diff --git a/paywall-js/package-lock.json b/paywall-js/package-lock.json
index e3065dd..7dc730d 100644
--- a/paywall-js/package-lock.json
+++ b/paywall-js/package-lock.json
@@ -3640,9 +3640,9 @@
       }
     },
     "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==",
       "dev": true
     },
     "log4js": {
diff --git a/paywall-js/package.json b/paywall-js/package.json
index 56d201c..8a44a82 100644
--- a/paywall-js/package.json
+++ b/paywall-js/package.json
@@ -22,7 +22,7 @@
     "karma": "^4.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-jasmine": "^2.0.1",
-    "lodash": ">=4.17.13",
+    "lodash": ">=4.17.21",
     "mixin-deep": "~> 1.3.2",
     "set-value": "~> 2.0.1"
   },