diff --git a/yarn.lock b/yarn.lock
index 1249e88..d8da3b0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1887,7 +1887,7 @@ hawk@~3.1.3:
     hoek "2.x.x"
     sntp "1.x.x"
 
-history@^4.6.1:
+history@4.6.1:
   version "4.6.1"
   resolved "https://registry.yarnpkg.com/history/-/history-4.6.1.tgz#911cf8eb65728555a94f2b12780a0c531a14d2fd"
   dependencies:
@@ -2644,7 +2644,7 @@ longest@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/longest/-/longest-1.0.1.tgz#30a0b2da38f73770e8294a0d22e6625ed77d0097"
 
-loose-envify@^1.0.0, loose-envify@^1.1.0, loose-envify@^1.2.0, loose-envify@^1.3.1:
+loose-envify@^1.0.0, loose-envify@^1.2.0, loose-envify@^1.3.1:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/loose-envify/-/loose-envify-1.3.1.tgz#d1a8ad33fa9ce0e713d65fdd0ac8b748d478c848"
   dependencies:
@@ -2657,8 +2657,8 @@ makeerror@1.0.x:
     tmpl "1.0.x"
 
 merge@^1.1.3:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/merge/-/merge-1.2.0.tgz#7531e39d4949c281a66b8c5a6e0265e8b05894da"
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/merge/-/merge-1.2.1.tgz#38bebf80c3220a8a487b6fcfb3941bb11720c145"
 
 micromatch@^2.1.5, micromatch@^2.3.11:
   version "2.3.11"
@@ -3068,15 +3068,6 @@ rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-dom@^15.6.1:
-  version "15.6.1"
-  resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-15.6.1.tgz#2cb0ed4191038e53c209eb3a79a23e2a4cf99470"
-  dependencies:
-    fbjs "^0.8.9"
-    loose-envify "^1.1.0"
-    object-assign "^4.1.0"
-    prop-types "^15.5.10"
-
 react-test-renderer@^15.6.1:
   version "15.6.1"
   resolved "https://registry.yarnpkg.com/react-test-renderer/-/react-test-renderer-15.6.1.tgz#026f4a5bb5552661fd2cc4bbcd0d4bc8a35ebf7e"