diff --git a/yarn.lock b/yarn.lock
index e7d754c..ce7b937 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2736,7 +2736,7 @@ ember-export-application-global@^2.0.0:
   dependencies:
     ember-cli-babel "^6.0.0-beta.7"
 
-ember-fastboot-addon-tests@^0.5.1:
+ember-fastboot-addon-tests@^0.5.0:
   version "0.5.1"
   resolved "https://registry.yarnpkg.com/ember-fastboot-addon-tests/-/ember-fastboot-addon-tests-0.5.1.tgz#a0af9d9c80b97ddc3e03481c08cdc78931394642"
   integrity sha512-HpYYZ5HWp+i76wR3rJGJjDd2+YncKo5QkPiADTFkL0TdVU13yV8WowT1spxPQhtSa5N6HNQ9vcNb/ka1qIpVYQ==
@@ -7708,9 +7708,9 @@ underscore.string@^3.2.2, underscore.string@~3.3.4:
     util-deprecate "^1.0.2"
 
 underscore@>=1.8.3:
-  version "1.9.1"
-  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.9.1.tgz#06dce34a0e68a7babc29b365b8e74b8925203961"
-  integrity sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg==
+  version "1.13.1"
+  resolved "https://registry.yarnpkg.com/underscore/-/underscore-1.13.1.tgz#0c1c6bd2df54b6b69f2314066d65b6cde6fcf9d1"
+  integrity sha512-hzSoAVtJF+3ZtiFX0VgfFPHEDRm7Y/QPjGyNo4TVdnDTdft3tr8hEkD25a1jC+TjTuE7tkHGKkhwCgs9dgBB2g==
 
 union-value@^1.0.0:
   version "1.0.0"