diff --git a/package-lock.json b/package-lock.json
index 512886f..5cd3eae 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
         }
       }
     },
     "webpack-sources": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.1.0.tgz",
-      "integrity": "sha512-aqYp18kPphgoO5c/+NaUvEeACtZjMESmDChuD3NBciVpah3XpMEU9VAAtIaB1BsfJWWTSdv8Vv1m3T0aRk2dUw==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.3.0.tgz",
+      "integrity": "sha512-OiVgSrbGu7NEnEvQJJgdSFPl2qWKkWq5lHMhgiToIiN9w34EBnjYzSYs+VbL5KoYiLNtFFa7BZIKxRED3I32pA==",
       "dev": true,
       "requires": {
         "source-list-map": "^2.0.0",
@@ -6457,18 +7191,21 @@
       "resolved": "https://registry.npmjs.org/window-or-global/-/window-or-global-1.0.1.tgz",
       "integrity": "sha1-2+RboqKRqrxW1iz2bEW3+jIpRt4="
     },
-    "window-size": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
-      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
-      "dev": true
-    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
+    "worker-farm": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.7.0.tgz",
+      "integrity": "sha512-rvw3QTZc8lAxyVrqcSGVm5yP/IJ2UcB3U0graE3LCFoZ0Yn2x4EoVSqJKdB/T5M+FLcRPjz4TDacRf3OCfNUzw==",
+      "dev": true,
+      "requires": {
+        "errno": "~0.1.7"
+      }
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
@@ -6497,9 +7234,9 @@
       "dev": true
     },
     "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
diff --git a/package.json b/package.json
index 3972452..d2b05b8 100644
--- a/package.json
+++ b/package.json
@@ -13,26 +13,27 @@
     "babel-preset-env": "^1.7.0",
     "babel-preset-stage-3": "^6.24.1",
     "chakram": "^1.5.0",
-    "eslint": "^4.19.1",
-    "eslint-config-airbnb-base": "^12.1.0",
-    "eslint-plugin-import": "^2.11.0",
+    "eslint": "^5.16.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-plugin-import": "^2.17.2",
     "get-stdin": "^5.0.1",
     "mocha": "^4.1.0",
     "mocha-steps": "^1.1.0",
-    "serverless-webpack": "^3.1.1",
-    "webpack": "^3.12.0"
+    "serverless-webpack": "^5.3.0",
+    "webpack": "^4.31.0"
   },
   "author": "Vojtěch Vondra",
   "license": "MIT",
   "dependencies": {
+    "@hapi/hoek": "^6.2.1",
     "aws-sdk": "^2.238.1",
     "buffer-equal-constant-time": "^1.0.1",
+    "cryptiles": "^4.1.3",
     "dynogels": "^9.0.0",
     "dynogels-promisified": "^1.0.4",
-    "hoek": "^4.2.1",
     "joi": "^13.3.0",
     "jsonwebtoken": "^8.3.0",
-    "lodash": "^4.17.5",
+    "lodash": "^4.17.11",
     "object.entries": "^1.0.4",
     "qrcode": "^1.2.0",
     "speakeasy": "^2.0.0"
diff --git a/src/import.js b/src/import.js
index 982c091..7a4cce7 100644
--- a/src/import.js
+++ b/src/import.js
@@ -98,11 +98,11 @@ export const postHandler = async (event, context, callback) => {
   /**
    * Cipher creation
    */
-
   if (!Array.isArray(body.ciphers)) {
     callback(null, validationError('Ciphers is not an array'));
     return;
-  } else if (!Array.isArray(body.folderrelationships)) {
+  }
+  if (!Array.isArray(body.folderrelationships)) {
     callback(null, validationError('FolderRelationships is not an array'));
     return;
   }
diff --git a/src/lib/bitwarden.js b/src/lib/bitwarden.js
index c62bc7a..2d61750 100644
--- a/src/lib/bitwarden.js
+++ b/src/lib/bitwarden.js
@@ -3,7 +3,9 @@ import crypto from 'crypto';
 import bufferEq from 'buffer-equal-constant-time';
 import entries from 'object.entries';
 import mapKeys from 'lodash/mapKeys';
-import { User, Device, CIPHER_MODEL_VERSION, USER_MODEL_VERSION } from './models';
+import {
+  User, Device, CIPHER_MODEL_VERSION, USER_MODEL_VERSION,
+} from './models';
 import { KDF_PBKDF2_ITERATIONS_DEFAULT } from './crypto';
 
 const JWT_DEFAULT_ALGORITHM = 'HS256';
diff --git a/webpack.config.js b/webpack.config.js
index 2a2b6a4..a4c0d4f 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -5,10 +5,11 @@ const slsw = require('serverless-webpack');
 module.exports = {
   entry: slsw.lib.entries,
   target: 'node',
+  mode: 'production',
   module: {
-    loaders: [{
+    rules: [{
       test: /\.js$/,
-      loaders: ['babel-loader'],
+      use: 'babel-loader',
       include: __dirname,
       exclude: /node_modules/,
     }],