diff --git a/api_names_out.yaml b/api_names_out.yaml
index 87cfe9edb96..876206633fa 100644
--- a/api_names_out.yaml
+++ b/api_names_out.yaml
@@ -67148,9 +67148,11 @@
 "/bigquerydatatransfer:v1/quotaUser": quota_user
 "/bigqueryreservation:v1/Assignment": assignment
 "/bigqueryreservation:v1/Assignment/assignee": assignee
+"/bigqueryreservation:v1/Assignment/condition": condition
 "/bigqueryreservation:v1/Assignment/enableGeminiInBigquery": enable_gemini_in_bigquery
 "/bigqueryreservation:v1/Assignment/jobType": job_type
 "/bigqueryreservation:v1/Assignment/name": name
+"/bigqueryreservation:v1/Assignment/precedence": precedence
 "/bigqueryreservation:v1/Assignment/principal": principal
 "/bigqueryreservation:v1/Assignment/schedulingPolicy": scheduling_policy
 "/bigqueryreservation:v1/Assignment/state": state
@@ -67268,8 +67270,10 @@
 "/bigqueryreservation:v1/Reservation/slotCapacity": slot_capacity
 "/bigqueryreservation:v1/Reservation/updateTime": update_time
 "/bigqueryreservation:v1/ReservationGroup": reservation_group
+"/bigqueryreservation:v1/ReservationGroup/creationTime": creation_time
 "/bigqueryreservation:v1/ReservationGroup/name": name
 "/bigqueryreservation:v1/ReservationGroup/parentGroup": parent_group
+"/bigqueryreservation:v1/ReservationGroup/updateTime": update_time
 "/bigqueryreservation:v1/SchedulingPolicy": scheduling_policy
 "/bigqueryreservation:v1/SchedulingPolicy/concurrency": concurrency
 "/bigqueryreservation:v1/SchedulingPolicy/maxSlots": max_slots
diff --git a/generated/google-apis-bigqueryreservation_v1/CHANGELOG.md b/generated/google-apis-bigqueryreservation_v1/CHANGELOG.md
index b5213ce8b15..78cb68cf0b3 100644
--- a/generated/google-apis-bigqueryreservation_v1/CHANGELOG.md
+++ b/generated/google-apis-bigqueryreservation_v1/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Release history for google-apis-bigqueryreservation_v1
 
+### v0.56.0 (2026-08-30)
+
+* Regenerated from discovery document revision 20260819
+
 ### v0.55.0 (2026-07-26)
 
 * Regenerated from discovery document revision 20260717
diff --git a/generated/google-apis-bigqueryreservation_v1/Gemfile.lock b/generated/google-apis-bigqueryreservation_v1/Gemfile.lock
index 787f2b390ae..682a942a24c 100644
--- a/generated/google-apis-bigqueryreservation_v1/Gemfile.lock
+++ b/generated/google-apis-bigqueryreservation_v1/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    google-apis-bigqueryreservation_v1 (0.55.0)
+    google-apis-bigqueryreservation_v1 (0.56.0)
       google-apis-core (>= 0.15.0, < 2.a)
 
 GEM
@@ -97,43 +97,43 @@ DEPENDENCIES
   yard (~> 0.9, >= 0.9.25)
 
