diff --git a/client/karma.js b/client/karma.js
index 04715c059..71b2fa346 100644
--- a/client/karma.js
+++ b/client/karma.js
@@ -199,7 +199,7 @@ function Karma (socket, iframe, opener, navigator, location, document) {
 
     // Convert all array-like objects to real arrays.
     for (var propertyName in originalResult) {
-      if (originalResult.hasOwnProperty(propertyName)) {
+      if (Object.prototype.hasOwnProperty.call(originalResult, propertyName)) {
         var propertyValue = originalResult[propertyName]
 
         if (Object.prototype.toString.call(propertyValue) === '[object Array]') {
diff --git a/cucumber.js b/cucumber.js
index 90677cdef..8cf034dc9 100644
--- a/cucumber.js
+++ b/cucumber.js
@@ -9,5 +9,5 @@ const options = [
 ]
 
 module.exports = {
-  'default': options.join(' ')
+  default: options.join(' ')
 }
diff --git a/lib/browser.js b/lib/browser.js
index 0a0360f7a..c3ab8cc21 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -121,7 +121,7 @@ class Browser {
 
   reconnect (newSocket) {
     if (this.state === EXECUTING_DISCONNECTED) {
-      this.log.debug(`Lost socket connection, but browser continued to execute. Reconnected ` +
+      this.log.debug('Lost socket connection, but browser continued to execute. Reconnected ' +
         `on socket ${newSocket.id}.`)
       this.setState(EXECUTING)
     } else if ([CONNECTED, CONFIGURING, EXECUTING].includes(this.state)) {
diff --git a/lib/config.js b/lib/config.js
index 956577f65..1ea49b85c 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -162,7 +162,7 @@ function normalizeConfig (config, configFilePath) {
     config.protocol = 'http:'
   }
 
-  if (config.proxies && config.proxies.hasOwnProperty(config.urlRoot)) {
+  if (config.proxies && Object.prototype.hasOwnProperty.call(config.proxies, config.urlRoot)) {
     log.warn(`"${config.urlRoot}" is proxied, you should probably change urlRoot to avoid conflicts`)
   }
 
diff --git a/lib/helper.js b/lib/helper.js
index 34b349efd..e77418039 100644
--- a/lib/helper.js
+++ b/lib/helper.js
@@ -72,10 +72,9 @@ exports.mmPatternWeight = (pattern) => {
 }
 
 exports.mmComparePatternWeights = (weight1, weight2) => {
-  let n1, n2, diff
-  n1 = weight1[0]
-  n2 = weight2[0]
-  diff = n1 - n2
+  const n1 = weight1[0]
+  const n2 = weight2[0]
+  const diff = n1 - n2
   if (diff !== 0) return diff / Math.abs(diff)
   return weight1.length > 1 ? exports.mmComparePatternWeights(weight1.slice(1), weight2.slice(1)) : 0
 }
diff --git a/lib/init.js b/lib/init.js
index eb9b03555..8aab1eadd 100755
--- a/lib/init.js
+++ b/lib/init.js
@@ -121,7 +121,7 @@ var questions = [{
   condition: (answers) => answers.requirejs
 }, {
   id: 'includedFiles',
-  question: `Which files do you want to include with <script> tag ?`,
+  question: 'Which files do you want to include with <script> tag ?',
   hint: 'This should be a script that bootstraps your test by configuring Require.js and ' +
     'kicking __karma__.start(), probably your test-main.js file.\n' +
     'Enter empty string to move to the next question.',
diff --git a/lib/logger.js b/lib/logger.js
index e65c9baf2..da06d0eea 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -26,7 +26,7 @@ function setup (level, colors, appenders) {
   const pattern = colors ? constant.COLOR_PATTERN : constant.NO_COLOR_PATTERN
   if (appenders) {
     // Convert Array to Object for backwards compatibility.
-    if (appenders['map']) {
+    if (appenders.map) {
       if (appenders.length === 0) {
         appenders = [constant.CONSOLE_APPENDER]
       }
@@ -34,7 +34,7 @@ function setup (level, colors, appenders) {
       appenders = {}
       v1Appenders.forEach(function (appender, index) {
         if (appender.type === 'console') {
-          appenders['console'] = appender
+          appenders.console = appender
           if (helper.isDefined(appender.layout) && appender.layout.type === 'pattern') {
             appender.layout.pattern = pattern
           }
@@ -45,15 +45,15 @@ function setup (level, colors, appenders) {
       })
     }
   } else {
-    appenders = { 'console': constant.CONSOLE_APPENDER }
+    appenders = { console: constant.CONSOLE_APPENDER }
   }
 
