diff --git a/api_names_out.yaml b/api_names_out.yaml
index 125d17fea..e211f51fc 100644
--- a/api_names_out.yaml
+++ b/api_names_out.yaml
@@ -61036,6 +61036,7 @@
 "/dataflow:v1b3/ConcatPosition/index": index
 "/dataflow:v1b3/ConcatPosition/position": position
 "/dataflow:v1b3/ContainerSpec": container_spec
+"/dataflow:v1b3/ContainerSpec/defaultEnvironment": default_environment
 "/dataflow:v1b3/ContainerSpec/image": image
 "/dataflow:v1b3/ContainerSpec/metadata": metadata
 "/dataflow:v1b3/ContainerSpec/sdkInfo": sdk_info
@@ -61165,6 +61166,8 @@
 "/dataflow:v1b3/ExecutionStageSummary/name": name
 "/dataflow:v1b3/ExecutionStageSummary/outputSource": output_source
 "/dataflow:v1b3/ExecutionStageSummary/outputSource/output_source": output_source
+"/dataflow:v1b3/ExecutionStageSummary/prerequisiteStage": prerequisite_stage
+"/dataflow:v1b3/ExecutionStageSummary/prerequisiteStage/prerequisite_stage": prerequisite_stage
 "/dataflow:v1b3/FailedLocation": failed_location
 "/dataflow:v1b3/FailedLocation/name": name
 "/dataflow:v1b3/FileIODetails": file_io_details
diff --git a/generated/google/apis/dataflow_v1b3.rb b/generated/google/apis/dataflow_v1b3.rb
index ccf70db55..79e3dcf02 100644
--- a/generated/google/apis/dataflow_v1b3.rb
+++ b/generated/google/apis/dataflow_v1b3.rb
@@ -25,7 +25,7 @@ module Google
     # @see https://cloud.google.com/dataflow
     module DataflowV1b3
       VERSION = 'V1b3'
-      REVISION = '20200916'
+      REVISION = '20201016'
 
       # View and manage your data across Google Cloud Platform services
       AUTH_CLOUD_PLATFORM = 'https://www.googleapis.com/auth/cloud-platform'
diff --git a/generated/google/apis/dataflow_v1b3/classes.rb b/generated/google/apis/dataflow_v1b3/classes.rb
index a8a87d94e..7827994ea 100644
--- a/generated/google/apis/dataflow_v1b3/classes.rb
+++ b/generated/google/apis/dataflow_v1b3/classes.rb
@@ -514,6 +514,11 @@ module Google
       class ContainerSpec
         include Google::Apis::Core::Hashable
       
+        # The environment values to be set at runtime for flex template.
+        # Corresponds to the JSON property `defaultEnvironment`
+        # @return [Google::Apis::DataflowV1b3::FlexTemplateRuntimeEnvironment]
+        attr_accessor :default_environment
+      
         # Name of the docker container image. E.g., gcr.io/project/some-image
         # Corresponds to the JSON property `image`
         # @return [String]
@@ -535,6 +540,7 @@ module Google
       
         # Update properties of this object
         def update!(**args)
+          @default_environment = args[:default_environment] if args.key?(:default_environment)
           @image = args[:image] if args.key?(:image)
           @metadata = args[:metadata] if args.key?(:metadata)
           @sdk_info = args[:sdk_info] if args.key?(:sdk_info)
@@ -1415,6 +1421,11 @@ module Google
         # @return [Array<Google::Apis::DataflowV1b3::StageSource>]
         attr_accessor :output_source
       
+        # Other stages that must complete before this stage can run.
+        # Corresponds to the JSON property `prerequisiteStage`
+        # @return [Array<String>]
+        attr_accessor :prerequisite_stage
+      
         def initialize(**args)
            update!(**args)
         end
@@ -1428,6 +1439,7 @@ module Google
           @kind = args[:kind] if args.key?(:kind)
           @name = args[:name] if args.key?(:name)
           @output_source = args[:output_source] if args.key?(:output_source)
+          @prerequisite_stage = args[:prerequisite_stage] if args.key?(:prerequisite_stage)
         end
       end
       
diff --git a/generated/google/apis/dataflow_v1b3/representations.rb b/generated/google/apis/dataflow_v1b3/representations.rb
index c6158981e..556dde31e 100644
--- a/generated/google/apis/dataflow_v1b3/representations.rb
+++ b/generated/google/apis/dataflow_v1b3/representations.rb
@@ -1189,6 +1189,8 @@ module Google
       class ContainerSpec
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
+          property :default_environment, as: 'defaultEnvironment', class: Google::Apis::DataflowV1b3::FlexTemplateRuntimeEnvironment, decorator: Google::Apis::DataflowV1b3::FlexTemplateRuntimeEnvironment::Representation
+      
           property :image, as: 'image'
           property :metadata, as: 'metadata', class: Google::Apis::DataflowV1b3::TemplateMetadata, decorator: Google::Apis::DataflowV1b3::TemplateMetadata::Representation
       
@@ -1426,6 +1428,7 @@ module Google
           property :name, as: 'name'
           collection :output_source, as: 'outputSource', class: Google::Apis::DataflowV1b3::StageSource, decorator: Google::Apis::DataflowV1b3::StageSource::Representation
       
+          collection :prerequisite_stage, as: 'prerequisiteStage'
         end
       end
       
diff --git a/generated/google/apis/dataflow_v1b3/synth.metadata b/generated/google/apis/dataflow_v1b3/synth.metadata
index 429012f74..c60478971 100644
--- a/generated/google/apis/dataflow_v1b3/synth.metadata
+++ b/generated/google/apis/dataflow_v1b3/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-ruby-client.git",
-        "sha": "c98c719bbab68d0890524d53f8b629d7858af9c2"
+        "sha": "79a43ec56f0591043ce631e889c3354471f07c7b"
       }
     }
   ]