diff --git a/CHANGELOG.md b/CHANGELOG.md
index f87521a43e..457481ee4e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,23 @@
 # Unreleased
 
+New features:
+
+- [#557 Bump outdated dependencies](https://github.com/alphagov/govuk-prototype-kit/pull/557):
+  - Update standard from 10.0.2 to 11.0.1 and fix violations
+  - Update run-sequence from 1.2.2 to 2.2.1
+  - Update require-dir from 0.3.2 to 1.0.0
+  - Update notifications-node-client from 3.0.0 to 4.1.0
+  - Update marked from 0.3.6 to 0.4.0
+  - Update gulp-sass from 3.1.0 to 4.0.1
+  - Update gulp-mocha from v4.3.1 to v6.0.0
+  - Update gulp-clean from 0.3.2 to 0.4.0
+  - Update express from 4.15.2 to 4.16.3
+  - Update dotenv from 4.0.0 to 6.0.0
+  - Update cross-spawn from 5.0.0 to 6.0.5
+  - Update basic-auth from 1.0.3 to 2.0.0
+- [#557 Remove unused readdir dependency](https://github.com/alphagov/govuk-prototype-kit/pull/557)
+- [#557 Fix a broken link in an error message](https://github.com/alphagov/govuk-prototype-kit/pull/557)
+
 Bug fixes:
 - [#556 Update branching example](https://github.com/alphagov/govuk-prototype-kit/pull/556)
 - [#536 Import missing component macros](https://github.com/alphagov/govuk_prototype_kit/pull/536)
diff --git a/gulp/clean.js b/gulp/clean.js
index 7d5cf1d983..6587689497 100644
--- a/gulp/clean.js
+++ b/gulp/clean.js
@@ -13,5 +13,5 @@ const config = require('./config.json')
 gulp.task('clean', function () {
   return gulp.src([config.paths.public + '/*',
     '.port.tmp'], {read: false})
-  .pipe(clean())
+    .pipe(clean())
 })
diff --git a/gulp/copy-assets.js b/gulp/copy-assets.js
index c855ea1232..aae7f58f80 100644
--- a/gulp/copy-assets.js
+++ b/gulp/copy-assets.js
@@ -10,11 +10,11 @@ const config = require('./config.json')
 gulp.task('copy-assets', function () {
   return gulp.src(['!' + config.paths.assets + 'sass{,/**/*}',
     config.paths.assets + '/**'])
-  .pipe(gulp.dest(config.paths.public))
+    .pipe(gulp.dest(config.paths.public))
 })
 
 gulp.task('copy-documentation-assets', function () {
   return gulp.src(['!' + config.paths.docsAssets + 'sass{,/**/*}',
     config.paths.docsAssets + '/**'])
-  .pipe(gulp.dest(config.paths.public))
+    .pipe(gulp.dest(config.paths.public))
 })
diff --git a/gulp/sass.js b/gulp/sass.js
index 33c2972e7e..934d3be3a5 100644
--- a/gulp/sass.js
+++ b/gulp/sass.js
@@ -13,16 +13,16 @@ const config = require('./config.json')
 
 gulp.task('sass', function () {
   return gulp.src(config.paths.assets + '/sass/*.scss')
-  .pipe(sourcemaps.init())
-  .pipe(sass({outputStyle: 'expanded'}).on('error', sass.logError))
-  .pipe(sourcemaps.write())
-  .pipe(gulp.dest(config.paths.public + '/stylesheets/'))
+    .pipe(sourcemaps.init())
+    .pipe(sass({outputStyle: 'expanded'}).on('error', sass.logError))
+    .pipe(sourcemaps.write())
+    .pipe(gulp.dest(config.paths.public + '/stylesheets/'))
 })
 
 gulp.task('sass-documentation', function () {
   return gulp.src(config.paths.docsAssets + '/sass/*.scss')
-  .pipe(sourcemaps.init())
-  .pipe(sass({outputStyle: 'expanded'}).on('error', sass.logError))
-  .pipe(sourcemaps.write())
-  .pipe(gulp.dest(config.paths.public + '/stylesheets/'))
+    .pipe(sourcemaps.init())
+    .pipe(sass({outputStyle: 'expanded'}).on('error', sass.logError))
+    .pipe(sourcemaps.write())
+    .pipe(gulp.dest(config.paths.public + '/stylesheets/'))
 })
diff --git a/gulp/tasks.js b/gulp/tasks.js
index 49905cde6e..a912d99062 100644
--- a/gulp/tasks.js
+++ b/gulp/tasks.js
@@ -10,35 +10,30 @@ const runSequence = require('run-sequence')
 
 gulp.task('default', function (done) {
   runSequence('generate-assets',
-                'watch',
-                'server', done)
+    'watch',
+    'server', done)
 })
 