   log4js.configure({
     appenders: appenders,
     categories: {
-      'default': {
-        'appenders': Object.keys(appenders),
-        'level': level
+      default: {
+        appenders: Object.keys(appenders),
+        level: level
       }
     }
   })
@@ -93,7 +93,7 @@ const loggerCache = {}
 function create (name, level) {
   name = name || 'karma'
   let logger
-  if (loggerCache.hasOwnProperty(name)) {
+  if (Object.prototype.hasOwnProperty.call(loggerCache, name)) {
     logger = loggerCache[name]
   } else {
     logger = log4js.getLogger(name)
diff --git a/lib/middleware/karma.js b/lib/middleware/karma.js
index 9cfd95ae9..c48332d12 100644
--- a/lib/middleware/karma.js
+++ b/lib/middleware/karma.js
@@ -19,9 +19,9 @@ const common = require('./common')
 
 const VERSION = require('../constants').VERSION
 const SCRIPT_TYPE = {
-  'js': 'text/javascript',
-  'dart': 'application/dart',
-  'module': 'module'
+  js: 'text/javascript',
+  dart: 'application/dart',
+  module: 'module'
 }
 const FILE_TYPES = [
   'css',
@@ -84,7 +84,7 @@ function createKarmaMiddleware (
     request.normalizedUrl = normalizedUrl
 
     let requestUrl = normalizedUrl.replace(/\?.*/, '')
-    const requestedRangeHeader = request.headers['range']
+    const requestedRangeHeader = request.headers.range
 
     // redirect /__karma__ to /__karma__ (trailing slash)
     if (requestUrl === urlRoot.substr(0, urlRoot.length - 1)) {
@@ -167,9 +167,9 @@ function createKarmaMiddleware (
             if (!FILE_TYPES.includes(fileType)) {
               if (file.type == null) {
                 log.warn(
-                  `Unable to determine file type from the file extension, defaulting to js.\n` +
+                  'Unable to determine file type from the file extension, defaulting to js.\n' +
                   `  To silence the warning specify a valid type for ${file.originalPath} in the configuration file.\n` +
-                  `  See http://karma-runner.github.io/latest/config/files.html`
+                  '  See http://karma-runner.github.io/latest/config/files.html'
                 )
               } else {
                 log.warn(`Invalid file type (${file.type || 'empty string'}), defaulting to js.`)
diff --git a/lib/middleware/source_files.js b/lib/middleware/source_files.js
index 9d59fb05e..e44ae021d 100644
--- a/lib/middleware/source_files.js
+++ b/lib/middleware/source_files.js
@@ -32,7 +32,7 @@ function createSourceFilesMiddleware (filesPromise, serveFile, basePath, urlRoot
     return filesPromise.then(function (files) {
       // TODO(vojta): change served to be a map rather then an array
       const file = findByPath(files.served, requestedFilePath) || findByPath(files.served, requestedFilePathUnescaped)
-      const rangeHeader = request.headers['range']
+      const rangeHeader = request.headers.range
 
       if (file) {
         const acceptEncodingHeader = request.headers['accept-encoding']
diff --git a/lib/preprocessor.js b/lib/preprocessor.js
index b69ec36da..4b56a3633 100644
--- a/lib/preprocessor.js
+++ b/lib/preprocessor.js
@@ -56,7 +56,7 @@ function executeProcessor (process, file, content) {
 
