERSION = "0.38.0"
+      GEM_VERSION = "0.39.0"
 
       # Version of the code generator used to generate this client
       GENERATOR_VERSION = "0.18.0"
 
       # Revision of the discovery document this client was generated from
-      REVISION = "20250925"
+      REVISION = "20251009"
     end
   end
 end
diff --git a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/representations.rb b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/representations.rb
index 8a6dc343691..5a1ae93ac50 100644
--- a/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/representations.rb
+++ b/generated/google-apis-alloydb_v1beta/lib/google/apis/alloydb_v1beta/representations.rb
@@ -933,6 +933,7 @@ class Representation < Google::Apis::Core::JsonRepresentation
       
           property :maintenance_update_policy, as: 'maintenanceUpdatePolicy', class: Google::Apis::AlloydbV1beta::MaintenanceUpdatePolicy, decorator: Google::Apis::AlloydbV1beta::MaintenanceUpdatePolicy::Representation
       
+          property :maintenance_version_selection_policy, as: 'maintenanceVersionSelectionPolicy'
           property :migration_source, as: 'migrationSource', class: Google::Apis::AlloydbV1beta::MigrationSource, decorator: Google::Apis::AlloydbV1beta::MigrationSource::Representation
       
           property :name, as: 'name'