diff --git a/package-lock.json b/package-lock.json
index 245480462..97bde9702 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@asyncapi/parser",
-  "version": "3.0.0-next-major-spec.9",
+  "version": "3.0.0-next-major-spec.12",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@asyncapi/parser",
-      "version": "3.0.0-next-major-spec.9",
+      "version": "3.0.0-next-major-spec.12",
       "license": "Apache-2.0",
       "dependencies": {
         "@asyncapi/specs": "^6.0.0-next-major-spec.9",
diff --git a/package.json b/package.json
index 9105a10b0..f0ccfad78 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@asyncapi/parser",
-  "version": "3.0.0-next-major-spec.9",
+  "version": "3.0.0-next-major-spec.12",
   "description": "JavaScript AsyncAPI parser.",
   "bugs": {
     "url": "https://github.com/asyncapi/parser-js/issues"
diff --git a/src/document.ts b/src/document.ts
index b202b1c6a..76b0f257d 100644
--- a/src/document.ts
+++ b/src/document.ts
@@ -1,4 +1,4 @@
-import { AsyncAPIDocumentV2, AsyncAPIDocumentV3 } from './models';
+import { AsyncAPIDocumentV2, AsyncAPIDocumentV3, ParserAPIVersion } from './models';
 import { unstringify } from './stringify';
 import { createDetailedAsyncAPI } from './utils';
 
@@ -43,7 +43,7 @@ export function isAsyncAPIDocument(maybeDoc: unknown): maybeDoc is AsyncAPIDocum
   }
   if (maybeDoc && typeof (maybeDoc as AsyncAPIDocumentInterface).json === 'function') {
     const versionOfParserAPI = (maybeDoc as AsyncAPIDocumentInterface).json()[xParserApiVersion];
-    return versionOfParserAPI === 2;
+    return versionOfParserAPI === ParserAPIVersion;
   }
   return false;
 }
diff --git a/src/models/utils.ts b/src/models/utils.ts
index 2a685d5d8..fe4cf4960 100644
--- a/src/models/utils.ts
+++ b/src/models/utils.ts
@@ -1,8 +1,12 @@
 import type { BaseModel, ModelMetadata } from './base';
 import type { DetailedAsyncAPI } from '../types';
+import { SchemaInterface } from './schema';
+import { SchemaTypesToIterate, traverseAsyncApiDocument } from '../iterator';
+import { AsyncAPIDocumentInterface } from './asyncapi';
+import { SchemasInterface } from '../models';
 
 export interface Constructor<T> extends Function {
-  new (...any: any[]): T;
+  new(...any: any[]): T;
 }
 
 export type InferModelData<T> = T extends BaseModel<infer J> ? J : never;
@@ -30,3 +34,24 @@ export function objectIdFromJSONPointer(path: string, data: any): string {
   
   return data.split('/').pop().replace(/~1/, '/');
 }
+
+export function schemasFromDocument<T extends SchemasInterface>(document: AsyncAPIDocumentInterface, SchemasModel: Constructor<T>, includeComponents: boolean): T {
+  const jsonInstances: Set<any> = new Set();
+  const schemas: Set<SchemaInterface> = new Set();
+
+  function callback(schema: SchemaInterface) {
+    // comparing the reference (and not just the value) to the .json() object
+    if (!jsonInstances.has(schema.json())) {
+      jsonInstances.add(schema.json());
+      schemas.add(schema); // unique schemas 
+    }
+  }
+
+  let toIterate = Object.values(SchemaTypesToIterate);
+  if (!includeComponents) {
+    toIterate = toIterate.filter(s => s !== SchemaTypesToIterate.Components);
+  }
+  traverseAsyncApiDocument(document, callback, toIterate);
+
+  return new SchemasModel(Array.from(schemas));
+}
diff --git a/src/models/v2/asyncapi.ts b/src/models/v2/asyncapi.ts
index c7329c1b6..5cd0e8cbd 100644
--- a/src/models/v2/asyncapi.ts
+++ b/src/models/v2/asyncapi.ts
@@ -12,8 +12,8 @@ import { SecurityScheme } from './security-scheme';
 import { Schemas } from './schemas';
 
