diff --git a/generated/google-apis-apigateway_v1beta/CHANGELOG.md b/generated/google-apis-apigateway_v1beta/CHANGELOG.md
index a20e2c086c5..d691c47ca7d 100644
--- a/generated/google-apis-apigateway_v1beta/CHANGELOG.md
+++ b/generated/google-apis-apigateway_v1beta/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release history for google-apis-apigateway_v1beta
 
+### v0.39.0 (2025-12-21)
+
+* Regenerated from discovery document revision 20251210
+
 ### v0.38.0 (2025-11-02)
 
 * Regenerated from discovery document revision 20251021
diff --git a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/classes.rb b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/classes.rb
index 30bcdbfefc9..605c79f9a00 100644
--- a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/classes.rb
+++ b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/classes.rb
@@ -747,8 +747,9 @@ class ApigatewayListOperationsResponse
         attr_accessor :operations
       
         # Unordered list. Unreachable resources. Populated when the request sets `
-        # ListOperationsRequest.return_partial_success` and reads across collections e.g.
-        # when attempting to list all resources across all supported locations.
+        # ListOperationsRequest.return_partial_success` and reads across collections.
+        # For example, when attempting to list all resources across all supported
+        # locations.
         # Corresponds to the JSON property `unreachable`
         # @return [Array<String>]
         attr_accessor :unreachable
diff --git a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/gem_version.rb b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/gem_version.rb
index 3637fdf6d88..864fd97ba9e 100644
--- a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/gem_version.rb
+++ b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/gem_version.rb
@@ -16,13 +16,13 @@ module Google
   module Apis
     module ApigatewayV1beta
       # Version of the google-apis-apigateway_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 = "20251021"
+      REVISION = "20251210"
     end
   end
 end
diff --git a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/service.rb b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/service.rb
index 73dbcf383eb..88158d50b4d 100644
--- a/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/service.rb
+++ b/generated/google-apis-apigateway_v1beta/lib/google/apis/apigateway_v1beta/service.rb
@@ -1156,11 +1156,12 @@ def get_project_location_operation(name, fields: nil, quota_user: nil, options:
         #   The standard list page token.
         # @param [Boolean] return_partial_success
         #   When set to `true`, operations that are reachable are returned as normal, and
-        #   those that are unreachable are returned in the [ListOperationsResponse.
-        #   unreachable] field. This can only be `true` when reading across collections e.
-        #   g. when `parent` is set to `"projects/example/locations/-"`. This field is not
-        #   by default supported and will result in an `UNIMPLEMENTED` error if set unless
-        #   explicitly documented otherwise in service or product specific documentation.
+        #   those that are unreachable are returned in the ListOperationsResponse.
+        #   unreachable field. This can only be `true` when reading across collections.
+        #   For example, when `parent` is set to `"projects/example/locations/-"`. This
+        #   field is not supported by default and will result in an `UNIMPLEMENTED` error
+        #   if set unless explicitly documented otherwise in service or product specific
+        #   documentation.
         # @param [String] fields
         #   Selector specifying which fields to include in a partial response.
         # @param [String] quota_user