diff --git a/yarn.lock b/yarn.lock
index 7039e39..9850765 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1244,9 +1244,24 @@ core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cross-spawn@^5.1.0, cross-spawn@~5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
+create-react-class@^15.6.0:
+  version "15.6.2"
+  resolved "https://registry.yarnpkg.com/create-react-class/-/create-react-class-15.6.2.tgz#cf1ed15f12aad7f14ef5f2dfe05e6c42f91ef02a"
+  dependencies:
+    fbjs "^0.8.9"
+    loose-envify "^1.3.1"
+    object-assign "^4.1.1"
+
+cross-env@^5.1.4:
+  version "5.1.4"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.1.4.tgz#f61c14291f7cc653bb86457002ea80a04699d022"
+  dependencies:
+    cross-spawn "^5.1.0"
+    is-windows "^1.0.0"
+
+cross-spawn@^4.0.0, cross-spawn@~4.0.0:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-4.0.2.tgz#7b9247621c23adfdd3856004a823cbe397424d41"
   dependencies:
     lru-cache "^4.0.1"
     shebang-command "^1.2.0"
@@ -2532,6 +2547,10 @@ 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 "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.2.tgz#d1850eb9791ecd18e6182ce12a30f396634bb19d"
+
 isarray@1.0.0, isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"