 async function runProcessors (preprocessors, file, content) {
   try {
-    for (let process of preprocessors) {
+    for (const process of preprocessors) {
       content = await executeProcessor(process, file, content)
     }
   } catch (error) {
diff --git a/lib/runner.js b/lib/runner.js
index f1d7324d2..e98a39da1 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -41,7 +41,7 @@ function run (config, done) {
   config = cfg.parseConfig(config.configFile, config)
 
   let exitCode = 1
-  let emitter = new EventEmitter()
+  const emitter = new EventEmitter()
   const options = {
     hostname: config.hostname,
     path: config.urlRoot + 'run',
diff --git a/package-lock.json b/package-lock.json
index bc3e31288..a33b467cc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1831,9 +1831,9 @@
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
-      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.2.0.tgz",
+      "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
       "dev": true
     },
     "acorn-node": {
@@ -1887,12 +1887,12 @@
       }
     },
     "ajv": {
-      "version": "6.10.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
-      "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+      "version": "6.12.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.2.tgz",
+      "integrity": "sha512-k+V+hzjm5q/Mr8ef/1Y9goCmlsK4I6Sm74teeyGvFk1XrOsbsKLjEdrvny42CZ+a8sXbk8KWpY/bDwS+FLL2UQ==",
       "dev": true,
       "requires": {
-        "fast-deep-equal": "^2.0.1",
+        "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",
         "json-schema-traverse": "^0.4.1",
         "uri-js": "^4.2.2"
@@ -2040,13 +2040,14 @@
       "dev": true
     },
     "array-includes": {
-      "version": "3.0.3",
-      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
-      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.1.1.tgz",
+      "integrity": "sha512-c2VXaCHl7zPsvpkFsw4nxvFie4fh1ur9bpcgsVkIjqn0H/Xwdg+7fv3n2r/isyS8EBj5b06M9kHyZuIr4El6WQ==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.7.0"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0",
+        "is-string": "^1.0.5"
       }
     },
     "array-map": {
@@ -2088,6 +2089,16 @@
       "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
       "dev": true
     },
+    "array.prototype.flat": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/array.prototype.flat/-/array.prototype.flat-1.2.3.tgz",
+      "integrity": "sha512-gBlRZV0VSmfPIeWfuuy56XZMvbVfbEUnOXUvt3F/eUUUSyzlgLxhEX4YAEpxNAogRGehPSnfXyPtYyKAhkzQhQ==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0-next.1"
+      }
+    },
     "arraybuffer.slice": {
       "version": "0.0.7",
       "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
@@ -2950,12 +2961,12 @@
       "dev": true
     },
     "cli-cursor": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-2.1.0.tgz",
-      "integrity": "sha1-s12sN2R5+sw+lHR9QdDQ9SOP/LU=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
       "dev": true,
       "requires": {
-        "restore-cursor": "^2.0.0"
+        "restore-cursor": "^3.1.0"
       }
     },
     "cli-table": {
@@ -2987,9 +2998,9 @@
       }
     },
     "cli-width": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.0.tgz",
-      "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-2.2.1.tgz",
+      "integrity": "sha512-GRMWDxpOB6Dgk2E5Uo+3eEBvtOOlimMmpbFiKuLFnQzYDavtLFY3K5ona41jgN/WdRZtG7utuVSVTL4HbZHGkw==",
       "dev": true
     },
     "cliui": {
@@ -4367,9 +4378,9 @@
       }
     },
     "emoji-regex": {
-      "version": "7.0.3",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-      "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
       "dev": true
     },
     "encodeurl": {
@@ -4516,23 +4527,28 @@
       }
