diff --git a/package.json b/package.json
index 29cd1e0..d09183b 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "*",
-    "@mate-academy/scripts": "^0.3.5",
+    "@mate-academy/scripts": "^0.6.4",
     "eslint": "^5.16.0",
     "eslint-plugin-jest": "^22.4.1",
     "eslint-plugin-node": "^8.0.1",
diff --git a/src/deepEqual.js b/src/deepEqual.js
index 860208b..9f96c9c 100644
--- a/src/deepEqual.js
+++ b/src/deepEqual.js
@@ -21,6 +21,26 @@
  */
 function deepEqual(a, b) {
   // write code here
-}
+  if (Object.is(a, b)) {
+    return true;
+  }
+
+  if (a === null || b === null) {
+    return false;
+  }
+
+  if (typeof a !== 'object' || typeof b !== 'object') {
+    return false;
+  }
+
+  const aKeysArray = Object.keys(a);
+  const bKeysArray = Object.keys(b);
+
+  if (aKeysArray.length !== bKeysArray.length) {
+    return false;
+  }
+
+  return aKeysArray.every(key => deepEqual(a[key], b[key]));
+};
 
 module.exports = deepEqual;