diff --git a/yarn.lock b/yarn.lock
index fda63e4..1c58400 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1234,7 +1234,14 @@ create-react-class@^15.6.0:
     loose-envify "^1.3.1"
     object-assign "^4.1.1"
 
-cross-spawn@5.1.0, cross-spawn@^5.0.1:
+cross-env@^5.0.5:
+  version "5.0.5"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.0.5.tgz#4383d364d9660873dd185b398af3bfef5efffef3"
+  dependencies:
+    cross-spawn "^5.1.0"
+    is-windows "^1.0.0"
+
+cross-spawn@5.1.0, cross-spawn@^5.0.1, cross-spawn@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
   dependencies:
@@ -2266,6 +2273,10 @@ is-utf8@^0.2.0:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-utf8/-/is-utf8-0.2.1.tgz#4b0da1442104d1b336340e80797e865cf39f7d72"
 
+is-windows@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.1.tgz#310db70f742d259a16a369202b51af84233310d9"
+
 isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"