diff --git a/package-lock.json b/package-lock.json
index 82985fe..974529a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -124,7 +124,8 @@
     "acorn": {
       "version": "2.7.0",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
-      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc="
+      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc=",
+      "optional": true
     },
     "acorn-globals": {
       "version": "1.0.9",
@@ -728,7 +729,8 @@
     "cssom": {
       "version": "0.3.8",
       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.8.tgz",
-      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg=="
+      "integrity": "sha512-b0tGHbfegbhPJpxpiBPU2sCkigAqtM9O121le6bbOlgyV+NyGyCmVfJ6QW9eRjz8CpNfWEOYBIMIGRYkLwsIYg==",
+      "optional": true
     },
     "cssstyle": {
       "version": "0.2.37",
@@ -1314,9 +1316,9 @@
       }
     },
     "http-proxy": {
-      "version": "1.18.0",
-      "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.0.tgz",
-      "integrity": "sha512-84I2iJM/n1d4Hdgc6y2+qY5mDaz2PUVjlg9znE9byl+q0uC3DeByqBGReQu5tpLK0TAqTIXScRUV+dg7+bUPpQ==",
+      "version": "1.18.1",
+      "resolved": "https://registry.npmjs.org/http-proxy/-/http-proxy-1.18.1.tgz",
+      "integrity": "sha512-7mz/721AbnJwIVbnaSv1Cz3Am0ZLT/UBwkC92VlxhXv/k/BBQfM2fXElQNC27BVGr0uwUpplYPQM9LnaBMR5NQ==",
       "requires": {
         "eventemitter3": "^4.0.0",
         "follow-redirects": "^1.0.0",
@@ -2141,7 +2143,8 @@
     "prelude-ls": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
+      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+      "optional": true
     },
     "prepend-http": {
       "version": "2.0.0",
@@ -2731,6 +2734,7 @@
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "optional": true,
       "requires": {
         "prelude-ls": "~1.1.2"
       }