diff --git a/package-lock.json b/package-lock.json
index 6eebeab..640aa6e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,9 +25,9 @@
       }
     },
     "acorn": {
-      "version": "6.1.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.0.tgz",
-      "integrity": "sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==",
+      "version": "6.4.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+      "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
       "dev": true
     },
     "acorn-jsx": {
@@ -1291,11 +1291,6 @@
       "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
       "dev": true
     },
-    "structure.js": {
-      "version": "0.0.2",
-      "resolved": "https://registry.npmjs.org/structure.js/-/structure.js-0.0.2.tgz",
-      "integrity": "sha1-CQ7nBBSUTl+3K2jumalmgyXMh0o="
-    },
     "supports-color": {
       "version": "5.5.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",