diff --git a/package-lock.json b/package-lock.json
index 2c6dcc0..ecb01c3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1398,6 +1398,11 @@
       "integrity": "sha1-6PvzdNxVb/iUehDcsFctYz8s+hA=",
       "dev": true
     },
+    "iso8601-duration": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/iso8601-duration/-/iso8601-duration-1.2.0.tgz",
+      "integrity": "sha512-ErTBd++b17E8nmWII1K1uZtBgD1E8RjyvwmxlCjPHNqHMD7gmcMHOw0E8Ro/6+QT4PhHRSnnMo7bxa1vFPkwhg=="
+    },
     "isstream": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz",