diff --git a/package.json b/package.json
index 9ec50ff0..eb0a841d 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "webpack-merge": "^4.1.4"
   },
   "devDependencies": {
-    "webpack-dev-server": "3.4.1"
+    "webpack-dev-server": "3.9.0"
   },
   "scripts": {
     "webpack": "./bin/webpack",
diff --git a/yarn.lock b/yarn.lock
index d243fb32..1b891096 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1320,6 +1320,11 @@ async-foreach@^0.1.3:
   resolved "https://registry.yarnpkg.com/async-foreach/-/async-foreach-0.1.3.tgz#36121f845c0578172de419a97dbeb1d16ec34542"
   integrity sha1-NhIfhFwFeBct5Bmpfb6x0W7DRUI=
 
+async-limiter@~1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
+  integrity sha512-csOlWGAcRFJaI6m+F2WKdnMKr4HhdhFVBk0H/QbJFMCr+uO2kwohwXQPxw/9OCxp05r5ghVBFSyioixx3gfkNQ==
+
 async@^1.4.0:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
@@ -1815,7 +1820,7 @@ chardet@^0.7.0:
   resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.7.0.tgz#90094849f0937f2eedc2425d0d28a9e5f0cbad9e"
   integrity sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==
 
-chokidar@^2.0.2, chokidar@^2.1.6:
+chokidar@^2.0.2, chokidar@^2.1.8:
   version "2.1.8"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-2.1.8.tgz#804b3a7b6a99358c3c5c61e71d8728f041cff917"
   integrity sha512-ZmZUazfOzf0Nve7duiCKD23PFSCs4JPoYyccjUFF3aQkQadqBhfzhjkwBH2mNOG9cTBwhamM37EIsIkZw3nRgg==
@@ -3268,7 +3273,7 @@ expand-tilde@^2.0.0, expand-tilde@^2.0.2:
   dependencies:
     homedir-polyfill "^1.0.1"
 
-express@^4.17.0:
+express@^4.17.1:
   version "4.17.1"
   resolved "https://registry.yarnpkg.com/express/-/express-4.17.1.tgz#4491fc38605cf51f8629d39c2b5d026f98a4c134"
   integrity sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==
@@ -4026,7 +4031,7 @@ http-proxy-agent@^2.1.0:
     agent-base "4"
     debug "3.1.0"
 
-http-proxy-middleware@^0.19.1:
+http-proxy-middleware@0.19.1:
   version "0.19.1"
   resolved "https://registry.yarnpkg.com/http-proxy-middleware/-/http-proxy-middleware-0.19.1.tgz#183c7dc4aa1479150306498c210cdaf96080a43a"
   integrity sha512-yHYTgWMQO8VvwNS22eLLloAkvungsKdKTLO8AJlftYIKNfJr3GK3zK0ZCfzDDGUBttdGc8xFy1mCitvNKQtC3Q==
@@ -4280,6 +4285,11 @@ is-absolute-url@^2.0.0:
   resolved "https://registry.yarnpkg.com/is-absolute-url/-/is-absolute-url-2.1.0.tgz#50530dfb84fcc9aa7dbe7852e83a37b93b9f2aa6"
   integrity sha1-UFMN+4T8yap9vnhS6Do3uTufKqY=
 
+is-absolute-url@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/is-absolute-url/-/is-absolute-url-3.0.3.tgz#96c6a22b6a23929b11ea0afb1836c36ad4a5d698"
+  integrity sha512-opmNIX7uFnS96NtPmhWQgQx6/NYFgsUXYMllcfzwWKUMwfo8kku1TvE6hkNcH+Q1ts5cMVrsY7j0bxXQDciu9Q==
+
 is-accessor-descriptor@^0.1.6:
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz#a9e12cb3ae8d876727eeef3843f8a0897b5c98d6"
@@ -4922,7 +4932,7 @@ lodash@^4.0.0, lodash@^4.17.11, lodash@^4.17.12, lodash@^4.17.13, lodash@^4.17.1
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
 
-loglevel@^1.6.1:
+loglevel@^1.6.4:
   version "1.6.6"
   resolved "https://registry.yarnpkg.com/loglevel/-/loglevel-1.6.6.tgz#0ee6300cc058db6b3551fa1c4bf73b83bb771312"
   integrity sha512-Sgr5lbboAUBo3eXCSPL4/KoVz3ROKquOjcctxmHIt+vol2DrqTQe3SwkKKuYhEiWB5kYa13YyopJ69deJ1irzQ==
@@ -5776,6 +5786,13 @@ p-map@^2.0.0:
   resolved "https://registry.yarnpkg.com/p-map/-/p-map-2.1.0.tgz#310928feef9c9ecc65b68b17693018a665cea175"
   integrity sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==
 
