diff --git a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/knowledge_base.proto b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/knowledge_base.proto
index 71e72dcc5a3..09b5c61c082 100644
--- a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/knowledge_base.proto
+++ b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/knowledge_base.proto
@@ -156,12 +156,12 @@ message ListKnowledgeBasesRequest {
     }
   ];
 
-  // Optional. The maximum number of items to return in a single page. By
+  // The maximum number of items to return in a single page. By
   // default 10 and at most 100.
-  int32 page_size = 2 [(google.api.field_behavior) = OPTIONAL];
+  int32 page_size = 2;
 
-  // Optional. The next_page_token value returned from a previous list request.
-  string page_token = 3 [(google.api.field_behavior) = OPTIONAL];
+  // The next_page_token value returned from a previous list request.
+  string page_token = 3;
 }
 
 // Response message for [KnowledgeBases.ListKnowledgeBases][google.cloud.dialogflow.v2beta1.KnowledgeBases.ListKnowledgeBases].
@@ -214,7 +214,7 @@ message DeleteKnowledgeBaseRequest {
 
   // Optional. Force deletes the knowledge base. When set to true, any documents
   // in the knowledge base are also deleted.
-  bool force = 2;
+  bool force = 2 [(google.api.field_behavior) = OPTIONAL];
 }
 
 // Request message for [KnowledgeBases.UpdateKnowledgeBase][google.cloud.dialogflow.v2beta1.KnowledgeBases.UpdateKnowledgeBase].
diff --git a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/session.proto b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/session.proto
index 2505b6760fd..d38a362ecdd 100644
--- a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/session.proto
+++ b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/session.proto
@@ -23,6 +23,7 @@ import "google/api/resource.proto";
 import "google/cloud/dialogflow/v2beta1/agent.proto";
 import "google/cloud/dialogflow/v2beta1/audio_config.proto";
 import "google/cloud/dialogflow/v2beta1/context.proto";
+import "google/cloud/dialogflow/v2beta1/gcs.proto";
 import "google/cloud/dialogflow/v2beta1/intent.proto";
 import "google/cloud/dialogflow/v2beta1/session_entity_type.proto";
 import "google/protobuf/duration.proto";
diff --git a/packages/google-cloud-dialogflow/protos/protos.json b/packages/google-cloud-dialogflow/protos/protos.json
index 525fa09f4dc..1b37a49e38c 100644
--- a/packages/google-cloud-dialogflow/protos/protos.json
+++ b/packages/google-cloud-dialogflow/protos/protos.json
@@ -6666,17 +6666,11 @@
                         },
                         "pageSize": {
                           "type": "int32",
-                          "id": 2,
-                          "options": {
-                            "(google.api.field_behavior)": "OPTIONAL"
-                          }
+                          "id": 2
                         },
                         "pageToken": {
                           "type": "string",
-                          "id": 3,
-                          "options": {
-                            "(google.api.field_behavior)": "OPTIONAL"
-                          }
+                          "id": 3
                         }
                       }
                     },
@@ -6736,7 +6730,10 @@
                         },
                         "force": {
                           "type": "bool",
-                          "id": 2
+                          "id": 2,
+                          "options": {
+                            "(google.api.field_behavior)": "OPTIONAL"
+                          }
                         }
                       }
                     },
diff --git a/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts b/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
index 8791d2acd5f..465375c0e14 100644
--- a/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
+++ b/packages/google-cloud-dialogflow/src/v2beta1/knowledge_bases_client.ts
@@ -599,7 +599,7 @@ export class KnowledgeBasesClient {
    * @param {string} request.name
    *   Required. The name of the knowledge base to delete.
    *   Format: `projects/<Project ID>/knowledgeBases/<Knowledge Base ID>`.
-   * @param {boolean} request.force
+   * @param {boolean} [request.force]
    *   Optional. Force deletes the knowledge base. When set to true, any documents
    *   in the knowledge base are also deleted.
    * @param {object} [options]
@@ -799,11 +799,11 @@ export class KnowledgeBasesClient {
    * @param {string} request.parent
    *   Required. The project to list of knowledge bases for.
    *   Format: `projects/<Project ID>`.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
    *   default 10 and at most 100.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
    * @param {object} [options]
    *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
    * @returns {Promise} - The promise which resolves to an array.
@@ -885,11 +885,11 @@ export class KnowledgeBasesClient {
    * @param {string} request.parent
    *   Required. The project to list of knowledge bases for.
    *   Format: `projects/<Project ID>`.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
    *   default 10 and at most 100.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
    * @param {object} [options]
    *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
    * @returns {Stream}
@@ -927,11 +927,11 @@ export class KnowledgeBasesClient {
    * @param {string} request.parent
    *   Required. The project to list of knowledge bases for.
    *   Format: `projects/<Project ID>`.
-   * @param {number} [request.pageSize]
-   *   Optional. The maximum number of items to return in a single page. By
+   * @param {number} request.pageSize
+   *   The maximum number of items to return in a single page. By
    *   default 10 and at most 100.
-   * @param {string} [request.pageToken]
-   *   Optional. The next_page_token value returned from a previous list request.
+   * @param {string} request.pageToken
+   *   The next_page_token value returned from a previous list request.
    * @param {object} [options]
    *   Call options. See {@link https://googleapis.dev/nodejs/google-gax/latest/interfaces/CallOptions.html|CallOptions} for more details.
    * @returns {Object}
diff --git a/packages/google-cloud-dialogflow/synth.metadata b/packages/google-cloud-dialogflow/synth.metadata
index 805e3019d8a..5b2d40ad04c 100644
--- a/packages/google-cloud-dialogflow/synth.metadata
+++ b/packages/google-cloud-dialogflow/synth.metadata
@@ -4,15 +4,15 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dialogflow.git",
-        "sha": "3cba5aa9f4cf11f586b114c2a03757a3f7409dcf"
+        "sha": "fc7565994a009a64c703b3da2a36a0e946e96a0f"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "791be5a40033c18034afed50232daad6bdc8cf3e",
-        "internalRef": "331627223"
+        "sha": "470d84e263c833af5280753b8e4188432b8d5b06",
+        "internalRef": "333132625"
       }
     },
     {