diff --git a/package.json b/package.json
index 64a676af..d2f70d69 100644
--- a/package.json
+++ b/package.json
@@ -55,6 +55,6 @@
     "bench-duplex": "node test/spec/coreBenchmark.js DUPLEX=yes && node test/spec/duplexBenchmark.js"
   },
   "dependencies": {
-    "deep-equal": "^1.0.1"
+    "fast-deep-equal": "^2.0.1"
   }
 }
diff --git a/src/core.ts b/src/core.ts
index 77db2e2e..5515f5dd 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -5,11 +5,7 @@
  */
 declare var require: any;
 
-const equalsOptions = { strict: true };
-const _equals = require('deep-equal');
-const areEquals = (a: any, b: any): boolean => {
-  return _equals(a, b, equalsOptions)
-}
+const areEquals = require('fast-deep-equal');
 import { PatchError, _deepClone, isInteger, unescapePathComponent, hasUndefined } from './helpers';
 
 export const JsonPatchError = PatchError;