diff --git a/src/lib/server/services/bootstrap-challenge.ts b/src/lib/server/services/bootstrap-challenge.ts
index ba95aeb..ae88a79 100644
--- a/src/lib/server/services/bootstrap-challenge.ts
+++ b/src/lib/server/services/bootstrap-challenge.ts
@@ -1,6 +1,6 @@
 import { createHash } from "node:crypto";
 
-export const NEW_CLIENT_BOOTSTRAP_DIFFICULTY = 4;
+export const NEW_CLIENT_BOOTSTRAP_DIFFICULTY = 5;
 
 export function createBootstrapBinding(input: {
   tenantId: string;
diff --git a/src/routes/api/tenants/[id]/appointments/[appointmentId]/+server.ts b/src/routes/api/tenants/[id]/appointments/[appointmentId]/+server.ts
index 507e1ea..db25a0a 100644
--- a/src/routes/api/tenants/[id]/appointments/[appointmentId]/+server.ts
+++ b/src/routes/api/tenants/[id]/appointments/[appointmentId]/+server.ts
@@ -1,12 +1,6 @@
 import { json } from "@sveltejs/kit";
 import { AppointmentService } from "$lib/server/services/appointment-service";
-import {
-  BackendError,
-  InternalError,
-  logError,
-  NotFoundError,
-  ValidationError,
-} from "$lib/server/utils/errors";
+import { BackendError, InternalError, logError, ValidationError } from "$lib/server/utils/errors";
 import type { RequestHandler } from "@sveltejs/kit";
 import { registerOpenAPIRoute } from "$lib/server/openapi";
 import logger from "$lib/logger";
diff --git a/src/routes/api/tenants/[id]/appointments/bootstrap-challenge/__tests__/bootstrap-challenge-api.test.ts b/src/routes/api/tenants/[id]/appointments/bootstrap-challenge/__tests__/bootstrap-challenge-api.test.ts
index 78399fe..472003f 100644
--- a/src/routes/api/tenants/[id]/appointments/bootstrap-challenge/__tests__/bootstrap-challenge-api.test.ts
+++ b/src/routes/api/tenants/[id]/appointments/bootstrap-challenge/__tests__/bootstrap-challenge-api.test.ts
@@ -2,6 +2,7 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import type { RequestEvent } from "@sveltejs/kit";
 import { POST } from "../+server";
+import { NEW_CLIENT_BOOTSTRAP_DIFFICULTY } from "$lib/server/services/bootstrap-challenge";
 
 vi.mock("$lib/logger", () => ({
   logger: {
@@ -60,7 +61,7 @@ describe("Bootstrap Challenge API", () => {
     expect(response.status).toBe(200);
     expect(data.challengeId).toBeTypeOf("string");
     expect(data.nonce).toBeTypeOf("string");
-    expect(data.difficulty).toBe(4);
+    expect(data.difficulty).toBe(NEW_CLIENT_BOOTSTRAP_DIFFICULTY);
     expect(challengeStore.store).toHaveBeenCalledOnce();
   });
 
diff --git a/src/routes/api/tenants/[id]/appointments/bootstrap-verify/__tests__/bootstrap-verify-api.test.ts b/src/routes/api/tenants/[id]/appointments/bootstrap-verify/__tests__/bootstrap-verify-api.test.ts
index 51b07f0..1fdf287 100644
--- a/src/routes/api/tenants/[id]/appointments/bootstrap-verify/__tests__/bootstrap-verify-api.test.ts
+++ b/src/routes/api/tenants/[id]/appointments/bootstrap-verify/__tests__/bootstrap-verify-api.test.ts
@@ -2,7 +2,10 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import type { RequestEvent } from "@sveltejs/kit";
 import { POST } from "../+server";
-import { createBootstrapPowDigest } from "$lib/server/services/bootstrap-challenge";
+import {
+  createBootstrapPowDigest,
+  NEW_CLIENT_BOOTSTRAP_DIFFICULTY,
+} from "$lib/server/services/bootstrap-challenge";
 
 vi.mock("$lib/logger", () => ({
   logger: {
@@ -70,7 +73,7 @@ describe("Bootstrap Verify API", () => {
         counter,
       });
 
-      if (digest.startsWith("0000")) {
+      if (digest.startsWith("0".repeat(NEW_CLIENT_BOOTSTRAP_DIFFICULTY))) {
         return counter;
       }
     }