diff --git a/package-lock.json b/package-lock.json
index 64fa807..0e63934 100644
--- a/package-lock.json
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+          "resolved": "https://registry.npmjs.org/sockjs-client/-/sockjs-client-1.4.0.tgz",
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-            "strip-ansi": "^4.0.0"
+            "debug": "^3.2.5",
+            "eventsource": "^1.0.7",
+            "faye-websocket": "~0.11.1",
+            "inherits": "^2.0.3",
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-              "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+            "debug": {
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               "requires": {
-                "ansi-regex": "^3.0.0"
+                "ms": "^2.1.1"
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+        "spdy": {
+          "version": "4.0.2",
+          "resolved": "https://registry.npmjs.org/spdy/-/spdy-4.0.2.tgz",
+          "integrity": "sha512-r46gZQZQV+Kl9oItvl1JZZqJKGr+oEkB08A6BzkiR7593/7IbtuncXHd2YoYeTsG4157ZssMu9KYvUHLcjcDoA==",
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+          "requires": {
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+            "handle-thing": "^2.0.0",
+            "http-deceiver": "^1.2.7",
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@@ -8525,62 +8488,41 @@
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-          "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+        "webpack-dev-middleware": {
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+          "resolved": "https://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-3.7.3.tgz",
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-                "is-fullwidth-code-point": "^1.0.0",
-                "strip-ansi": "^3.0.0"
-              }
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+            "memory-fs": "^0.4.1",
+            "mime": "^2.4.4",
+            "mkdirp": "^0.5.1",
+            "range-parser": "^1.2.1",
+            "webpack-log": "^2.0.0"
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         "yargs": {
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-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
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+          "version": "13.3.2",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
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           "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
+            "cliui": "^5.0.0",
             "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^3.0.0",
+            "get-caller-file": "^2.0.1",
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             "which-module": "^2.0.0",
-            "y18n": "^3.2.1 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
+            "y18n": "^4.0.0",
+            "yargs-parser": "^13.1.2"
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         "yargs-parser": {
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-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
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+          "version": "13.1.2",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
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diff --git a/package.json b/package.json
index 4df2c77..b25f22b 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "typescript": "3.5.3",
     "webpack": "4.39.2",
     "webpack-cli": "3.3.6",
-    "webpack-dev-server": "3.8.0"
+    "webpack-dev-server": "3.11.0"
   },
   "dependencies": {
     "@babel/preset-env-standalone": "^7.5.5",