diff --git a/src/config/app.config.ts b/src/config/app.config.ts
index 0bfb85341..80548078a 100644
--- a/src/config/app.config.ts
+++ b/src/config/app.config.ts
@@ -7,7 +7,7 @@ import { registerAs } from '@nestjs/config';
 import * as Joi from 'joi';
 
 import { Loglevel } from './loglevel.enum';
-import { buildErrorMessage, parseOptionalInt } from './utils';
+import { buildErrorMessage, parseOptionalNumber } from './utils';
 
 export interface AppConfig {
   domain: string;
@@ -48,7 +48,7 @@ export default registerAs('appConfig', () => {
     {
       domain: process.env.HD_DOMAIN,
       rendererOrigin: process.env.HD_RENDERER_ORIGIN,
-      port: parseOptionalInt(process.env.PORT),
+      port: parseOptionalNumber(process.env.PORT),
       loglevel: process.env.HD_LOGLEVEL,
     },
     {
diff --git a/src/config/auth.config.ts b/src/config/auth.config.ts
index a9a98fa40..911a4ba40 100644
--- a/src/config/auth.config.ts
+++ b/src/config/auth.config.ts
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -9,7 +9,7 @@ import * as Joi from 'joi';
 import { GitlabScope, GitlabVersion } from './gitlab.enum';
 import {
   buildErrorMessage,
-  parseOptionalInt,
+  parseOptionalNumber,
   replaceAuthErrorsWithEnvironmentVariables,
   toArrayConfig,
 } from './utils';
@@ -346,7 +346,7 @@ export default registerAs('authConfig', () => {
     {
       session: {
         secret: process.env.HD_SESSION_SECRET,
-        lifetime: parseOptionalInt(process.env.HD_SESSION_LIFETIME),
+        lifetime: parseOptionalNumber(process.env.HD_SESSION_LIFETIME),
       },
       local: {
         enableLogin: process.env.HD_AUTH_LOCAL_ENABLE_LOGIN,
diff --git a/src/config/database.config.ts b/src/config/database.config.ts
index 2b0b2ee53..0aab632df 100644
--- a/src/config/database.config.ts
+++ b/src/config/database.config.ts
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -7,7 +7,7 @@ import { registerAs } from '@nestjs/config';
 import * as Joi from 'joi';
 
 import { DatabaseDialect } from './database-dialect.enum';
-import { buildErrorMessage, parseOptionalInt } from './utils';
+import { buildErrorMessage, parseOptionalNumber } from './utils';
 
 export interface DatabaseConfig {
   username: string;
@@ -62,7 +62,7 @@ export default registerAs('databaseConfig', () => {
       password: process.env.HD_DATABASE_PASS,
       database: process.env.HD_DATABASE_NAME,
       host: process.env.HD_DATABASE_HOST,
-      port: parseOptionalInt(process.env.HD_DATABASE_PORT),
+      port: parseOptionalNumber(process.env.HD_DATABASE_PORT),
       storage: process.env.HD_DATABASE_STORAGE,
       dialect: process.env.HD_DATABASE_DIALECT,
     },
diff --git a/src/config/hsts.config.ts b/src/config/hsts.config.ts
index f4a636e8d..1895000e8 100644
--- a/src/config/hsts.config.ts
+++ b/src/config/hsts.config.ts
@@ -1,12 +1,12 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 import { registerAs } from '@nestjs/config';
 import * as Joi from 'joi';
 
-import { buildErrorMessage, parseOptionalInt } from './utils';
+import { buildErrorMessage, parseOptionalNumber } from './utils';
 
 export interface HstsConfig {
   enable: boolean;
@@ -32,7 +32,7 @@ export default registerAs('hstsConfig', () => {
   const hstsConfig = hstsSchema.validate(
     {
       enable: process.env.HD_HSTS_ENABLE,
-      maxAgeSeconds: parseOptionalInt(process.env.HD_HSTS_MAX_AGE),
+      maxAgeSeconds: parseOptionalNumber(process.env.HD_HSTS_MAX_AGE),
       includeSubdomains: process.env.HD_HSTS_INCLUDE_SUBDOMAINS,
       preload: process.env.HD_HSTS_PRELOAD,
     },
diff --git a/src/config/note.config.ts b/src/config/note.config.ts
index 4746c3702..9217bcff5 100644
--- a/src/config/note.config.ts
+++ b/src/config/note.config.ts
@@ -6,7 +6,7 @@
 import { registerAs } from '@nestjs/config';
 import * as Joi from 'joi';
 
-import { buildErrorMessage, parseOptionalInt, toArrayConfig } from './utils';
+import { buildErrorMessage, parseOptionalNumber, toArrayConfig } from './utils';
 
 export interface NoteConfig {
   forbiddenNoteIds: string[];
@@ -29,7 +29,9 @@ export default registerAs('noteConfig', () => {
   const noteConfig = schema.validate(
     {
       forbiddenNoteIds: toArrayConfig(process.env.HD_FORBIDDEN_NOTE_IDS, ','),
-      maxDocumentLength: parseOptionalInt(process.env.HD_MAX_DOCUMENT_LENGTH),
+      maxDocumentLength: parseOptionalNumber(
+        process.env.HD_MAX_DOCUMENT_LENGTH,
+      ),
     },
     {
       abortEarly: false,
diff --git a/src/config/utils.spec.ts b/src/config/utils.spec.ts
index a807ace7a..74d3cace4 100644
--- a/src/config/utils.spec.ts
+++ b/src/config/utils.spec.ts
@@ -1,12 +1,12 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 import { Loglevel } from './loglevel.enum';
 import {
   needToLog,
-  parseOptionalInt,
+  parseOptionalNumber,
   replaceAuthErrorsWithEnvironmentVariables,
   toArrayConfig,
 } from './utils';
@@ -84,12 +84,15 @@ describe('config utils', () => {
       expect(needToLog(currentLevel, Loglevel.TRACE)).toBeTruthy();
     });
   });
-  describe('parseOptionalInt', () => {
+  describe('parseOptionalNumber', () => {
     it('returns undefined on undefined parameter', () => {
-      expect(parseOptionalInt(undefined)).toEqual(undefined);
+      expect(parseOptionalNumber(undefined)).toEqual(undefined);
     });
-    it('correctly parses a string', () => {
-      expect(parseOptionalInt('42')).toEqual(42);
+    it('correctly parses a integer string', () => {
+      expect(parseOptionalNumber('42')).toEqual(42);
+    });
+    it('correctly parses a float string', () => {
+      expect(parseOptionalNumber('3.14')).toEqual(3.14);
     });
   });
 });
diff --git a/src/config/utils.ts b/src/config/utils.ts
index cef55b2a4..6878b2874 100644
--- a/src/config/utils.ts
+++ b/src/config/utils.ts
@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
  *
  * SPDX-License-Identifier: AGPL-3.0-only
  */
@@ -113,9 +113,9 @@ function transformLoglevelToInt(loglevel: Loglevel): number {
   }
 }
 
-export function parseOptionalInt(value?: string): number | undefined {
+export function parseOptionalNumber(value?: string): number | undefined {
   if (value === undefined) {
     return undefined;
   }
-  return parseInt(value);
+  return Number(value);
 }