diff --git a/__tests__/index.test.js b/__tests__/index.test.js
index 2e9eec8..5d87056 100644
--- a/__tests__/index.test.js
+++ b/__tests__/index.test.js
@@ -130,6 +130,7 @@ describe('#validate', () => {
       expect(definition.openapi).toBe('3.0.0');
       expect(Object.keys(definition.paths)).toHaveLength(14);
       expect(definition.paths['/pet'].post.operationId).toBe('addPet');
+      expect(definition.paths['/pet'].post.requestBody).toStrictEqual({ $ref: '#/components/requestBodies/Pet' });
       expect(Object.keys(definition.components.requestBodies)).toHaveLength(2);
       expect(Object.keys(definition.components.securitySchemes)).toHaveLength(2);
       expect(Object.keys(definition.components.schemas)).toHaveLength(6);
@@ -145,6 +146,7 @@ describe('#validate', () => {
       expect(definition.openapi).toBe('3.0.0');
       expect(Object.keys(definition.paths)).toHaveLength(14);
       expect(definition.paths['/pet'].post.operationId).toBe('addPet');
+      expect(definition.paths['/pet'].post.requestBody).toStrictEqual({ $ref: '#/components/requestBodies/Pet' });
       expect(Object.keys(definition.components.requestBodies)).toHaveLength(2);
       expect(Object.keys(definition.components.securitySchemes)).toHaveLength(2);
       expect(Object.keys(definition.components.schemas)).toHaveLength(6);
@@ -202,6 +204,7 @@ describe('#validate', () => {
 
       expect(definition.openapi).toBe('3.0.0');
       expect(definition.paths['/pet'].post.operationId).toBe('addPet');
+      expect(definition.paths['/pet'].post.requestBody).toStrictEqual({ $ref: '#/components/requestBodies/Pet' });
       expect(Object.keys(definition.paths)).toHaveLength(14);
       expect(Object.keys(definition.components.schemas)).toHaveLength(6);
 
@@ -214,6 +217,7 @@ describe('#validate', () => {
 
       expect(definition.openapi).toBe('3.0.0');
       expect(definition.paths['/pet'].post.operationId).toBe('addPet');
+      expect(definition.paths['/pet'].post.requestBody).toStrictEqual({ $ref: '#/components/requestBodies/Pet' });
       expect(Object.keys(definition.paths)).toHaveLength(14);
       expect(Object.keys(definition.components.schemas)).toHaveLength(6);
     });
diff --git a/index.js b/index.js
index b137fe9..9f21cbf 100644
--- a/index.js
+++ b/index.js
@@ -1,8 +1,7 @@
 const fetch = require('node-fetch');
 const fs = require('fs');
-const $RefParser = require('@apidevtools/json-schema-ref-parser');
 const converter = require('swagger2openapi');
-const SwaggerParser = require('swagger-parser');
+const swaggerParser = require('@apidevtools/swagger-parser');
 const utils = require('./lib/utils');
 
 class oasNormalize {
@@ -52,7 +51,7 @@ class oasNormalize {
     if (this.cache.bundle) return Promise.resolve(this.cache.bundle);
 
     return this.load()
-      .then(schema => $RefParser.bundle(schema))
+      .then(schema => swaggerParser.bundle(schema))
       .then(bundle => {
         this.cache.bundle = bundle;
         return bundle;
@@ -63,7 +62,7 @@ class oasNormalize {
     if (this.cache.deref) return Promise.resolve(this.cache.deref);
 
     return this.load()
-      .then(schema => $RefParser.dereference(schema))
+      .then(schema => swaggerParser.dereference(schema))
       .then(dereferenced => {
         this.cache.deref = dereferenced;
         return dereferenced;
@@ -71,24 +70,31 @@ class oasNormalize {
   }
 
   async validate(convertToLatest) {
-    return this.deref().then(async schema => {
+    return this.load().then(async schema => {
       const baseVersion = parseInt(utils.version(schema), 10);
 
-      const resolve = out => {
-        if (!convertToLatest) {
-          return out;
-        }
-
-        return converter.convertObj(out, { anchors: true }).then(options => {
-          return options.openapi;
-        });
-      };
-
       if (baseVersion === 1) {
         return Promise.reject(new Error('Swagger v1.2 is unsupported.'));
       } else if (baseVersion === 2 || baseVersion === 3) {
-        return resolve(
-          await SwaggerParser.validate(schema).catch(err => {
+        // `swaggerParser.validate()` dereferences schemas at the same time as validation and does
+        // not give us an option to disable this. Since all we already have a dereferencing method
+        // on this library and our `validate()` method here just needs to tell us if the definition
+        // is valid or not we need to clone it before passing it over to `swagger-parser` so as to
+        // not run into pass-by-reference problems.
+        const clonedSchema = JSON.parse(JSON.stringify(schema));
+
+        return swaggerParser
+          .validate(clonedSchema)
+          .then(() => {
+            if (!convertToLatest) {
+              return schema;
+            }
+
+            return converter.convertObj(schema, { anchors: true }).then(options => {
+              return options.openapi;
+            });
+          })
+          .catch(err => {
             const error = new Error(err.message.replace(/\[object Object\]/g, 'Schema'));
             error.full = err;
 
