diff --git a/override-polymorphism/package.json b/override-polymorphism/package.json
index 63a26e6..2f54df5 100644
--- a/override-polymorphism/package.json
+++ b/override-polymorphism/package.json
@@ -31,7 +31,7 @@
     "typescript": "3.1.4"
   },
   "dependencies": {
-    "lodash": "4.17.5",
+    "lodash": "4.17.21",
     "uuid": "^3.2.1"
   },
   "jest": {
diff --git a/override-polymorphism/yarn.lock b/override-polymorphism/yarn.lock
index d0ed88f..7b84006 100644
--- a/override-polymorphism/yarn.lock
+++ b/override-polymorphism/yarn.lock
@@ -2932,18 +2932,10 @@ lodash.sortby@^4.7.0:
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
   integrity sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=
 
-lodash@4.17.5:
-  version "4.17.5"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.5.tgz#99a92d65c0272debe8c96b6057bc8fbfa3bed511"
-
-lodash@^4.17.11, lodash@^4.17.14, 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@^4.17.4, lodash@^4.3.0:
-  version "4.17.10"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+lodash@4.17.21, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.4, lodash@^4.3.0:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 log-symbols@2.2.0:
   version "2.2.0"