     },
     "es-abstract": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
-      "integrity": "sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==",
+      "version": "1.17.5",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
+      "integrity": "sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==",
       "dev": true,
       "requires": {
-        "es-to-primitive": "^1.2.0",
+        "es-to-primitive": "^1.2.1",
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
-        "is-callable": "^1.1.4",
-        "is-regex": "^1.0.4",
-        "object-keys": "^1.0.12"
+        "has-symbols": "^1.0.1",
+        "is-callable": "^1.1.5",
+        "is-regex": "^1.0.5",
+        "object-inspect": "^1.7.0",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.0",
+        "string.prototype.trimleft": "^2.1.1",
+        "string.prototype.trimright": "^2.1.1"
       }
     },
     "es-to-primitive": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
-      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
       "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
@@ -4599,49 +4615,101 @@
       "dev": true
     },
     "eslint": {
-      "version": "5.16.0",
-      "resolved": "https://registry.npmjs.org/eslint/-/eslint-5.16.0.tgz",
-      "integrity": "sha512-S3Rz11i7c8AA5JPv7xAH+dOyq/Cu/VXHiHXBPOU1k/JAM5dXqQPt3qcrhpHSorXmrpu2g0gkIBVXAqCpzfoZIg==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/eslint/-/eslint-7.0.0.tgz",
+      "integrity": "sha512-qY1cwdOxMONHJfGqw52UOpZDeqXy8xmD0u8CT6jIstil72jkhURC704W8CFyTPDPllz4z4lu0Ql1+07PG/XdIg==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "ajv": "^6.9.1",
-        "chalk": "^2.1.0",
-        "cross-spawn": "^6.0.5",
+        "ajv": "^6.10.0",
+        "chalk": "^4.0.0",
+        "cross-spawn": "^7.0.2",
         "debug": "^4.0.1",
         "doctrine": "^3.0.0",
-        "eslint-scope": "^4.0.3",
-        "eslint-utils": "^1.3.1",
-        "eslint-visitor-keys": "^1.0.0",
-        "espree": "^5.0.1",
-        "esquery": "^1.0.1",
+        "eslint-scope": "^5.0.0",
+        "eslint-utils": "^2.0.0",
+        "eslint-visitor-keys": "^1.1.0",
+        "espree": "^7.0.0",
+        "esquery": "^1.2.0",
         "esutils": "^2.0.2",
         "file-entry-cache": "^5.0.1",
         "functional-red-black-tree": "^1.0.1",
-        "glob": "^7.1.2",
-        "globals": "^11.7.0",
+        "glob-parent": "^5.0.0",
+        "globals": "^12.1.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.0.0",
         "imurmurhash": "^0.1.4",
-        "inquirer": "^6.2.2",
-        "js-yaml": "^3.13.0",
+        "inquirer": "^7.0.0",
+        "is-glob": "^4.0.0",
+        "js-yaml": "^3.13.1",
         "json-stable-stringify-without-jsonify": "^1.0.1",
-        "levn": "^0.3.0",
-        "lodash": "^4.17.11",
+        "levn": "^0.4.1",
+        "lodash": "^4.17.14",
         "minimatch": "^3.0.4",
-        "mkdirp": "^0.5.1",
         "natural-compare": "^1.4.0",
-        "optionator": "^0.8.2",
-        "path-is-inside": "^1.0.2",
+        "optionator": "^0.9.1",
         "progress": "^2.0.0",
-        "regexpp": "^2.0.1",
-        "semver": "^5.5.1",
-        "strip-ansi": "^4.0.0",
-        "strip-json-comments": "^2.0.1",
+        "regexpp": "^3.1.0",
+        "semver": "^7.2.1",
+        "strip-ansi": "^6.0.0",
+        "strip-json-comments": "^3.1.0",
         "table": "^5.2.3",
-        "text-table": "^0.2.0"
+        "text-table": "^0.2.0",
+        "v8-compile-cache": "^2.0.3"
       },
       "dependencies": {
+        "ansi-regex": {
+          "version": "5.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
+          "integrity": "sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "4.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.2.1.tgz",
