diff --git a/yarn.lock b/yarn.lock
index 4d43cc8..6fef04e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -932,9 +932,9 @@
   integrity sha512-fxfMSBMX3tlIbKUdtGKxqB1fyrH6gVrX39Gsv3y8lRYKUqlgDt3UMqQyGnR1bQMa2B8aGnhLZokZgg8vT0Le+A==
 
 "@material-ui/core@~4":
-  version "4.9.3"
-  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.9.3.tgz#29ad51f4d36cbc3af7a9db27d92f93fa4fa42d50"
-  integrity sha512-EQrhN7XHdCfBCMiCTHmiHSn/H1tj2qCt5W/kSDhr1gaYAtBTTiQ29j2xR1NcHT1siVQqAtgIkPephqbTEgQLwA==
+  version "4.9.4"
+  resolved "https://registry.yarnpkg.com/@material-ui/core/-/core-4.9.4.tgz#796515b12845dc6ea7e21872888cfc4c0c1c1efe"
+  integrity sha512-1wqm3jBC8mGpVHu0wVOYBX7LUzkPsWxkkTtKSn0Hz66T6TDJkke72mkSIL7akNdjnxy+bRc2Vi6NiJ4YutkDcw==
   dependencies:
     "@babel/runtime" "^7.4.4"
     "@material-ui/styles" "^4.9.0"
@@ -943,7 +943,6 @@
     "@material-ui/utils" "^4.7.1"
     "@types/react-transition-group" "^4.2.0"
     clsx "^1.0.2"
-    convert-css-length "^2.0.1"
     hoist-non-react-statics "^3.3.2"
     popper.js "^1.14.1"
     prop-types "^15.7.2"
@@ -1073,9 +1072,9 @@
     "@types/react" "*"
 
 "@types/react@*":
-  version "16.9.19"
-  resolved "https://registry.yarnpkg.com/@types/react/-/react-16.9.19.tgz#c842aa83ea490007d29938146ff2e4d9e4360c40"
-  integrity sha512-LJV97//H+zqKWMms0kvxaKYJDG05U2TtQB3chRLF8MPNs+MQh/H1aGlyDUxjaHvu08EAGerdX2z4LTBc7ns77A==
+  version "16.9.22"
+  resolved "https://registry.yarnpkg.com/@types/react/-/react-16.9.22.tgz#f0288c92d94e93c4b43e3f5633edf788b2c040ae"
+  integrity sha512-7OSt4EGiLvy0h5R7X+r0c7S739TCU/LvWbkNOrm10lUwNHe7XPz5OLhLOSZeCkqO9JSCly1NkYJ7ODTUqVnHJQ==
   dependencies:
     "@types/prop-types" "*"
     csstype "^2.2.0"
@@ -2162,11 +2161,6 @@ content-type@1.0.4:
   resolved "https://registry.yarnpkg.com/content-type/-/content-type-1.0.4.tgz#e138cc75e040c727b1966fe5e5f8c9aee256fe3b"
   integrity sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA==
 
-convert-css-length@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/convert-css-length/-/convert-css-length-2.0.1.tgz#90a76bde5bfd24d72881a5b45d02249b2c1d257c"
-  integrity sha512-iGpbcvhLPRKUbBc0Quxx7w/bV14AC3ItuBEGMahA5WTYqB8lq9jH0kTXFheCBASsYnqeMFZhiTruNxr1N59Axg==
-
 convert-source-map@1.7.0, convert-source-map@^1.7.0:
   version "1.7.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-1.7.0.tgz#17a2cb882d7f77d3490585e2ce6c524424a3a442"