diff --git a/yarn.lock b/yarn.lock
index 35fd99f..d2b63a3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1785,8 +1785,8 @@ css-selector-tokenizer@^0.7.0:
     regexpu-core "^1.0.0"
 
 css-what@2.1:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.0.tgz#9467d032c38cfaefb9f2d79501253062f87fa1bd"
+  version "2.1.3"
+  resolved "https://registry.yarnpkg.com/css-what/-/css-what-2.1.3.tgz#a6d7604573365fe74686c3f311c56513d88285f2"
 
 cssesc@^0.1.0:
   version "0.1.0"
@@ -2868,9 +2868,9 @@ immutable@^3.8.1:
   version "3.8.1"
   resolved "https://registry.yarnpkg.com/immutable/-/immutable-3.8.1.tgz#200807f11ab0f72710ea485542de088075f68cd2"
 
-immutable@v4.0.0-rc.2:
-  version "4.0.0-rc.2"
-  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.0.0-rc.2.tgz#fdd0948aae728fda2306a02f72bb73e1773432d1"
+immutable@^3.8.2:
+  version "3.8.2"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-3.8.2.tgz#c2439951455bb39913daf281376f1530e104adf3"
 
 imurmurhash@^0.1.4:
   version "0.1.4"
@@ -3923,10 +3923,6 @@ mobx@^2.3.4:
   version "2.7.0"
   resolved "https://registry.yarnpkg.com/mobx/-/mobx-2.7.0.tgz#cf3d82d18c0ca7f458d8f2a240817b3dc7e54a01"
 
-moment@^2.18.1:
-  version "2.18.1"
-  resolved "https://registry.yarnpkg.com/moment/-/moment-2.18.1.tgz#c36193dd3ce1c2eed2adb7c802dbbc77a81b1c0f"
-
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"