+p-retry@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/p-retry/-/p-retry-3.0.1.tgz#316b4c8893e2c8dc1cfa891f406c4b422bebf328"
+  integrity sha512-XE6G4+YTTkT2a0UWb2kjZe8xNwf8bIbnqpc/IS/idOBVhyves0mK5OJgeocjx7q5pvX/6m23xuzVPYT1uGM73w==
+  dependencies:
+    retry "^0.12.0"
+
 p-try@^2.0.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.2.0.tgz#cb2868540e313d61de58fafbe35ce9004d5540e6"
@@ -6035,7 +6052,7 @@ popper.js@^1.15.0:
   resolved "https://registry.yarnpkg.com/popper.js/-/popper.js-1.16.0.tgz#2e1816bcbbaa518ea6c2e15a466f4cb9c6e2fbb3"
   integrity sha512-+G+EkOPoE5S/zChTpmBSSDYmhXJ5PsW8eMhH8cP/CQHMFPBG/kC9Y5IIw6qNYgdJ+/COf0ddY2li28iHaZRSjw==
 
-portfinder@^1.0.20:
+portfinder@^1.0.25:
   version "1.0.25"
   resolved "https://registry.yarnpkg.com/portfinder/-/portfinder-1.0.25.tgz#254fd337ffba869f4b9d37edc298059cb4d35eca"
   integrity sha512-6ElJnHBbxVA1XSLgBp7G1FiCkQdlqGzuF7DswL5tcea+E8UpuvPU7beVAjjRwCioTS9ZluNbu+ZyRvgTsmqEBg==
@@ -7193,6 +7210,11 @@ ret@~0.1.10:
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
   integrity sha512-TTlYpa+OL+vMMNG24xSlQGEJ3B/RzEfUlLct7b5G/ytav+wPrplCpVMFuwzXbkecJrb6IYo1iFb0S9v37754mg==
 
+retry@^0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/retry/-/retry-0.12.0.tgz#1b42a6266a21f07421d1b0b54b7dc167b01c013b"
+  integrity sha1-G0KmJmoh8HQh0bC1S33BZ7AcATs=
+
 rgb-regex@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/rgb-regex/-/rgb-regex-1.0.1.tgz#c0e0d6882df0e23be254a475e8edd41915feaeb1"
@@ -7319,7 +7341,7 @@ select-hose@^2.0.0:
   resolved "https://registry.yarnpkg.com/select-hose/-/select-hose-2.0.0.tgz#625d8658f865af43ec962bfc376a37359a4994ca"
   integrity sha1-Yl2GWPhlr0Psliv8N2o3NZpJlMo=
 
-selfsigned@^1.10.4:
+selfsigned@^1.10.7:
   version "1.10.7"
   resolved "https://registry.yarnpkg.com/selfsigned/-/selfsigned-1.10.7.tgz#da5819fd049d5574f28e88a9bcc6dbc6e6f3906b"
   integrity sha512-8M3wBCzeWIJnQfl43IKwOmC4H/RAp50S8DF60znzjW5GVqTcSe2vWclt7hmYVPkKPlHWOu5EaWOMZ2Y6W8ZXTA==
@@ -7760,10 +7782,10 @@ snyk@^1.256.0:
     uuid "^3.3.2"
     wrap-ansi "^5.1.0"
 
-sockjs-client@1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/sockjs-client/-/sockjs-client-1.3.0.tgz#12fc9d6cb663da5739d3dc5fb6e8687da95cb177"
-  integrity sha512-R9jxEzhnnrdxLCNln0xg5uGHqMnkhPSTzUZH2eXcR03S/On9Yvoq2wyUZILRUhZCNVu2PmwWVoyuiPz8th8zbg==
+sockjs-client@1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/sockjs-client/-/sockjs-client-1.4.0.tgz#c9f2568e19c8fd8173b4997ea3420e0bb306c7d5"
+  integrity sha512-5zaLyO8/nri5cua0VtOrFXBPK1jbL4+1cebT/mmKA1E1ZXOvJrII75bPu0l0k843G/+iAbhEqzyKr0w/eCCj7g==
   dependencies:
     debug "^3.2.5"
     eventsource "^1.0.7"
@@ -7887,7 +7909,7 @@ spdy-transport@^3.0.0:
     readable-stream "^3.0.6"
     wbuf "^1.7.3"
 