 CHECKSUMS
-  addressable (2.9.0)
-  base64 (0.3.0)
+  addressable (2.9.0) sha256=7fdf6ac3660f7f4e867a0838be3f6cf722ace541dd97767fa42bc6cfa980c7af
+  base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   bundler (4.0.14) sha256=d09a0a965cf772266a7e49e83610be7c2f4e49e61134c42a56804bb383cc24b8
-  declarative (0.0.20)
-  diff-lcs (1.6.2)
-  faraday (2.14.3)
-  faraday-follow_redirects (0.5.0)
-  faraday-net_http (3.4.4)
-  google-apis-bigqueryreservation_v1 (0.55.0)
-  google-apis-core (1.2.1)
-  google-cloud-env (2.3.1)
-  google-logging-utils (0.2.0)
-  googleauth (1.17.1)
-  json (2.20.0)
-  jwt (3.2.0)
-  logger (1.7.0)
-  mini_mime (1.1.5)
-  multi_json (1.21.1)
-  net-http (0.9.1)
-  opencensus (0.5.0)
-  os (1.1.4)
-  pstore (0.2.1)
-  public_suffix (7.0.5)
-  rake (13.4.2)
-  redcarpet (3.6.1)
-  representable (3.2.0)
-  retriable (3.8.0)
-  rspec (3.13.2)
-  rspec-core (3.13.6)
-  rspec-expectations (3.13.5)
-  rspec-mocks (3.13.8)
-  rspec-support (3.13.7)
-  signet (0.22.0)
-  trailblazer-option (0.1.2)
-  uber (0.1.0)
-  uri (1.1.1)
-  yard (0.9.44)
+  declarative (0.0.20) sha256=8021dd6cb17ab2b61233c56903d3f5a259c5cf43c80ff332d447d395b17d9ff9
+  diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
+  faraday (2.14.3) sha256=1882247e6766615c8220b4392bf1d27f6ebb63d8e28267587cef1fb0bf37f278
+  faraday-follow_redirects (0.5.0) sha256=5cde93c894b30943a5d2b93c2fe9284216a6b756f7af406a1e55f211d97d10ad
+  faraday-net_http (3.4.4) sha256=0e78af151747ed1b00f33e25973b4bc220d7f16c00c39676817c8b12331eb588
+  google-apis-bigqueryreservation_v1 (0.56.0)
+  google-apis-core (1.2.1) sha256=3739030455277e3be90f2d07321ad4d0bf0d6b1ed820b2d092916d6cdef05337
+  google-cloud-env (2.3.1) sha256=0faac01eb27be78c2591d64433663b1a114f8f7af55a4f819755426cac9178e7
+  google-logging-utils (0.2.0) sha256=675462b4ea5affa825a3442694ca2d75d0069455a1d0956127207498fca3df7b
+  googleauth (1.17.1) sha256=0f7e6fc70e204cee1b2d71f1e1de2d3b349d432404197fe68ebf7fa23d0821b9
+  json (2.20.0) sha256=9362bc6e55a952b056abf9167cf053358181c904cb70cd6eee0808ea830fc32b
+  jwt (3.2.0) sha256=5419b1fe37b1da0982bd07051f573a8b8789ab724c2aa7e785e4784a3ed217d7
+  logger (1.7.0) sha256=196edec7cc44b66cfb40f9755ce11b392f21f7967696af15d274dde7edff0203
+  mini_mime (1.1.5) sha256=8681b7e2e4215f2a159f9400b5816d85e9d8c6c6b491e96a12797e798f8bccef
+  multi_json (1.21.1) sha256=e6126a31808e3b4d19f483c775ceac34df190dffa62adfb63a165ee14ba68080
+  net-http (0.9.1) sha256=25ba0b67c63e89df626ed8fac771d0ad24ad151a858af2cc8e6a716ca4336996
+  opencensus (0.5.0) sha256=0456d1878fd91685c21a4bfa7feac85480a0c3bc969d25550f6d3f36dd75cbba
+  os (1.1.4) sha256=57816d6a334e7bd6aed048f4b0308226c5fb027433b67d90a9ab435f35108d3f
+  pstore (0.2.1) sha256=03904d0f2c66579e96d1e6704cdabc0c88df7ea8ed8782d9f3569f6f6c702c1a
+  public_suffix (7.0.5) sha256=1a8bb08f1bbea19228d3bed6e5ed908d1cb4f7c2726d18bd9cadf60bc676f623
+  rake (13.4.2) sha256=cb825b2bd5f1f8e91ca37bddb4b9aaf345551b4731da62949be002fa89283701
+  redcarpet (3.6.1) sha256=d444910e6aa55480c6bcdc0cdb057626e8a32c054c29e793fa642ba2f155f445
+  representable (3.2.0) sha256=cc29bf7eebc31653586849371a43ffe36c60b54b0a6365b5f7d95ec34d1ebace
+  retriable (3.8.0) sha256=9f2f1b0207594c7817f17f671587b8ec7587387ac6cebda6c941a802bb98a8e5
+  rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587
+  rspec-core (3.13.6) sha256=a8823c6411667b60a8bca135364351dda34cd55e44ff94c4be4633b37d828b2d
+  rspec-expectations (3.13.5) sha256=33a4d3a1d95060aea4c94e9f237030a8f9eae5615e9bd85718fe3a09e4b58836
+  rspec-mocks (3.13.8) sha256=086ad3d3d17533f4237643de0b5c42f04b66348c28bf6b9c2d3f4a3b01af1d47
+  rspec-support (3.13.7) sha256=0640e5570872aafefd79867901deeeeb40b0c9875a36b983d85f54fb7381c47c
+  signet (0.22.0) sha256=b76d495ccb07ad35dbc89f3e920665a9d8ed717141955034005d7843dcfe4780
+  trailblazer-option (0.1.2) sha256=20e4f12ea4e1f718c8007e7944ca21a329eee4eed9e0fa5dde6e8ad8ac4344a3
+  uber (0.1.0) sha256=5beeb407ff807b5db994f82fa9ee07cfceaa561dad8af20be880bc67eba935dc
+  uri (1.1.1) sha256=379fa58d27ffb1387eaada68c749d1426738bd0f654d812fcc07e7568f5c57c6
+  yard (0.9.44) sha256=eb087e9b631ccd887b049f303d489963945452d5e2a7eb49a5a74a7cf6887f28
 
