diff --git a/src/utils/convertSpec.ts b/src/utils/convertSpec.ts
index 6d7547c7..88ac0da5 100644
--- a/src/utils/convertSpec.ts
+++ b/src/utils/convertSpec.ts
@@ -1,24 +1,8 @@
 import { convertObj } from 'swagger2openapi';
-
-const swagger2OpenAPICommon = require('swagger2openapi/common');
 import { OpenAPISpec } from '../types';
 
-// temporarily monkey-patch sha256 from swagger2openapi package with simpler hash function
-// to not include 300KB crypto module polyfill into bundle
-// TODO: remove when https://github.com/Mermade/swagger2openapi/pull/37 is merged
-swagger2OpenAPICommon.sha256 = function(s) {
-  let hash = 0;
-  let chr;
-  if (s.length === 0) return hash;
-  for (let i = 0; i < s.length; i++) {
-    chr = s.charCodeAt(i);
-    hash = (hash << 5) - hash + chr;
-    hash |= 0; // Convert to 32bit integer
-  }
-  return hash;
-};
-
 export function convertSwagger2OpenAPI(spec: any): Promise<OpenAPISpec> {
+  console.warn('[ReDoc Compatibility mode]: Converting OpenAPI 2.0 to OpenAPI 3.0');
   return new Promise<OpenAPISpec>((resolve, reject) =>
     convertObj(spec, {}, (err, res) => {
       // TODO: log any warnings
diff --git a/webpack.config.js b/webpack.config.js
index a8ada030..8408db84 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -42,7 +42,6 @@ module.exports = env => {
 
     node: {
       fs: 'empty',
-      crypto: 'empty',
     },
 
     externals: {