-spdy@^4.0.0:
+spdy@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/spdy/-/spdy-4.0.1.tgz#6f12ed1c5db7ea4f24ebb8b89ba58c87c08257f2"
   integrity sha512-HeZS3PBdMA+sZSu0qwpCxl3DeALD5ASx8pAX0jZdKXSpPWbQ6SYGnlg3BBmYLx5LtiZrmkAZfErCm2oECBcioA==
@@ -8709,7 +8731,7 @@ webpack-cli@^3.3.2:
     v8-compile-cache "2.0.3"
     yargs "13.2.4"
 
-webpack-dev-middleware@^3.7.0:
+webpack-dev-middleware@^3.7.2:
   version "3.7.2"
   resolved "https://registry.yarnpkg.com/webpack-dev-middleware/-/webpack-dev-middleware-3.7.2.tgz#0019c3db716e3fa5cecbf64f2ab88a74bab331f3"
   integrity sha512-1xC42LxbYoqLNAhV6YzTYacicgMZQTqRd27Sim9wn5hJrX3I5nxYy1SxSd4+gjUFsz1dQFj+yEe6zEVmSkeJjw==
@@ -8720,40 +8742,43 @@ webpack-dev-middleware@^3.7.0:
     range-parser "^1.2.1"
     webpack-log "^2.0.0"
 
-webpack-dev-server@3.4.1:
-  version "3.4.1"
-  resolved "https://registry.yarnpkg.com/webpack-dev-server/-/webpack-dev-server-3.4.1.tgz#a5fd8dec95dec410098e7d9a037ff9405395d51a"
-  integrity sha512-CRqZQX2ryMtrg0r3TXQPpNh76eM1HD3Wmu6zDBxIKi/d2y+4aa28Ia8weNT0bfgWpY6Vs3Oq/K8+DjfbR+tWYw==
+webpack-dev-server@3.9.0:
+  version "3.9.0"
+  resolved "https://registry.yarnpkg.com/webpack-dev-server/-/webpack-dev-server-3.9.0.tgz#27c3b5d0f6b6677c4304465ac817623c8b27b89c"
+  integrity sha512-E6uQ4kRrTX9URN9s/lIbqTAztwEPdvzVrcmHE8EQ9YnuT9J8Es5Wrd8n9BKg1a0oZ5EgEke/EQFgUsp18dSTBw==
   dependencies:
     ansi-html "0.0.7"
     bonjour "^3.5.0"
-    chokidar "^2.1.6"
+    chokidar "^2.1.8"
     compression "^1.7.4"
     connect-history-api-fallback "^1.6.0"
     debug "^4.1.1"
     del "^4.1.1"
-    express "^4.17.0"
+    express "^4.17.1"
     html-entities "^1.2.1"
-    http-proxy-middleware "^0.19.1"
+    http-proxy-middleware "0.19.1"
     import-local "^2.0.0"
     internal-ip "^4.3.0"
     ip "^1.1.5"
+    is-absolute-url "^3.0.3"
     killable "^1.0.1"
-    loglevel "^1.6.1"
+    loglevel "^1.6.4"
     opn "^5.5.0"
-    portfinder "^1.0.20"
+    p-retry "^3.0.1"
+    portfinder "^1.0.25"
     schema-utils "^1.0.0"
-    selfsigned "^1.10.4"
-    semver "^6.0.0"
+    selfsigned "^1.10.7"
+    semver "^6.3.0"
     serve-index "^1.9.1"
     sockjs "0.3.19"
-    sockjs-client "1.3.0"
-    spdy "^4.0.0"
+    sockjs-client "1.4.0"
+    spdy "^4.0.1"
     strip-ansi "^3.0.1"
     supports-color "^6.1.0"
     url "^0.11.0"
-    webpack-dev-middleware "^3.7.0"
+    webpack-dev-middleware "^3.7.2"
     webpack-log "^2.0.0"
+    ws "^6.2.1"
     yargs "12.0.5"
 
 webpack-log@^2.0.0:
@@ -8908,6 +8933,13 @@ write-file-atomic@^2.0.0:
     imurmurhash "^0.1.4"
     signal-exit "^3.0.2"
 
+ws@^6.2.1:
+  version "6.2.1"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.2.1.tgz#442fdf0a47ed64f59b6a5d8ff130f4748ed524fb"
+  integrity sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==
+  dependencies:
+    async-limiter "~1.0.0"
+
 xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"