 BUNDLED WITH
   4.0.14
diff --git a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/classes.rb b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/classes.rb
index ec205adeb03..470a9dd166f 100644
--- a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/classes.rb
+++ b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/classes.rb
@@ -33,6 +33,25 @@ class Assignment
         # @return [String]
         attr_accessor :assignee
       
+        # Represents a textual expression in the Common Expression Language (CEL) syntax.
+        # CEL is a C-like expression language. The syntax and semantics of CEL are
+        # documented at https://github.com/google/cel-spec. Example (Comparison): title:
+        # "Summary size limit" description: "Determines if a summary is less than 100
+        # chars" expression: "document.summary.size() < 100" Example (Equality): title: "
+        # Requestor is owner" description: "Determines if requestor is the document
+        # owner" expression: "document.owner == request.auth.claims.email" Example (
+        # Logic): title: "Public documents" description: "Determine whether the document
+        # should be publicly visible" expression: "document.type != 'private' &&
+        # document.type != 'internal'" Example (Data Manipulation): title: "Notification
+        # string" description: "Create a notification string with a timestamp."
+        # expression: "'New message received at ' + string(document.create_time)" The
+        # exact variables and functions that may be referenced within an expression are
+        # determined by the service that evaluates it. See the service documentation for
+        # additional information.
+        # Corresponds to the JSON property `condition`
+        # @return [Google::Apis::BigqueryreservationV1::Expr]
+        attr_accessor :condition
+      
         # Optional. Deprecated: "Gemini in BigQuery" is now available by default for all
         # BigQuery editions and should not be explicitly set. Controls if "Gemini in
         # BigQuery" (https://cloud.google.com/gemini/docs/bigquery/overview) features
@@ -55,6 +74,16 @@ class Assignment
         # @return [String]
         attr_accessor :name
       
