diff --git a/yarn.lock b/yarn.lock
index 74d34a3..9da9b77 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -223,6 +223,10 @@ assertion-error@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.0.2.tgz#13ca515d86206da0bac66e834dd397d87581094c"
 
+async-limiter@~1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
+
 async@>=0.1.0, async@^2.0.0:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/async/-/async-2.5.0.tgz#843190fd6b7357a0b9e1c956edddd5ec8462b54d"
@@ -4733,8 +4737,8 @@ rx@^4.1.0:
   resolved "https://registry.yarnpkg.com/rx/-/rx-4.1.0.tgz#a5f13ff79ef3b740fe30aa803fb09f98805d4782"
 
 safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.1.tgz#893312af69b2123def71f57889001671eeb2c853"
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
 
 safe-buffer@~5.0.1:
   version "5.0.1"
@@ -5404,8 +5408,8 @@ typescript@^2.2.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.5.2.tgz#038a95f7d9bbb420b1bf35ba31d4c5c1dd3ffe34"
 
 ultron@~1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/ultron/-/ultron-1.1.0.tgz#b07a2e6a541a815fc6a34ccd4533baec307ca864"
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/ultron/-/ultron-1.1.1.tgz#9fe1536a10a664a65266a1e3ccf85fd36302bc9c"
 
 unbzip2-stream@^1.0.9:
   version "1.2.5"
@@ -5700,9 +5704,10 @@ write@^0.2.1:
     mkdirp "^0.5.1"
 
 ws@^3.0.0:
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-3.1.0.tgz#8afafecdeab46d572e5397ee880739367aa2f41c"
+  version "3.3.3"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-3.3.3.tgz#f1cf84fe2d5e901ebce94efaece785f187a228f2"
   dependencies:
+    async-limiter "~1.0.0"
     safe-buffer "~5.1.0"
     ultron "~1.1.0"