+          "integrity": "sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==",
+          "dev": true,
+          "requires": {
+            "@types/color-name": "^1.1.1",
+            "color-convert": "^2.0.1"
+          }
+        },
+        "chalk": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.0.0.tgz",
+          "integrity": "sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
+        },
+        "cross-spawn": {
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+          "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.2.tgz",
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+        "prelude-ls": "^1.2.1",
+        "type-check": "^0.4.0",
+        "word-wrap": "^1.2.3"
       }
     },
     "os-browserify": {
@@ -12718,12 +12993,6 @@
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
-    "path-is-inside": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/path-is-inside/-/path-is-inside-1.0.2.tgz",
-      "integrity": "sha1-NlQX3t5EQw0cEa9hAn+s8HS9/FM=",
-      "dev": true
-    },
     "path-key": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
@@ -12926,9 +13195,9 @@
       "dev": true
     },
     "prelude-ls": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
-      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
       "dev": true
     },
     "process": {
@@ -13263,9 +13532,9 @@
       }
     },
     "regexpp": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-2.0.1.tgz",
-      "integrity": "sha512-lv0M6+TkDVniA3aD1Eg0DVpfU/booSu7Eev3TDO/mZKHBfVjgCGTV4t4buppESEYDtkArYFOxTJWv6S5C+iaNw==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-3.1.0.tgz",
+      "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
       "dev": true
     },
     "registry-auth-token": {
@@ -13377,12 +13646,12 @@
       "dev": true
     },
     "restore-cursor": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-2.0.0.tgz",
-      "integrity": "sha1-n37ih/gv0ybU/RYpI9YhKe7g368=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-3.1.0.tgz",
+      "integrity": "sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==",
       "dev": true,
       "requires": {
-        "onetime": "^2.0.0",
+        "onetime": "^5.1.0",
         "signal-exit": "^3.0.2"
       }
     },
@@ -13428,13 +13697,10 @@
       }
     },
     "run-async": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.3.0.tgz",
-      "integrity": "sha1-A3GrSuC91yDUFm19/aZP96RFpsA=",
-      "dev": true,
-      "requires": {
-        "is-promise": "^2.1.0"
-      }
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true
     },
     "run-parallel": {
       "version": "1.1.9",
@@ -13443,9 +13709,9 @@
       "dev": true
     },
     "rxjs": {
-      "version": "6.5.2",
-      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.2.tgz",
-      "integrity": "sha512-HUb7j3kvb7p7eCUHE3FqjoDsC1xfZQ4AHFWfTKSpZ+sAhhz5X1WX0ZuUqWbzB2QhSLp3DoLUG+hMdEDKqWo2Zg==",
+      "version": "6.5.5",
+      "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-6.5.5.tgz",
+      "integrity": "sha512-WfQI+1gohdf0Dai/Bbmk5L5ItH5tYqm3ki2c5GdWhKjalzjg93N3avFjVStyZZz+A2Em+ZxKH5bNghw9UeylGQ==",
       "dev": true,
       "requires": {
         "tslib": "^1.9.0"
@@ -14381,6 +14647,48 @@
         "strip-ansi": "^4.0.0"
       }
     },
+    "string.prototype.trimend": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.1.tgz",
+      "integrity": "sha512-LRPxFUaTtpqYsTeNKaFOw3R4bxIzWOnbQ837QfBylo8jIxtcbK/A/sMV7Q+OAV/vWo+7s25pOE10KYSjaSO06g==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5"
+      }
+    },
+    "string.prototype.trimleft": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.2.tgz",
+      "integrity": "sha512-gCA0tza1JBvqr3bfAIFJGqfdRTyPae82+KTnm3coDXkZN9wnuW3HjGgN386D7hfv5CHQYCI022/rJPVlqXyHSw==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5",
