diff --git a/package-lock.json b/package-lock.json
index b59c51f..b19cd6e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -399,9 +399,9 @@
       "dev": true
     },
     "lodash": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz",
-      "integrity": "sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y="
+      "version": "4.17.21",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lolex": {
       "version": "1.3.2",
diff --git a/package.json b/package.json
index 143876a..c6bac8e 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
   "license": "ISC",
   "dependencies": {
     "agentkeepalive": "^4.2.1",
-    "lodash": "^3.9.3",
+    "lodash": "^4.17.21",
     "nodeify": "^1.0.1",
     "request": "^2.73.0"
   },