diff --git a/package-lock.json b/package-lock.json
index bd7b6d4..d6c1fdf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -31,9 +31,9 @@
       }
     },
     "acorn": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.1.tgz",
-      "integrity": "sha512-JD0xT5FCRDNyjDda3Lrg/IxFscp9q4tiYtxE1/nOzlKCk7hIRuYjhq1kCNkbPjMRMZuFq20HNQn1I9k8Oj0E+Q==",
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
     "acorn-globals": {
@@ -3215,7 +3215,6 @@
       "version": "1.9.0",
       "resolved": "https://registry.npmjs.org/registry-js/-/registry-js-1.9.0.tgz",
       "integrity": "sha512-0jI9iHxcfHvUSqYtfCc3oshbMQ3VqVLqvUD59Jjgoo+dsHNeJWBWXnOxRw2ZgFcNfdOmyPU9ClhKSDS9OvodBA==",
-      "dev": true,
       "requires": {
         "nan": "^2.10.0",
         "prebuild-install": "^5.2.4"