 import { extensions } from './mixins';
-import { traverseAsyncApiDocument, SchemaTypesToIterate } from '../../iterator';
 import { tilde } from '../../utils';
+import { schemasFromDocument } from '../utils';
 
 import type { AsyncAPIDocumentInterface } from '../asyncapi';
 import type { InfoInterface } from '../info';
@@ -27,7 +27,6 @@ import type { OperationInterface } from '../operation';
 import type { MessagesInterface } from '../messages';
 import type { MessageInterface } from '../message';
 import type { SchemasInterface } from '../schemas';
-import type { SchemaInterface } from '../schema';
 import type { SecuritySchemesInterface } from '../security-schemes';
 import type { ExtensionsInterface } from '../extensions';
 
@@ -81,7 +80,7 @@ export class AsyncAPIDocument extends BaseModel<v2.AsyncAPIObject> implements As
   }
 
   schemas(): SchemasInterface {
-    return this.__schemas(false);
+    return schemasFromDocument(this, Schemas, false);
   }
 
   securitySchemes(): SecuritySchemesInterface {
@@ -130,26 +129,10 @@ export class AsyncAPIDocument extends BaseModel<v2.AsyncAPIObject> implements As
   }
 
   allSchemas(): SchemasInterface {
-    return this.__schemas(true);
+    return schemasFromDocument(this, Schemas, true);
   }
 
   extensions(): ExtensionsInterface {
     return extensions(this);
   }
-
-  private __schemas(withComponents: boolean) {
-    const schemas: Set<SchemaInterface> = new Set();
-    function callback(schema: SchemaInterface) {
-      if (!schemas.has(schema.json())) {
-        schemas.add(schema);
-      }
-    }
-
-    let toIterate = Object.values(SchemaTypesToIterate);
-    if (!withComponents) {
-      toIterate = toIterate.filter(s => s !== SchemaTypesToIterate.Components);
-    }
-    traverseAsyncApiDocument(this, callback, toIterate);
-    return new Schemas(Array.from(schemas));
-  }
 }
diff --git a/src/models/v3/asyncapi.ts b/src/models/v3/asyncapi.ts
index 671616690..756140b0b 100644
--- a/src/models/v3/asyncapi.ts
+++ b/src/models/v3/asyncapi.ts
@@ -14,7 +14,7 @@ import { Schemas } from './schemas';
 
 import { extensions } from './mixins';
 import { tilde } from '../../utils';
-import { SchemaTypesToIterate, traverseAsyncApiDocument } from '../../iterator';
+import { schemasFromDocument } from '../utils';
 
 import type { AsyncAPIDocumentInterface } from '../asyncapi';
 import type { InfoInterface } from '../info';
@@ -26,12 +26,12 @@ import type { MessageInterface } from '../message';
 import type { ComponentsInterface } from '../components';
 import type { SecuritySchemesInterface } from '../security-schemes';
 import type { ExtensionsInterface } from '../extensions';
-import type { SchemaInterface } from '../schema';
 import type { SchemasInterface } from '../schemas';
+import type { OperationInterface } from '../operation';
+import type { ChannelInterface } from '../channel';
+import type { ServerInterface } from '../server';
+
 import type { v3 } from '../../spec-types';
-import { OperationInterface } from '../operation';
-import { ChannelInterface } from '../channel';
-import { ServerInterface } from '../server';
 
 export class AsyncAPIDocument extends BaseModel<v3.AsyncAPIObject> implements AsyncAPIDocumentInterface {
   version(): string {
@@ -89,8 +89,8 @@ export class AsyncAPIDocument extends BaseModel<v3.AsyncAPIObject> implements As
     return new Messages(messages);
   }
 
