diff --git a/backend/package.json b/backend/package.json
index e69bd5aa7..933516004 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -51,8 +51,6 @@
     "class-transformer": "0.5.1",
     "class-validator": "0.14.3",
     "cli-color": "2.0.4",
-    "cookie": "1.1.1",
-    "cookie-signature": "1.2.2",
     "diff": "8.0.3",
     "file-type": "16.5.4",
     "htmlparser2": "9.1.0",
diff --git a/backend/src/sessions/session.service.spec.ts b/backend/src/sessions/session.service.spec.ts
index 2d2c6cf1f..5d1946c4a 100644
--- a/backend/src/sessions/session.service.spec.ts
+++ b/backend/src/sessions/session.service.spec.ts
@@ -7,8 +7,7 @@ import { Provider } from '@nestjs/common';
 import { ConfigModule } from '@nestjs/config';
 import { Test, TestingModule } from '@nestjs/testing';
 import { FieldNameSession, TableSession } from '@hedgedoc/database';
-import { serialize } from 'cookie';
-import { sign } from 'cookie-signature';
+import { fastifyCookie } from '@fastify/cookie';
 import type { Tracker } from 'knex-mock-client';
 import { IncomingMessage } from 'node:http';
 import { Socket } from 'node:net';
@@ -101,18 +100,22 @@ describe('SessionService', () => {
     });
     it('returns empty Optional if cookie is malformed', async () => {
       const testRequest = new IncomingMessage(mockSocket);
-      testRequest.headers.cookie = serialize(HEDGEDOC_SESSION, 'foo', {});
+      testRequest.headers.cookie = fastifyCookie.serialize(HEDGEDOC_SESSION, 'foo', {});
       expect(() => service.extractSessionIdFromRequest(testRequest)).toThrow(Error);
     });
     it('returns empty Optional if cookie has invalid signature', async () => {
       const testRequest = new IncomingMessage(mockSocket);
-      testRequest.headers.cookie = serialize(HEDGEDOC_SESSION, `s:${sessionId}:fakeSignature`, {});
+      testRequest.headers.cookie = fastifyCookie.serialize(
+        HEDGEDOC_SESSION,
+        `s:${sessionId}:fakeSignature`,
+        {},
+      );
       expect(() => service.extractSessionIdFromRequest(testRequest)).toThrow(Error);
     });
     it('returns the correct id for session id', () => {
-      const signature = sign(sessionId, authConfig.session.secret);
+      const signature = fastifyCookie.sign(sessionId, authConfig.session.secret);
       const testRequest = new IncomingMessage(mockSocket);
-      testRequest.headers.cookie = serialize(HEDGEDOC_SESSION, `s:${signature}`, {});
+      testRequest.headers.cookie = fastifyCookie.serialize(HEDGEDOC_SESSION, `s:${signature}`, {});
       expect(service.extractSessionIdFromRequest(testRequest)).toEqual(sessionId);
     });
   });
diff --git a/yarn.lock b/yarn.lock
index f4e77e9f8..b20359969 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2898,8 +2898,6 @@ __metadata:
     class-transformer: "npm:0.5.1"
     class-validator: "npm:0.14.3"
     cli-color: "npm:2.0.4"
-    cookie: "npm:1.1.1"
-    cookie-signature: "npm:1.2.2"
     diff: "npm:8.0.3"
     file-type: "npm:16.5.4"
     htmlparser2: "npm:9.1.0"
@@ -8095,13 +8093,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cookie-signature@npm:1.2.2":
-  version: 1.2.2
-  resolution: "cookie-signature@npm:1.2.2"
-  checksum: 10c0/54e05df1a293b3ce81589b27dddc445f462f6fa6812147c033350cd3561a42bc14481674e05ed14c7bd0ce1e8bb3dc0e40851bad75415733711294ddce0b7bc6
-  languageName: node
-  linkType: hard
-
 "cookie@npm:*":
   version: 1.0.1
   resolution: "cookie@npm:1.0.1"
@@ -8109,7 +8100,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"cookie@npm:1.1.1, cookie@npm:^1.0.0, cookie@npm:^1.0.1":
+"cookie@npm:^1.0.0, cookie@npm:^1.0.1":
   version: 1.1.1
   resolution: "cookie@npm:1.1.1"
   checksum: 10c0/79c4ddc0fcad9c4f045f826f42edf54bcc921a29586a4558b0898277fa89fb47be95bc384c2253f493af7b29500c830da28341274527328f18eba9f58afa112c