diff --git a/package-lock.json b/package-lock.json
index 7bfb91f..1f8d141 100644
--- a/package-lock.json
+++ b/package-lock.json
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           "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8=",
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -9746,7 +9759,8 @@
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/upath/-/upath-1.1.2.tgz",
       "integrity": "sha512-kXpym8nmDmlCBr7nKdIx8P2jNBa+pBpIUFRnKJ4dr8htyYGJFokkr2ZvERRtUN+9SY+JqXouNgUPtv6JQva/2Q==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "uri-js": {
       "version": "4.2.2",
@@ -9769,7 +9783,8 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "url": {
       "version": "0.11.0",
@@ -9793,17 +9808,8 @@
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
-      "dev": true
-    },
-    "useragent": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.3.0.tgz",
-      "integrity": "sha512-4AoH4pxuSvHCjqLO04sU6U/uE65BYza8l/KKBS0b0hnUPWi+cQ2BpeTEwejCSx9SPV5/U03nniDTrWx5NrmKdw==",
       "dev": true,
-      "requires": {
-        "lru-cache": "4.1.x",
-        "tmp": "0.0.x"
-      }
+      "optional": true
     },
     "util": {
       "version": "0.10.3",
diff --git a/package.json b/package.json
index 339f11a..4367760 100644
--- a/package.json
+++ b/package.json
@@ -57,7 +57,7 @@
     "cross-env": "^5.0.5",
     "dedupe": "^3.0.1",
     "eslint": "^5.16.0",
-    "karma": "^4.1.0",
+    "karma": "^5.0.0",
     "karma-browserify": "^6.0.0",
     "karma-mocha": "^1.3.0",
     "karma-phantomjs-launcher": "^1.0.4",