diff --git a/yarn.lock b/yarn.lock
index 1b3e680..b2d8be4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -129,8 +129,8 @@ rxjs@^5.0.1:
     symbol-observable "^1.0.1"
 
 sprintf-js@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.1.2.tgz#da1765262bf8c0f571749f2ad6c26300207ae673"
 
 symbol-observable@^1.0.1:
   version "1.0.4"
@@ -153,8 +153,8 @@ typescript@^2.1.1:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.1.4.tgz#b53b69fb841126acb1dd4b397d21daba87572251"
 
 underscore.string@^3.3.4:
-  version "3.3.4"
-  resolved "https://registry.yarnpkg.com/underscore.string/-/underscore.string-3.3.4.tgz#2c2a3f9f83e64762fdc45e6ceac65142864213db"
+  version "3.3.5"
+  resolved "https://registry.yarnpkg.com/underscore.string/-/underscore.string-3.3.5.tgz#fc2ad255b8bd309e239cbc5816fd23a9b7ea4023"
   dependencies:
     sprintf-js "^1.0.3"
     util-deprecate "^1.0.2"