diff --git a/package.json b/package.json
index 29cd1e0..47dff41 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": "^0.6.5",
     "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..27268a5 100644
--- a/src/deepEqual.js
+++ b/src/deepEqual.js
@@ -20,7 +20,26 @@
  * @return {boolean}
  */
 function deepEqual(a, b) {
-  // write code here
+  if (Object.is(a, b)) {
+    return true;
+  }
+
+  if (typeof a !== 'object' || typeof b !== 'object') {
+    return false;
+  }
+
+  if (a === null || b === null) {
+    return false;
+  }
+
+  const keysA = Object.keys(a);
+  const keysB = Object.keys(b);
+
+  if (keysA.length !== keysB.length) {
+    return false;
+  }
+
+  return keysA.every(key => deepEqual(a[key], b[key]));
 }
 
 module.exports = deepEqual;