diff --git a/yarn.lock b/yarn.lock
index 9a2cf21..85bb410 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1145,9 +1145,9 @@ accepts@~1.3.4, accepts@~1.3.5, accepts@~1.3.7:
     negotiator "0.6.2"
 
 acorn@^6.2.1:
-  version "6.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.3.0.tgz#0087509119ffa4fc0a0041d1e93a417e68cb856e"
-  integrity sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA==
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 acorn@^7.1.0:
   version "7.1.0"
@@ -7890,7 +7890,7 @@ yn@^3.0.0:
   resolved "https://registry.yarnpkg.com/yn/-/yn-3.1.1.tgz#1e87401a09d767c1d5eab26a6e4c185182d2eb50"
   integrity sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==
 
-zone.js@~0.10.2:
-  version "0.10.2"
-  resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.10.2.tgz#67ca084b3116fc33fc40435e0d5ea40a207e392e"
-  integrity sha512-UAYfiuvxLN4oyuqhJwd21Uxb4CNawrq6fPS/05Su5L4G+1TN+HVDJMUHNMobVQDFJRir2cLAODXwluaOKB7HFg==
+zone.js@~0.9.1:
+  version "0.9.1"
+  resolved "https://registry.yarnpkg.com/zone.js/-/zone.js-0.9.1.tgz#e37c6e5c54c13fae4de26b5ffe8d8e9212da6d9b"
+  integrity sha512-GkPiJL8jifSrKReKaTZ5jkhrMEgXbXYC+IPo1iquBjayRa0q86w3Dipjn8b415jpitMExe9lV8iTsv8tk3DGag==