 gulp.task('generate-assets', function (done) {
   runSequence('clean',
-                'sass',
-                'sass-documentation',
-                'copy-assets',
-                'copy-documentation-assets', done)
+    'sass',
+    'sass-documentation',
+    'copy-assets',
+    'copy-documentation-assets', done)
 })
 
 gulp.task('watch', function (done) {
   runSequence('watch-sass',
-               'watch-assets', done)
+    'watch-assets', done)
 })
 
 gulp.task('test', function () {
   runSequence('generate-assets',
-              'mocha')
+    'mocha')
 })
 
 gulp.task('mocha', function () {
   return gulp.src(['test/**/*.js'], { read: false })
-        .pipe(mocha({ reporter: 'spec' }))
-        .once('error', () => {
-          process.exit(1)
-        })
-        .once('end', () => {
-          process.exit()
-        })
+    .pipe(mocha({ reporter: 'spec', exit: true }))
+    .on('error', console.error)
 })
diff --git a/lib/utils.js b/lib/utils.js
index 2f78e5f8ec..1eeaabb817 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -75,7 +75,7 @@ exports.basicAuth = function (username, password) {
   return function (req, res, next) {
     if (!username || !password) {
       console.log('Username or password is not set.')
-      return res.send('<h1>Error:</h1><p>Username or password not set. <a href="https://govuk-prototype-kit.herokuapp.com/docs/publishing-on-heroku#5-set-a-username-and-password">See guidance for setting these</a>.</p>')
+      return res.send('<h1>Error:</h1><p>Username or password not set. <a href="https://govuk-prototype-kit.herokuapp.com/docs/publishing-on-heroku#6-set-a-username-and-password">See guidance for setting these</a>.</p>')
     }
 
     var user = basicAuth(req)
diff --git a/package.json b/package.json
index 9bbd58a868..72f7a7d21f 100644
--- a/package.json
+++ b/package.json
@@ -12,36 +12,35 @@
     "test": "gulp test && npm run lint"
   },
   "dependencies": {
-    "basic-auth": "^1.0.3",
+    "basic-auth": "^2.0.0",
     "basic-auth-connect": "^1.0.0",
     "body-parser": "^1.14.1",
     "browser-sync": "^2.11.1",
     "cookie-parser": "^1.4.3",
-    "cross-spawn": "^5.0.0",
-    "dotenv": "^4.0.0",
-    "express": "4.15.2",
+    "cross-spawn": "^6.0.5",
+    "dotenv": "^6.0.0",
+    "express": "4.16.3",
     "express-session": "^1.13.0",
     "express-writer": "0.0.4",
     "govuk-frontend": "^1.0.0",
     "gulp": "^3.9.1",
-    "gulp-clean": "^0.3.2",
-    "gulp-mocha": "^4.3.1",
+    "gulp-clean": "^0.4.0",
+    "gulp-mocha": "^6.0.0",
     "gulp-nodemon": "^2.1.0",
-    "gulp-sass": "3.1.0",
+    "gulp-sass": "^4.0.1",
     "gulp-sourcemaps": "^2.6.0",
     "gulp-util": "^3.0.7",
-    "marked": "^0.3.6",
+    "marked": "^0.4.0",
     "minimist": "1.2.0",
-    "notifications-node-client": "^3.0.0",
+    "notifications-node-client": "^4.1.0",
     "nunjucks": "^3.1.3",
     "portscanner": "^2.1.1",
     "prompt": "^1.0.0",
-    "readdir": "0.0.13",
-    "require-dir": "^0.3.0",
-    "run-sequence": "^1.2.2",
-    "standard": "^10.0.2",
+    "require-dir": "^1.0.0",
+    "run-sequence": "^2.2.1",
+    "standard": "^11.0.1",
     "supertest": "^3.0.0",
-    "sync-request": "^4.0.3",
+    "sync-request": "^6.0.0",
     "universal-analytics": "^0.4.16",
     "uuid": "^3.2.1"
   },
diff --git a/start.js b/start.js
index cbe009c677..75093f2711 100644
--- a/start.js
+++ b/start.js
@@ -47,7 +47,7 @@ function checkFiles () {
   const envExists = fs.existsSync(path.join(__dirname, '/.env'))
   if (!envExists) {
     fs.createReadStream(path.join(__dirname, '/lib/template.env'))
-    .pipe(fs.createWriteStream(path.join(__dirname, '/.env')))
+      .pipe(fs.createWriteStream(path.join(__dirname, '/.env')))
   }
 }
 
@@ -63,7 +63,7 @@ if (!sessionDataDefaultsFileExists) {
   }
 
   fs.createReadStream(path.join(__dirname, '/lib/template.session-data-defaults.js'))
-  .pipe(fs.createWriteStream(sessionDataDefaultsFile))
+    .pipe(fs.createWriteStream(sessionDataDefaultsFile))
 }
 
 // Run gulp