+        "string.prototype.trimstart": "^1.0.0"
+      }
+    },
+    "string.prototype.trimright": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.2.tgz",
+      "integrity": "sha512-ZNRQ7sY3KroTaYjRS6EbNiiHrOkjihL9aQE/8gfQ4DtAC/aEBRHFJa44OmoWxGGqXuJlfKkZW4WcXErGr+9ZFg==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5",
+        "string.prototype.trimend": "^1.0.0"
+      }
+    },
+    "string.prototype.trimstart": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.1.tgz",
+      "integrity": "sha512-XxZn+QpvrBI1FOcg6dIpxUPgWCPuNXvMD72aaRaUQv1eD4e/Qy8i/hFTe0BUmD60p/QA6bh1avmuPTfNjqVWRw==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5"
+      }
+    },
     "string_decoder": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
@@ -14537,9 +14845,9 @@
       }
     },
     "table": {
-      "version": "5.4.4",
-      "resolved": "https://registry.npmjs.org/table/-/table-5.4.4.tgz",
-      "integrity": "sha512-IIfEAUx5QlODLblLrGTTLJA7Tk0iLSGBvgY8essPRVNGHAzThujww1YqHLs6h3HfTg55h++RzLHH5Xw/rfv+mg==",
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
       "dev": true,
       "requires": {
         "ajv": "^6.10.2",
@@ -14554,6 +14862,12 @@
           "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
           "dev": true
         },
+        "emoji-regex": {
+          "version": "7.0.3",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
+        },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
@@ -14842,9 +15156,9 @@
       "dev": true
     },
     "tslib": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
-      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+      "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
       "dev": true
     },
     "tty-browserify": {
@@ -14860,12 +15174,12 @@
       "dev": true
     },
     "type-check": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
-      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
       "dev": true,
       "requires": {
-        "prelude-ls": "~1.1.2"
+        "prelude-ls": "^1.2.1"
       }
     },
     "type-detect": {
@@ -15125,6 +15439,12 @@
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "v8flags": {
       "version": "3.1.3",
       "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
@@ -15419,6 +15739,12 @@
         }
       }
     },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true
+    },
     "wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
diff --git a/package.json b/package.json
index 15682cd1e..a0b166a36 100644
--- a/package.json
+++ b/package.json
@@ -425,12 +425,12 @@
     "chai-as-promised": "^7.1.1",
     "chai-subset": "^1.2.2",
     "cucumber": "^6.0.5",
-    "eslint": "^5.16.0",
-    "eslint-config-standard": "^12.0.0",
-    "eslint-plugin-import": "^2.17.2",
-    "eslint-plugin-node": "^9.0.1",
-    "eslint-plugin-promise": "^4.1.1",
-    "eslint-plugin-standard": "^4.0.0",
+    "eslint": "^7.0.0",
+    "eslint-config-standard": "^14.1.1",
+    "eslint-plugin-import": "^2.20.2",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
     "grunt": "^1.1.0",
     "grunt-auto-release": "^0.0.7",
     "grunt-browserify": "^5.0.0",
diff --git a/test/e2e/step_definitions/core_steps.js b/test/e2e/step_definitions/core_steps.js
index d2f69b476..014a32367 100644
--- a/test/e2e/step_definitions/core_steps.js
+++ b/test/e2e/step_definitions/core_steps.js
@@ -54,7 +54,7 @@ When('I execute Karma with arguments: {string}', async function (args) {
 Then(/^it passes with(:? (like|regexp))?:$/, { timeout: 10 * 1000 }, function (mode, expectedOutput, callback) {
   const like = mode === 'like'
   const regexp = mode === 'regexp'
-  let actualOutput = this.lastRun.stdout
+  const actualOutput = this.lastRun.stdout
 