+        # Optional. Specifies the priority precedence for this assignment. Used to
+        # resolve ambiguity when multiple assignments match a single job. Higher
+        # numerical values represent higher priority (e.g., 20 is higher than 10). If
+        # unspecified, it defaults to 0. Multiple assignments can share the same
+        # precedence, but it is recommended to use unique precedence values for
+        # assignments within the same assignee scope.
+        # Corresponds to the JSON property `precedence`
+        # @return [Fixnum]
+        attr_accessor :precedence
+      
         # Optional. Represents the principal for this assignment. If not empty, jobs run
         # by this principal will utilize the associated reservation. Otherwise, jobs
         # will fall back to using the reservation assigned to the project, folder, or
@@ -88,9 +117,11 @@ def initialize(**args)
         # Update properties of this object
         def update!(**args)
           @assignee = args[:assignee] if args.key?(:assignee)
+          @condition = args[:condition] if args.key?(:condition)
           @enable_gemini_in_bigquery = args[:enable_gemini_in_bigquery] if args.key?(:enable_gemini_in_bigquery)
           @job_type = args[:job_type] if args.key?(:job_type)
           @name = args[:name] if args.key?(:name)
+          @precedence = args[:precedence] if args.key?(:precedence)
           @principal = args[:principal] if args.key?(:principal)
           @scheduling_policy = args[:scheduling_policy] if args.key?(:scheduling_policy)
           @state = args[:state] if args.key?(:state)
@@ -1055,6 +1086,11 @@ def update!(**args)
       class ReservationGroup
         include Google::Apis::Core::Hashable
       
+        # Output only. Creation time of the reservation group.
+        # Corresponds to the JSON property `creationTime`
+        # @return [String]
+        attr_accessor :creation_time
+      
         # Identifier. The resource name of the reservation group, e.g., `projects/*/
         # locations/*/reservationGroups/team1-prod`. The reservation_group_id must only
         # contain lower case alphanumeric characters or dashes. It must start with a
@@ -1070,14 +1106,24 @@ class ReservationGroup
         # @return [String]
         attr_accessor :parent_group
       
+        # Output only. Last update time of the reservation group via a user operation.
+        # This timestamp is updated only when an update operation explicitly targets
+        # this reservation group directly. It is not updated when parent or child groups
+        # are created, updated, or deleted.
+        # Corresponds to the JSON property `updateTime`
+        # @return [String]
+        attr_accessor :update_time
+      
         def initialize(**args)
            update!(**args)
         end
       
         # Update properties of this object
         def update!(**args)
+          @creation_time = args[:creation_time] if args.key?(:creation_time)
           @name = args[:name] if args.key?(:name)
           @parent_group = args[:parent_group] if args.key?(:parent_group)
+          @update_time = args[:update_time] if args.key?(:update_time)
         end
       end
       
diff --git a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/gem_version.rb b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/gem_version.rb
index b4e0352f2de..1dd498652cd 100644
--- a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/gem_version.rb
+++ b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/gem_version.rb
@@ -16,13 +16,13 @@ module Google
   module Apis
     module BigqueryreservationV1
       # Version of the google-apis-bigqueryreservation_v1 gem
-      GEM_VERSION = "0.55.0"
+      GEM_VERSION = "0.56.0"
 
       # Version of the code generator used to generate this client
       GENERATOR_VERSION = "0.19.0"
 
       # Revision of the discovery document this client was generated from
-      REVISION = "20260717"
+      REVISION = "20260819"
     end
   end
 end
diff --git a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/representations.rb b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/representations.rb
index 4274044804f..6d8fbbfc939 100644
--- a/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/representations.rb
+++ b/generated/google-apis-bigqueryreservation_v1/lib/google/apis/bigqueryreservation_v1/representations.rb
@@ -206,9 +206,12 @@ class Assignment
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
           property :assignee, as: 'assignee'
+          property :condition, as: 'condition', class: Google::Apis::BigqueryreservationV1::Expr, decorator: Google::Apis::BigqueryreservationV1::Expr::Representation
+      
           property :enable_gemini_in_bigquery, as: 'enableGeminiInBigquery'
           property :job_type, as: 'jobType'
           property :name, as: 'name'
+          property :precedence, :numeric_string => true, as: 'precedence'
           property :principal, as: 'principal'
           property :scheduling_policy, as: 'schedulingPolicy', class: Google::Apis::BigqueryreservationV1::SchedulingPolicy, decorator: Google::Apis::BigqueryreservationV1::SchedulingPolicy::Representation
       
@@ -409,8 +412,10 @@ class Representation < Google::Apis::Core::JsonRepresentation
       class ReservationGroup
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
+          property :creation_time, as: 'creationTime'
           property :name, as: 'name'
           property :parent_group, as: 'parentGroup'
+          property :update_time, as: 'updateTime'
         end
       end