diff --git a/package-lock.json b/package-lock.json
index 16f4d9d..3145103 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5375,9 +5375,9 @@
       "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
     },
     "set-getter": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/set-getter/-/set-getter-0.1.0.tgz",
-      "integrity": "sha1-12nBgsnVpR9AkUXy+6guXoboA3Y=",
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/set-getter/-/set-getter-0.1.1.tgz",
+      "integrity": "sha512-9sVWOy+gthr+0G9DzqqLaYNA7+5OKkSmcqjL9cBpDEaZrr3ShQlyX2cZ/O/ozE41oxn/Tt0LGEM/w4Rub3A3gw==",
       "requires": {
         "to-object-path": "^0.3.0"
       }
@@ -5847,7 +5847,8 @@
     "sylvester": {
       "version": "0.0.21",
       "resolved": "https://registry.npmjs.org/sylvester/-/sylvester-0.0.21.tgz",
-      "integrity": "sha1-KYexzivS84sNzio0OIiEv6RADqc="
+      "integrity": "sha1-KYexzivS84sNzio0OIiEv6RADqc=",
+      "optional": true
     },
     "symbol-observable": {
       "version": "1.0.1",