diff --git a/README.md b/README.md
index 604efcb..fe3435d 100644
--- a/README.md
+++ b/README.md
@@ -97,6 +97,7 @@ Fetched 570 categories
 
 ## History
 
+- October 31, 2023 v1.1.2 fixing validator.swagger.io errors ([Issue #4](../../issues/4))
 - October 30, 2023 v1.1.1 [/v1/authors](https://api.zitat-service.de/v1/authors) list is now sorted by lastname first and firstname second ([Issue #4](../../issues/4))
 - October 3, 2023 v1.1.0 with additional endpoint [/v1/quote_html](https://api.zitat-service.de/v1/quote_html)
 - September 20, 2023 v1.0.0 launched with six JSON endpoints
diff --git a/package-lock.json b/package-lock.json
index 382e536..2a7ab67 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "api.zitat-service.de",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "api.zitat-service.de",
-      "version": "1.1.1",
+      "version": "1.1.2",
       "dependencies": {
         "@loopback/boot": "^6.1.1",
         "@loopback/core": "^5.1.1",
diff --git a/package.json b/package.json
index 5a6e2ff..84fdc34 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "api.zitat-service.de",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "The API provides functionality to retrieve quotes, along with related entries such as their respective authors and associated categories, from the website <a href=\"https://www.zitat-service.de\">zitat.service.de</a>. The content delivered by the API is available in five languages: English 🇺🇸, Español 🇪🇸, 日本語 🇯🇵, Українська 🇺🇦 and Deutsch 🇩🇪. While the content is multilingual, the API itself is provided only in English. You can find the open-source software project hosted on GitHub at <a href=\"https://github.com/muhme/quote_api\">github.com/muhme/quote_api</a>.",
   "keywords": [
     "loopback-application",
diff --git a/src/controllers/authors.controller.ts b/src/controllers/authors.controller.ts
index 53d2c93..858d615 100644
--- a/src/controllers/authors.controller.ts
+++ b/src/controllers/authors.controller.ts
@@ -208,17 +208,26 @@ export class AuthorsController {
   async getAuthors(
     @param.query.string('language', {
       description: 'The `language` for the author entries. See `/v1/languages` for available language codes.',
-      default: 'en'
+      schema: {
+        type: 'string',
+        default: 'en'
+      }
     }) language = 'en',
 
     @param.query.integer('page', {
       description: 'The response is made page by page, the parameter `page` controls the page number of the result. Starting with page 1.',
-      default: 1
+      schema: {
+        type: 'integer',
+        default: 1
+      }
     }) page = 1,
 
     @param.query.integer('size', {
       description: 'The response is made page by page, the parameter `size` controls how many entries are returned on a page.',
-      default: 100
+      schema: {
+        type: 'integer',
+        default: 100
+      }
     }) size = 100,
 
     @param.query.string('lastname', {
@@ -296,12 +305,18 @@ export class AuthorsController {
   async getAuthor(
     @param.query.string('language', {
       description: 'The `language` for the author entry. See `/v1/languages` for all available languages.',
-      default: 'en'
+      schema: {
+        type: 'string',
+        default: 'en'
+      }
     }) language = 'en',
 
     @param.query.integer('authorId', {
       description: 'Authors ID. For a list of all author entries with their IDs see `/v1/authors`.',
-      default: 1
+      schema: {
+        type: 'integer',
+        default: 1
+      }
     }) authorId = 1
   ): Promise<AuthorReturned | null> {
     const filter: AuthorFilter = {
diff --git a/src/controllers/categories.controller.ts b/src/controllers/categories.controller.ts
index eb15a55..0b10c86 100644
--- a/src/controllers/categories.controller.ts
+++ b/src/controllers/categories.controller.ts
@@ -123,17 +123,26 @@ export class CategoriesController {
   async getCategories(
     @param.query.string('language', {
       description: 'The language for the category entries. See `/v1/languages` for available languages.',
-      default: 'en'
+      schema: {
+        type: 'string',
+        default: 'en'
+      }
     }) language = 'en',
 
     @param.query.integer('page', {
       description: 'The response is made page by page, the parameter `page` controls the page number of the result. Starting with page 1.',
-      default: 1
+      schema: {
+        type: 'integer',
+        default: 1
+      }
     }) page = 1,
 
     @param.query.integer('size', {
       description: 'The response is made page by page, the parameter `size` controls how many entries are returned on a page.',
-      default: 100
+      schema: {
+        type: 'integer',
+        default: 100
+      }
     }) size = 100,
 
     @param.query.string('starting', {
diff --git a/src/controllers/quotation.controller.ts b/src/controllers/quotation.controller.ts
index 18a6fa6..fb00e8c 100644
--- a/src/controllers/quotation.controller.ts
+++ b/src/controllers/quotation.controller.ts
@@ -321,7 +321,10 @@ export class QuotationController {
     }) style?: string,
     @param.query.boolean('contentOnly', {
       description: DESCRIPTIONS['contentOnly'],
-      default: false
+      schema: {
+        type: 'boolean',
+        default: false
+      }
     }) contentOnly?: boolean,
     @param.query.string('target', {
       description: DESCRIPTIONS['target']
diff --git a/src/controllers/users.controller.ts b/src/controllers/users.controller.ts
index 26087c9..13ea6bd 100644
--- a/src/controllers/users.controller.ts
+++ b/src/controllers/users.controller.ts
@@ -123,12 +123,18 @@ export class UsersController {
     @param.query.integer('page', {
       description: "The response is made page by page, the optional parameter \
         `page` controls the page number of the result. Starting with page 1.",
-      default: 1
+      schema: {
+        type: 'integer',
+        default: 1
+      }
     }) page = 1,
     @param.query.integer('size', {
       description: "The response is made page by page, the optional parameter \
         `size` controls how many entries are returned on a page.",
-      default: 100
+      schema: {
+        type: 'integer',
+        default: 100
+      }
     }) size = 100,
     @param.query.string('starting', {
       description: `The beginning of the login name to limit the list for \