diff --git a/package.json b/package.json
index d5b2a66..7931e07 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "dependencies": {
         "bignumber.js": "^9.0.0",
         "decimal.js": "^10.2.0",
-        "lodash": "^4.17.15",
+        "lodash": "^4.17.21",
         "mz": "^2.7.0"
     },
     "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index 5f4fd0f..d8a5209 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -237,10 +237,10 @@ locate-path@^3.0.0:
     p-locate "^3.0.0"
     path-exists "^3.0.0"
 
-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@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 memorystream@^0.3.1:
   version "0.3.1"