-  schemas() {
-    return this.__schemas(false);
+  schemas(): SchemasInterface {
+    return schemasFromDocument(this, Schemas, false);
   }
 
   securitySchemes(): SecuritySchemesInterface {
@@ -138,26 +138,10 @@ export class AsyncAPIDocument extends BaseModel<v3.AsyncAPIObject> implements As
   }
 
   allSchemas(): SchemasInterface {
-    return this.__schemas(true);
+    return schemasFromDocument(this, Schemas, true);
   }
 
   extensions(): ExtensionsInterface {
     return extensions(this);
   }
-
-  private __schemas(withComponents: boolean) {
-    const schemas: Set<SchemaInterface> = new Set();
-    function callback(schema: SchemaInterface) {
-      if (!schemas.has(schema.json())) {
-        schemas.add(schema);
-      }
-    }
-
-    let toIterate = Object.values(SchemaTypesToIterate);
-    if (!withComponents) {
-      toIterate = toIterate.filter(s => s !== SchemaTypesToIterate.Components);
-    }
-    traverseAsyncApiDocument(this, callback, toIterate);
-    return new Schemas(Array.from(schemas));
-  }
 }
diff --git a/test/document.spec.ts b/test/document.spec.ts
index dfa07761d..c9fb0e5c0 100644
--- a/test/document.spec.ts
+++ b/test/document.spec.ts
@@ -114,8 +114,12 @@ describe('utils', function() {
       expect(isAsyncAPIDocument(createAsyncAPIDocument(detailed))).toEqual(true);
     });
 
-    it('document with the x-parser-api-version extension set to 2 should be AsyncAPI document', async function() {
-      expect(isAsyncAPIDocument({ json() { return { [xParserApiVersion]: 2 }; } })).toEqual(true);
+    it('document with the x-parser-api-version extension set to 3 should be AsyncAPI document', async function() {
+      expect(isAsyncAPIDocument({ json() { return { [xParserApiVersion]: 3 }; } })).toEqual(true);
+    });
+
+    it('document with the x-parser-api-version extension set to 2 should not be AsyncAPI document', async function() {
+      expect(isAsyncAPIDocument({ json() { return { [xParserApiVersion]: 2 }; } })).toEqual(false);
     });
 
     it('document with the x-parser-api-version extension set to 1 should not be AsyncAPI document', async function() {
diff --git a/test/models/v2/asyncapi.spec.ts b/test/models/v2/asyncapi.spec.ts
index 7f89795ae..3b5146ca9 100644
--- a/test/models/v2/asyncapi.spec.ts
+++ b/test/models/v2/asyncapi.spec.ts
@@ -308,6 +308,14 @@ describe('AsyncAPIDocument model', function() {
       const d = new AsyncAPIDocument(doc);
       expect(d.allSchemas()).toBeInstanceOf(Schemas);
     });
+
+    it('should return a collection of schemas (with schemas from components) without duplicates', function() {
+      const sharedMessage = { payload: {} };
+      const doc = serializeInput<v2.AsyncAPIObject>({ channels: { 'user/signup': { publish: { message: sharedMessage }, subscribe: { message: { oneOf: [{ payload: {} }, {}] } } }, 'user/logout': { publish: { message: { payload: {} } } } }, components: { messages: { aMessage: sharedMessage } } });
+      const d = new AsyncAPIDocument(doc);
+      expect(d.allSchemas()).toBeInstanceOf(Schemas);
+      expect(d.allSchemas()).toHaveLength(3);
+    });
   });
 
   describe('mixins', function() {
diff --git a/test/models/v3/asyncapi.spec.ts b/test/models/v3/asyncapi.spec.ts
index c326796cc..85e28e371 100644
--- a/test/models/v3/asyncapi.spec.ts
+++ b/test/models/v3/asyncapi.spec.ts
@@ -213,6 +213,13 @@ describe('AsyncAPIDocument model', function() {
       const d = new AsyncAPIDocument(doc);
       expect(d.allSchemas()).toBeInstanceOf(Schemas);
     });
+    it('should return a collection of schemas (with schemas from components) without duplicates', function() {
+      const sharedMessage = { payload: {} };
+      const doc = serializeInput<v3.AsyncAPIObject>({ channels: { userSignup: { address: 'user/signup', messages: { someMessage1: { payload: {}}, someMessage2: sharedMessage } } }, components: { messages: { aMessage: sharedMessage } } });
+      const d = new AsyncAPIDocument(doc);
+      expect(d.allSchemas()).toBeInstanceOf(Schemas);
+      expect(d.allSchemas()).toHaveLength(2);
+    });
   });
 
   describe('.allServers()', function() {