   if (like && actualOutput.indexOf(expectedOutput) >= 0) {
     return callback()
diff --git a/test/unit/config.spec.js b/test/unit/config.spec.js
index 5f336aa16..169c418af 100644
--- a/test/unit/config.spec.js
+++ b/test/unit/config.spec.js
@@ -119,7 +119,7 @@ describe('config', () => {
       expect(logSpy).to.have.been.called
       const event = logSpy.lastCall.args
       expect(event.toString().split('\n').slice(0, 2)).to.be.deep.equal(
-        [`Error in config file!`, `  Error: Cannot find module '/conf/not-exist.js'`])
+        ['Error in config file!', '  Error: Cannot find module \'/conf/not-exist.js\''])
       expect(mocks.process.exit).to.have.been.calledWith(1)
     })
 
diff --git a/test/unit/launcher.spec.js b/test/unit/launcher.spec.js
index 827097406..52715f18b 100644
--- a/test/unit/launcher.spec.js
+++ b/test/unit/launcher.spec.js
@@ -78,7 +78,7 @@ describe('launcher', () => {
 
     beforeEach(() => {
       emitter = new events.EventEmitter()
-      server = { 'loadErrors': [] }
+      server = { loadErrors: [] }
       config = {
         captureTimeout: 0,
         protocol: 'http:',
@@ -90,10 +90,10 @@ describe('launcher', () => {
       const injector = new di.Injector([{
         'launcher:Fake': ['type', FakeBrowser],
         'launcher:Script': ['type', ScriptBrowser],
-        'server': ['value', server],
-        'emitter': ['value', emitter],
-        'config': ['value', config],
-        'timer': ['factory', createMockTimer]
+        server: ['value', server],
+        emitter: ['value', emitter],
+        config: ['value', config],
+        timer: ['factory', createMockTimer]
       }])
       l = new launcher.Launcher(server, emitter, injector)
     })
@@ -114,7 +114,7 @@ describe('launcher', () => {
       describe('with upstream proxy settings', () => {
         beforeEach(() => {
           emitter = new events.EventEmitter()
-          server = { 'loadErrors': [] }
+          server = { loadErrors: [] }
           config = {
             captureTimeout: 0,
             protocol: 'http:',
@@ -132,10 +132,10 @@ describe('launcher', () => {
           const injector = new di.Injector([{
             'launcher:Fake': ['type', FakeBrowser],
             'launcher:Script': ['type', ScriptBrowser],
-            'server': ['value', server],
-            'emitter': ['value', emitter],
-            'config': ['value', config],
-            'timer': ['factory', createMockTimer]
+            server: ['value', server],
+            emitter: ['value', emitter],
+            config: ['value', config],
+            timer: ['factory', createMockTimer]
           }])
           l = new launcher.Launcher(server, emitter, injector)
         })
diff --git a/test/unit/logger.spec.js b/test/unit/logger.spec.js
index b9ceb40ac..9e5adf8c2 100644
--- a/test/unit/logger.spec.js
+++ b/test/unit/logger.spec.js
@@ -11,7 +11,7 @@ describe('logger', () => {
         configuration = config
       }
     }
-    m = loadFile(path.join(__dirname, '/../../lib/logger.js'), { 'log4js': mockLog4Js })
+    m = loadFile(path.join(__dirname, '/../../lib/logger.js'), { log4js: mockLog4Js })
   })
 
   describe('setup', () => {
@@ -29,14 +29,14 @@ describe('logger', () => {
     })
     it('should allow setup() using log4js v2 object', () => {
       m.setup('WARN', true, {
-        'fileAppender': {
+        fileAppender: {
           type: 'file',
           filename: 'test/unit/test.log'
         }
       })
       expect(configuration).to.have.keys(['appenders', 'categories'])
       expect(configuration.appenders).to.have.keys(['fileAppender'])
-      expect(configuration.appenders['fileAppender'].type).to.equal('file')
+      expect(configuration.appenders.fileAppender.type).to.equal('file')
       expect(configuration.categories).to.have.keys(['default'])
       expect(configuration.categories.default.appenders[0]).to.equal('fileAppender')
       expect(configuration.categories.default.level).to.equal('WARN')
diff --git a/test/unit/middleware/karma.spec.js b/test/unit/middleware/karma.spec.js
index c7c474eaf..16242d09d 100644
--- a/test/unit/middleware/karma.spec.js
+++ b/test/unit/middleware/karma.spec.js
@@ -95,7 +95,7 @@ describe('middleware.karma', () => {
     response.once('end', () => {
       expect(nextSpy).not.to.have.been.called
       expect(response).to.beServedAs(301, 'MOVED PERMANENTLY')
-      expect(response._headers['Location']).to.equal('/__proxy__/__karma__/')
+      expect(response._headers.Location).to.equal('/__proxy__/__karma__/')
       done()
     })
 