@@ -108,8 +114,7 @@ class oasNormalize {
             }
 
             return Promise.reject(error);
-          })
-        );
+          });
       }
 
       return Promise.reject(new Error('The supplied API definition is unsupported.'));
diff --git a/package-lock.json b/package-lock.json
index 281d0a8..172d4f3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,17 +1,16 @@
 {
   "name": "oas-normalize",
-  "version": "3.0.4",
+  "version": "3.0.5",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "3.0.4",
+      "version": "3.0.5",
       "license": "MIT",
       "dependencies": {
-        "@apidevtools/json-schema-ref-parser": "^9.0.7",
+        "@apidevtools/swagger-parser": "^10.0.3",
         "js-yaml": "^4.1.0",
         "node-fetch": "^2.6.1",
-        "swagger-parser": "^10.0.1",
         "swagger2openapi": "^7.0.8"
       },
       "devDependencies": {
@@ -11391,9 +11390,9 @@
       }
     },
     "node_modules/openapi-types": {
-      "version": "9.1.0",
-      "resolved": "https://registry.npmjs.org/openapi-types/-/openapi-types-9.1.0.tgz",
-      "integrity": "sha512-mhXh8QN8sbErlxfxBeZ/pzgvmDn443p8CXlxwGSi2bWANZAFvjLPI0PoGjqHW+JdBbXg6uvmvM81WXaweh/SVA==",
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/openapi-types/-/openapi-types-9.2.0.tgz",
+      "integrity": "sha512-3x0gg8DxhpZ5MVki7AK6jmMdVIZASmVGo9CoUtD+nksLdkqz7EzWKdfS9Oxxq1J7idnZV0b3LjqcvizfKFySpQ==",
       "peer": true
     },
     "node_modules/optionator": {
@@ -12534,17 +12533,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/swagger-parser": {
-      "version": "10.0.3",
-      "resolved": "https://registry.npmjs.org/swagger-parser/-/swagger-parser-10.0.3.tgz",
-      "integrity": "sha512-nF7oMeL4KypldrQhac8RyHerJeGPD1p2xDh900GPvc+Nk7nWP6jX2FcC7WmkinMoAmoO774+AFXcWsW8gMWEIg==",
-      "dependencies": {
-        "@apidevtools/swagger-parser": "10.0.3"
-      },
-      "engines": {
-        "node": ">=10"
-      }
-    },
     "node_modules/swagger2openapi": {
       "version": "7.0.8",
       "resolved": "https://registry.npmjs.org/swagger2openapi/-/swagger2openapi-7.0.8.tgz",
@@ -22074,9 +22062,9 @@
       }
     },
     "openapi-types": {
-      "version": "9.1.0",
-      "resolved": "https://registry.npmjs.org/openapi-types/-/openapi-types-9.1.0.tgz",
-      "integrity": "sha512-mhXh8QN8sbErlxfxBeZ/pzgvmDn443p8CXlxwGSi2bWANZAFvjLPI0PoGjqHW+JdBbXg6uvmvM81WXaweh/SVA==",
+      "version": "9.2.0",
+      "resolved": "https://registry.npmjs.org/openapi-types/-/openapi-types-9.2.0.tgz",
+      "integrity": "sha512-3x0gg8DxhpZ5MVki7AK6jmMdVIZASmVGo9CoUtD+nksLdkqz7EzWKdfS9Oxxq1J7idnZV0b3LjqcvizfKFySpQ==",
       "peer": true
     },
     "optionator": {
@@ -22951,14 +22939,6 @@
         }
       }
     },
-    "swagger-parser": {
-      "version": "10.0.3",
-      "resolved": "https://registry.npmjs.org/swagger-parser/-/swagger-parser-10.0.3.tgz",
-      "integrity": "sha512-nF7oMeL4KypldrQhac8RyHerJeGPD1p2xDh900GPvc+Nk7nWP6jX2FcC7WmkinMoAmoO774+AFXcWsW8gMWEIg==",
-      "requires": {
-        "@apidevtools/swagger-parser": "10.0.3"
-      }
-    },
     "swagger2openapi": {
       "version": "7.0.8",
       "resolved": "https://registry.npmjs.org/swagger2openapi/-/swagger2openapi-7.0.8.tgz",
diff --git a/package.json b/package.json
index 044b52f..c9cf6df 100644
--- a/package.json
+++ b/package.json
@@ -37,10 +37,9 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@apidevtools/json-schema-ref-parser": "^9.0.7",
+    "@apidevtools/swagger-parser": "^10.0.3",
     "js-yaml": "^4.1.0",
     "node-fetch": "^2.6.1",
-    "swagger-parser": "^10.0.1",
     "swagger2openapi": "^7.0.8"
   },
   "devDependencies": {