diff --git a/core/src/main/java/google/registry/reporting/billing/PublishInvoicesAction.java b/core/src/main/java/google/registry/reporting/billing/PublishInvoicesAction.java
index b12e30bd9..27b16e658 100644
--- a/core/src/main/java/google/registry/reporting/billing/PublishInvoicesAction.java
+++ b/core/src/main/java/google/registry/reporting/billing/PublishInvoicesAction.java
@@ -23,16 +23,17 @@ import static javax.servlet.http.HttpServletResponse.SC_OK;
 
 import com.google.api.services.dataflow.Dataflow;
 import com.google.api.services.dataflow.model.Job;
-import com.google.appengine.api.taskqueue.QueueFactory;
-import com.google.appengine.api.taskqueue.TaskOptions;
+import com.google.common.collect.ImmutableMultimap;
 import com.google.common.flogger.FluentLogger;
 import com.google.common.net.MediaType;
 import google.registry.config.RegistryConfig.Config;
 import google.registry.reporting.ReportingModule;
 import google.registry.request.Action;
+import google.registry.request.Action.Service;
 import google.registry.request.Parameter;
 import google.registry.request.Response;
 import google.registry.request.auth.Auth;
+import google.registry.util.CloudTasksUtils;
 import java.io.IOException;
 import javax.inject.Inject;
 import org.joda.time.YearMonth;
@@ -65,6 +66,7 @@ public class PublishInvoicesAction implements Runnable {
   private final Dataflow dataflow;
   private final Response response;
   private final YearMonth yearMonth;
+  private final CloudTasksUtils cloudTasksUtils;
 
   @Inject
   PublishInvoicesAction(
@@ -74,7 +76,8 @@ public class PublishInvoicesAction implements Runnable {
       BillingEmailUtils emailUtils,
       Dataflow dataflow,
       Response response,
-      YearMonth yearMonth) {
+      YearMonth yearMonth,
+      CloudTasksUtils cloudTasksUtils) {
     this.projectId = projectId;
     this.jobRegion = jobRegion;
     this.jobId = jobId;
@@ -82,6 +85,7 @@ public class PublishInvoicesAction implements Runnable {
     this.dataflow = dataflow;
     this.response = response;
     this.yearMonth = yearMonth;
+    this.cloudTasksUtils = cloudTasksUtils;
   }
 
   static final String PATH = "/_dr/task/publishInvoices";
@@ -119,10 +123,11 @@ public class PublishInvoicesAction implements Runnable {
   }
 
   private void enqueueCopyDetailReportsTask() {
-    TaskOptions copyDetailTask =
-        TaskOptions.Builder.withUrl(CopyDetailReportsAction.PATH)
-            .method(TaskOptions.Method.POST)
-            .param(PARAM_YEAR_MONTH, yearMonth.toString());
-    QueueFactory.getQueue(BillingModule.CRON_QUEUE).add(copyDetailTask);
+    cloudTasksUtils.enqueue(
+        BillingModule.CRON_QUEUE,
+        CloudTasksUtils.createPostTask(
+            CopyDetailReportsAction.PATH,
+            Service.BACKEND.toString(),
+            ImmutableMultimap.of(PARAM_YEAR_MONTH, yearMonth.toString())));
   }
 }
diff --git a/core/src/test/java/google/registry/reporting/billing/PublishInvoicesActionTest.java b/core/src/test/java/google/registry/reporting/billing/PublishInvoicesActionTest.java
index b8c38e922..8ae7b8f3d 100644
--- a/core/src/test/java/google/registry/reporting/billing/PublishInvoicesActionTest.java
+++ b/core/src/test/java/google/registry/reporting/billing/PublishInvoicesActionTest.java
@@ -15,7 +15,6 @@
 package google.registry.reporting.billing;
 
 import static com.google.common.truth.Truth.assertThat;
-import static google.registry.testing.TaskQueueHelper.assertTasksEnqueued;
 import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
 import static javax.servlet.http.HttpServletResponse.SC_NOT_MODIFIED;
 import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT;
@@ -30,10 +29,13 @@ import com.google.api.services.dataflow.Dataflow.Projects.Locations;
 import com.google.api.services.dataflow.Dataflow.Projects.Locations.Jobs;
 import com.google.api.services.dataflow.Dataflow.Projects.Locations.Jobs.Get;
 import com.google.api.services.dataflow.model.Job;
+import com.google.cloud.tasks.v2.HttpMethod;
 import com.google.common.net.MediaType;
 import google.registry.testing.AppEngineExtension;
+import google.registry.testing.CloudTasksHelper;
+import google.registry.testing.CloudTasksHelper.TaskMatcher;
 import google.registry.testing.FakeResponse;
-import google.registry.testing.TaskQueueHelper.TaskMatcher;
+import google.registry.util.CloudTasksUtils;
 import java.io.IOException;
 import org.joda.time.YearMonth;
 import org.junit.jupiter.api.BeforeEach;
@@ -51,6 +53,8 @@ class PublishInvoicesActionTest {
   private final Job expectedJob = new Job();
   private final BillingEmailUtils emailUtils = mock(BillingEmailUtils.class);
   private final FakeResponse response = new FakeResponse();
+  private final CloudTasksHelper cloudTasksHelper = new CloudTasksHelper();
+  private final CloudTasksUtils cloudTasksUtils = cloudTasksHelper.getTestCloudTasksUtils();
   private PublishInvoicesAction uploadAction;
 
   @RegisterExtension
@@ -72,7 +76,8 @@ class PublishInvoicesActionTest {
             emailUtils,
             dataflow,
             response,
-            new YearMonth(2017, 10));
+            new YearMonth(2017, 10),
+            cloudTasksUtils);
   }
 
   @Test
@@ -84,9 +89,9 @@ class PublishInvoicesActionTest {
     TaskMatcher matcher =
         new TaskMatcher()
             .url("/_dr/task/copyDetailReports")
-            .method("POST")
+            .method(HttpMethod.POST)
             .param("yearMonth", "2017-10");
-    assertTasksEnqueued("retryable-cron-tasks", matcher);
+    cloudTasksHelper.assertTasksEnqueued("retryable-cron-tasks", matcher);
   }
 
   @Test