diff --git a/part4/package-lock.json b/part4/package-lock.json
index 8b45f90..986fcaf 100644
--- a/part4/package-lock.json
+++ b/part4/package-lock.json
@@ -4531,9 +4531,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lodash.foreach": {
       "version": "4.5.0",
diff --git a/part4/package.json b/part4/package.json
index 2c3a163..4ac0568 100644
--- a/part4/package.json
+++ b/part4/package.json
@@ -19,7 +19,7 @@
     "express": "^4.17.1",
     "express-async-errors": "^3.1.1",
     "jsonwebtoken": "^8.5.1",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "mongoose": "^5.9.19",
     "mongoose-unique-validator": "^2.0.3"
   },