diff --git a/package-lock.json b/package-lock.json
index d8e1dc6..709ca67 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -374,9 +374,9 @@
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     },
     "acorn": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
-      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA=="
+      "version": "6.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.2.tgz",
+      "integrity": "sha512-XtGIhXwF8YM8bJhGxG5kXgjkEuNGLTkoYqVE+KMR+aspr4KGYmKYg7yUe3KghyQ9yheNwLnjmzh/7+gfDBmHCQ=="
     },
     "acorn-dynamic-import": {
       "version": "4.0.0",
@@ -4881,6 +4881,7 @@
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
       "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
+      "optional": true,
       "requires": {
         "is-glob": "^2.0.0"
       }
@@ -5676,7 +5677,8 @@
     "is-extglob": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-extglob/-/is-extglob-1.0.0.tgz",
-      "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA="
+      "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA=",
+      "optional": true
     },
     "is-finite": {
       "version": "1.0.2",
@@ -5695,6 +5697,7 @@
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-2.0.1.tgz",
       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
+      "optional": true,
       "requires": {
         "is-extglob": "^1.0.0"
       }
@@ -7420,6 +7423,7 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-2.1.1.tgz",
       "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
+      "optional": true,
       "requires": {
         "remove-trailing-separator": "^1.0.1"
       }