diff --git a/lib/relatedFiles.js b/lib/relatedFiles.js
index 221b476..04ca901 100644
--- a/lib/relatedFiles.js
+++ b/lib/relatedFiles.js
@@ -68,8 +68,14 @@ function added(path, referencesInNode) {
    */
 function getReferences (currentNode) {
   let referencesInNode = [],
-    currentContent = currentNode.content;
-  const OASObject = parse.getOasObject(currentContent);
+    currentContent = currentNode.content,
+    OASObject;
+  if (currentNode.parsed) {
+    OASObject = currentNode.parsed;
+  }
+  else {
+    OASObject = parse.getOasObject(currentContent);
+  }
   traverseUtility(OASObject).forEach((property) => {
     if (property) {
       let hasReferenceTypeKey;
diff --git a/lib/schemaUtils.js b/lib/schemaUtils.js
index 61d416c..4c36a41 100644
--- a/lib/schemaUtils.js
+++ b/lib/schemaUtils.js
@@ -88,7 +88,9 @@ const { formatDataPath, checkIsCorrectType, isKnownType,
 
   crypto = require('crypto'),
   DEFAULT_SCHEMA_UTILS = require('./30XUtils/schemaUtils30X'),
-  { getRelatedFiles } = require('./relatedFiles');
+  { getRelatedFiles } = require('./relatedFiles'),
+  { compareVersion } = require('./common/versionUtils.js'),
+  parse = require('./parse');
   /* eslint-enable */
 
 // See https://github.com/json-schema-faker/json-schema-faker/tree/master/docs#available-options
@@ -4852,17 +4854,25 @@ module.exports = {
    * @param {object} rootFiles - rootFile:{path:string}
    * @param {array} inputData - [{path:string}]}
    * @param {string} origin -  process origin
+   * @param {string} version -  process specification version
    *
    * @returns {object} root files information and data input
    */
-  mapProcessRelatedFiles(rootFiles, inputData, origin) {
-    let data = rootFiles.map((root) => {
-      let { relatedFiles, missingRelatedFiles } = getRelatedFiles(root, inputData, origin);
-      return {
-        rootFile: { path: root.fileName },
-        relatedFiles,
-        missingRelatedFiles };
-    });
+  mapProcessRelatedFiles(rootFiles, inputData, origin, version) {
+    let parsedRootFiles = rootFiles.map((rootFile) => {
+        let parsedContent = parse.getOasObject(rootFile.content);
+        return { fileName: rootFile.fileName, content: rootFile.content, parsed: parsedContent };
+      }).filter((rootWithParsedContent) => {
+        return compareVersion(version, rootWithParsedContent.parsed.oasObject.openapi);
+      }),
+      data = parsedRootFiles.map((root) => {
+        let { relatedFiles, missingRelatedFiles } = getRelatedFiles(root, inputData, origin);
+        return {
+          rootFile: { path: root.fileName },
+          relatedFiles,
+          missingRelatedFiles
+        };
+      });
     return data;
   },
 
@@ -4890,7 +4900,7 @@ module.exports = {
       };
     if (inputRelatedFiles.rootFiles && inputRelatedFiles.rootFiles.length > 0) {
       res.output.data = this.mapProcessRelatedFiles(inputRelatedFiles.rootFiles, inputRelatedFiles.data,
-        inputRelatedFiles.origin);
+        inputRelatedFiles.origin, version);
     }
     return res;
   }
diff --git a/test/unit/detectRelatedFiles.test.js b/test/unit/detectRelatedFiles.test.js
index fd1ebbb..ddd6b18 100644
--- a/test/unit/detectRelatedFiles.test.js
+++ b/test/unit/detectRelatedFiles.test.js
@@ -7,6 +7,7 @@ let expect = require('chai').expect,
   PET_STORE_SEPARATED = '../data/petstore separate yaml/spec',
   RELATED_FILES = '../data/relatedFiles',
   PET_STORE_SEPARATED_COMMON = '../data/petstore separate yaml/common',
+  VALID_OPENAPI_31_PATH = '../data/valid_openapi31X',
   validPetstore = path.join(__dirname, VALID_OPENAPI_PATH + '/petstore.yaml'),
   petstoreSeparatedPet = path.join(__dirname, PET_STORE_SEPARATED + '/Pet.yaml'),
   petstoreSeparatedError = path.join(__dirname, PET_STORE_SEPARATED_COMMON + '/Error.yaml'),
@@ -18,10 +19,8 @@ let expect = require('chai').expect,
   internalRefOnly = path.join(__dirname, VALID_OPENAPI_PATH + '/deepObjectLengthProperty.yaml'),
   circularRef = path.join(__dirname, RELATED_FILES + '/circularRef.yaml'),
   oldPet = path.join(__dirname, RELATED_FILES + '/oldPet.yaml'),
-  pet = path.join(__dirname, RELATED_FILES + '/Pet.yaml');
-  // petstoreSeparatedJson = path.join(__dirname, PET_STORE_SEPARATED_JSON + '/swagger.json'),
-  // petstoreSeparatedPetJson = path.join(__dirname, PET_STORE_SEPARATED_JSON + '/Pet.json'),
-  // validHopService31x = path.join(__dirname, VALID_OPENAPI_31_PATH + '/yaml/hopService.yaml');
+  pet = path.join(__dirname, RELATED_FILES + '/Pet.yaml'),
+  validHopService31x = path.join(__dirname, VALID_OPENAPI_31_PATH + '/yaml/hopService.yaml');
 
 describe('detectRelatedFiles method', function() {
 
@@ -220,4 +219,52 @@ describe('detectRelatedFiles method', function() {
     expect(res.output.data[0].relatedFiles.length).to.equal(4);
     expect(res.output.data[0].missingRelatedFiles.length).to.equal(0);
   });
+
+  it('should filter root according to the version 3.1', async function() {
+    let contentFilePet = fs.readFileSync(validPetstore, 'utf8'),
+      contentFileHop = fs.readFileSync(validHopService31x, 'utf8'),
+      input = {
+        type: 'folder',
+        specificationVersion: '3.1',
+        rootFiles: [
+          {
+            path: '/petstore.yaml',
+            content: contentFilePet
+          },
+          {
+            path: '/hopService.yaml',
+            content: contentFileHop
+          }
+        ],
+        data: [
+        ]
+      };
+    const res = await Converter.detectRelatedFiles(input);
+    expect(res).to.not.be.empty;
+    expect(res.result).to.be.true;
+    expect(res.output.data[0].rootFile.path).to.equal('/hopService.yaml');
+  });
+  it('should filter root according to the version default', async function() {
+    let contentFilePet = fs.readFileSync(validPetstore, 'utf8'),
+      contentFileHop = fs.readFileSync(validHopService31x, 'utf8'),
+      input = {
+        type: 'folder',
+        rootFiles: [
+          {
+            path: '/petstore.yaml',
+            content: contentFilePet
+          },
+          {
+            path: '/hopService.yaml',
+            content: contentFileHop
+          }
+        ],
+        data: [
+        ]
+      };
+    const res = await Converter.detectRelatedFiles(input);
+    expect(res).to.not.be.empty;
+    expect(res.result).to.be.true;
+    expect(res.output.data[0].rootFile.path).to.equal('/petstore.yaml');
+  });
 });