@@ -349,8 +349,8 @@ describe('middleware.karma', () => {
       expect(nextSpy).not.to.have.been.called
       expect(response._headers['Cache-Control']).to.equal('no-cache')
       // idiotic IE8 needs more
-      expect(response._headers['Pragma']).to.equal('no-cache')
-      expect(response._headers['Expires']).to.equal(ZERO_DATE)
+      expect(response._headers.Pragma).to.equal('no-cache')
+      expect(response._headers.Expires).to.equal(ZERO_DATE)
       done()
     })
 
diff --git a/test/unit/middleware/proxy.spec.js b/test/unit/middleware/proxy.spec.js
index 30b3beb98..5e97e2290 100644
--- a/test/unit/middleware/proxy.spec.js
+++ b/test/unit/middleware/proxy.spec.js
@@ -7,7 +7,7 @@ describe('middleware.proxy', () => {
   let response
   let nextSpy
   let type
-  let m = loadFile(path.join(__dirname, '/../../../lib/middleware/proxy.js'))
+  const m = loadFile(path.join(__dirname, '/../../../lib/middleware/proxy.js'))
 
   const mockProxies = [{
     path: '/proxy',
diff --git a/test/unit/middleware/source_files.spec.js b/test/unit/middleware/source_files.spec.js
index 1729db3d2..8da227eed 100644
--- a/test/unit/middleware/source_files.spec.js
+++ b/test/unit/middleware/source_files.spec.js
@@ -23,7 +23,7 @@ describe('middleware.source_files', function () {
     src: {
       'some.js': mocks.fs.file(0, 'js-source')
     },
-    'utf8ášč': {
+    utf8ášč: {
       'some.js': mocks.fs.file(0, 'utf8-file')
     },
     'jenkins%2Fbranch': {
diff --git a/test/unit/preprocessor.spec.js b/test/unit/preprocessor.spec.js
index f001c4ec1..1f59eb87f 100644
--- a/test/unit/preprocessor.spec.js
+++ b/test/unit/preprocessor.spec.js
@@ -32,7 +32,7 @@ describe('preprocessor', () => {
       'graceful-fs': mockFs,
       minimatch: require('minimatch')
     }
-    emitterSetting = { 'emitter': ['value', new events.EventEmitter()] }
+    emitterSetting = { emitter: ['value', new events.EventEmitter()] }
     m = mocks.loadFile(path.join(__dirname, '/../../lib/preprocessor.js'), mocks_)
   })
 
@@ -469,7 +469,7 @@ describe('preprocessor', () => {
       'preprocessor:fakeD': ['factory', function () { return fakePreprocessorD }]
     }, emitterSetting])
 
-    const priority = { 'fakeA': -1, 'fakeB': 1, 'fakeD': 100 }
+    const priority = { fakeA: -1, fakeB: 1, fakeD: 100 }
 
     const pp = m.createPriorityPreprocessor({
       '/*/a.js': ['fakeA', 'fakeB'],
diff --git a/test/unit/server.spec.js b/test/unit/server.spec.js
index 39941acb8..a7761bdd8 100644
--- a/test/unit/server.spec.js
+++ b/test/unit/server.spec.js
@@ -19,7 +19,7 @@ describe('server', () => {
   let server = mockConfig = browserCollection = webServerOnError = null
   let fileListOnResolve = fileListOnReject = mockLauncher = null
   let mockFileList = mockWebServer = mockSocketServer = mockExecutor = doneSpy = null
-  let mockSocketEventListeners = new Map()
+  const mockSocketEventListeners = new Map()
 
   // Use regular function not arrow so 'this' is mocha 'this'.
   beforeEach(function () {