diff --git a/package-lock.json b/package-lock.json
index 50256d5..fd3e0bc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -135,7 +135,8 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/boolean/-/boolean-2.0.2.tgz",
       "integrity": "sha512-ymsbJQlux/uogyEWfsXJUYzuyoOzPyp6NvEV71s6/ptQR7ptKO9uHF+WZL2GRATDeN52EFhNyrIu+exNZKh3Cw==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "brace-expansion": {
       "version": "1.1.11",
@@ -1244,7 +1245,8 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
       "integrity": "sha512-NuAESUOUMrlIXOfHKzD6bpPu3tYt3xvjNdRIQ+FeT0lNb4K8WR70CaDxhuNguS2XG+GjkyMwOzsN5ZktImfhLA==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "once": {
       "version": "1.4.0",
@@ -1936,9 +1938,9 @@
       "dev": true
     },
     "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.1.tgz",
+      "integrity": "sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==",
       "dev": true
     },
     "yallist": {