diff --git a/examples/express-service/package.json b/examples/express-service/package.json
index 2375c398..99ba509d 100644
--- a/examples/express-service/package.json
+++ b/examples/express-service/package.json
@@ -4,7 +4,7 @@
     "@types/node": "^13.13.4",
     "bluzelle": "^2.0.1",
     "express": "^4.17.1",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "ts-node": "^8.10.1",
     "typescript": "^3.8.3"
   },
diff --git a/examples/express-service/yarn.lock b/examples/express-service/yarn.lock
index 4e494b2f..b5aa8c05 100644
--- a/examples/express-service/yarn.lock
+++ b/examples/express-service/yarn.lock
@@ -480,10 +480,10 @@ linked-list@^2.1.0:
   resolved "https://registry.yarnpkg.com/linked-list/-/linked-list-2.1.0.tgz#fa7b63a6caf4b17862a1eb90d14ead4ee57649f2"
   integrity sha512-0GK/ylO6e5cv1PCOIdTRHxOaCgQ+0jKwHt+cHzkiCAZlx0KM5Id1bBAPad6g2mkvBNp1pNdmG0cohFGfqjkv9A==
 
-lodash@^4.17.15:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+lodash@^4.17.15, lodash@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 make-error@^1.1.1:
   version "1.3.6"