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..f0eea7e 100644
--- a/src/deepEqual.js
+++ b/src/deepEqual.js
@@ -20,7 +20,18 @@
  * @return {boolean}
  */
 function deepEqual(a, b) {
-  // write code here
-}
+  if (Object.is(a, b)) {
+    return true;
+  }
+
+  if (a !== null && b !== null
+    && typeof a === 'object' && typeof b === 'object') {
+    if (Object.keys(a).length === Object.keys(b).length) {
+      return Object.keys(a).every(key => deepEqual(a[key], b[key]));
+    };
+  }
+
+  return false;
+};
 
 module.exports = deepEqual;