diff --git a/src/v1/web_risk_service_client.ts b/src/v1/web_risk_service_client.ts
index fc2b163..be8c684 100644
--- a/src/v1/web_risk_service_client.ts
+++ b/src/v1/web_risk_service_client.ts
@@ -283,7 +283,7 @@ export class WebRiskServiceClient {
   // -- Service calls --
   // -------------------
   computeThreatListDiff(
-    request: protos.google.cloud.webrisk.v1.IComputeThreatListDiffRequest,
+    request?: protos.google.cloud.webrisk.v1.IComputeThreatListDiffRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -344,7 +344,7 @@ export class WebRiskServiceClient {
    * const [response] = await client.computeThreatListDiff(request);
    */
   computeThreatListDiff(
-    request: protos.google.cloud.webrisk.v1.IComputeThreatListDiffRequest,
+    request?: protos.google.cloud.webrisk.v1.IComputeThreatListDiffRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -381,7 +381,7 @@ export class WebRiskServiceClient {
     return this.innerApiCalls.computeThreatListDiff(request, options, callback);
   }
   searchUris(
-    request: protos.google.cloud.webrisk.v1.ISearchUrisRequest,
+    request?: protos.google.cloud.webrisk.v1.ISearchUrisRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -431,7 +431,7 @@ export class WebRiskServiceClient {
    * const [response] = await client.searchUris(request);
    */
   searchUris(
-    request: protos.google.cloud.webrisk.v1.ISearchUrisRequest,
+    request?: protos.google.cloud.webrisk.v1.ISearchUrisRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -464,7 +464,7 @@ export class WebRiskServiceClient {
     return this.innerApiCalls.searchUris(request, options, callback);
   }
   searchHashes(
-    request: protos.google.cloud.webrisk.v1.ISearchHashesRequest,
+    request?: protos.google.cloud.webrisk.v1.ISearchHashesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -515,7 +515,7 @@ export class WebRiskServiceClient {
    * const [response] = await client.searchHashes(request);
    */
   searchHashes(
-    request: protos.google.cloud.webrisk.v1.ISearchHashesRequest,
+    request?: protos.google.cloud.webrisk.v1.ISearchHashesRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -550,7 +550,7 @@ export class WebRiskServiceClient {
     return this.innerApiCalls.searchHashes(request, options, callback);
   }
   createSubmission(
-    request: protos.google.cloud.webrisk.v1.ICreateSubmissionRequest,
+    request?: protos.google.cloud.webrisk.v1.ICreateSubmissionRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -606,7 +606,7 @@ export class WebRiskServiceClient {
    * const [response] = await client.createSubmission(request);
    */
   createSubmission(
-    request: protos.google.cloud.webrisk.v1.ICreateSubmissionRequest,
+    request?: protos.google.cloud.webrisk.v1.ICreateSubmissionRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
diff --git a/src/v1beta1/web_risk_service_v1_beta1_client.ts b/src/v1beta1/web_risk_service_v1_beta1_client.ts
index 34bf566..65461cb 100644
--- a/src/v1beta1/web_risk_service_v1_beta1_client.ts
+++ b/src/v1beta1/web_risk_service_v1_beta1_client.ts
@@ -274,7 +274,7 @@ export class WebRiskServiceV1Beta1Client {
   // -- Service calls --
   // -------------------
   computeThreatListDiff(
-    request: protos.google.cloud.webrisk.v1beta1.IComputeThreatListDiffRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.IComputeThreatListDiffRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -330,7 +330,7 @@ export class WebRiskServiceV1Beta1Client {
    * const [response] = await client.computeThreatListDiff(request);
    */
   computeThreatListDiff(
-    request: protos.google.cloud.webrisk.v1beta1.IComputeThreatListDiffRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.IComputeThreatListDiffRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -370,7 +370,7 @@ export class WebRiskServiceV1Beta1Client {
     return this.innerApiCalls.computeThreatListDiff(request, options, callback);
   }
   searchUris(
-    request: protos.google.cloud.webrisk.v1beta1.ISearchUrisRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.ISearchUrisRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -416,7 +416,7 @@ export class WebRiskServiceV1Beta1Client {
    * const [response] = await client.searchUris(request);
    */
   searchUris(
-    request: protos.google.cloud.webrisk.v1beta1.ISearchUrisRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.ISearchUrisRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<
@@ -451,7 +451,7 @@ export class WebRiskServiceV1Beta1Client {
     return this.innerApiCalls.searchUris(request, options, callback);
   }
   searchHashes(
-    request: protos.google.cloud.webrisk.v1beta1.ISearchHashesRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.ISearchHashesRequest,
     options?: CallOptions
   ): Promise<
     [
@@ -506,7 +506,7 @@ export class WebRiskServiceV1Beta1Client {
    * const [response] = await client.searchHashes(request);
    */
   searchHashes(
-    request: protos.google.cloud.webrisk.v1beta1.ISearchHashesRequest,
+    request?: protos.google.cloud.webrisk.v1beta1.ISearchHashesRequest,
     optionsOrCallback?:
       | CallOptions
       | Callback<