diff --git a/package-lock.json b/package-lock.json
index 8ca31c4..270d821 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,13 +1,22 @@
 {
   "name": "adventofcode",
   "version": "1.0.0",
-  "lockfileVersion": 1,
+  "lockfileVersion": 3,
   "requires": true,
-  "dependencies": {
-    "underscore": {
-      "version": "1.12.1",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.12.1.tgz",
-      "integrity": "sha512-hEQt0+ZLDVUMhebKxL4x1BTtDY7bavVofhZ9KZ4aI26X9SRaE+Y3m83XUL1UP2jn8ynjndwCCpEHdUG+9pP1Tw=="
+  "packages": {
+    "": {
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "underscore": "^1.13.8"
+      },
+      "devDependencies": {}
+    },
+    "node_modules/underscore": {
+      "version": "1.13.8",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.13.8.tgz",
+      "integrity": "sha512-DXtD3ZtEQzc7M8m4cXotyHR+FAS18C64asBYY5vqZexfYryNNnDc02W4hKg3rdQuqOYas1jkseX0+nZXjTXnvQ==",
+      "license": "MIT"
     }
   }
 }
diff --git a/package.json b/package.json
index bff506f..40dc701 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "http://adventofcode.com solutions",
   "main": "index.js",
   "dependencies": {
-    "underscore": "^1.12.1"
+    "underscore": "^1.13.8"
   },
   "devDependencies": {},
   "scripts": {