diff --git a/tutorials/jetsetter/yarn.lock b/tutorials/jetsetter/yarn.lock
index 7d3add8..04b1a90 100644
--- a/tutorials/jetsetter/yarn.lock
+++ b/tutorials/jetsetter/yarn.lock
@@ -2027,58 +2027,6 @@ currently-unhandled@^0.4.1:
   dependencies:
     array-find-index "^1.0.1"
 
-custom-react-scripts@0.2.1:
-  version "0.2.1"
-  resolved "https://registry.yarnpkg.com/custom-react-scripts/-/custom-react-scripts-0.2.1.tgz#4346a08ab01d2e7f54d1b92d5080b0ea4dd0ea95"
-  dependencies:
-    autoprefixer "7.1.2"
-    babel-core "6.25.0"
-    babel-eslint "7.2.3"
-    babel-jest "20.0.3"
-    babel-loader "7.1.1"
-    babel-plugin-transform-decorators-legacy "^1.3.4"
-    babel-preset-react-app "^3.0.2"
-    babel-preset-stage-0 "^6.24.1"
-    babel-runtime "6.23.0"
-    case-sensitive-paths-webpack-plugin "2.1.1"
-    chalk "1.1.3"
-    css-loader "0.28.4"
-    dotenv "4.0.0"
-    eslint "4.4.1"
-    eslint-config-react-app "^2.0.0"
-    eslint-loader "1.9.0"
-    eslint-plugin-flowtype "2.35.0"
-    eslint-plugin-import "2.7.0"
-    eslint-plugin-jsx-a11y "5.1.1"
-    eslint-plugin-react "7.1.0"
-    extract-text-webpack-plugin "3.0.0"
-    file-loader "0.11.2"
-    fs-extra "3.0.1"
-    html-webpack-plugin "2.29.0"
-    jest "20.0.4"
-    less "^2.7.2"
-    less-loader "^4.0.5"
-    node-sass "^4.5.3"
-    object-assign "4.1.1"
-    postcss-flexbugs-fixes "3.2.0"
-    postcss-loader "2.0.6"
-    promise "8.0.1"
-    react-dev-utils "^3.1.0"
-    react-error-overlay "^1.0.10"
-    sass-loader "^6.0.6"
-    style-loader "0.18.2"
-    stylus "^0.54.5"
-    stylus-loader "^3.0.1"
-    sw-precache-webpack-plugin "0.11.4"
-    url-loader "0.5.9"
-    webpack "3.5.1"
-    webpack-dashboard "^1.0.0-2"
-    webpack-dev-server "2.7.1"
-    webpack-manifest-plugin "1.2.1"
-    whatwg-fetch "2.0.3"
-  optionalDependencies:
-    fsevents "1.1.2"
-
 d@1:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/d/-/d-1.0.0.tgz#754bb5bfe55451da69a58b94d45f4c5b0462d58f"
@@ -3117,13 +3065,6 @@ fs.realpath@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
 
-fsevents@1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-1.1.2.tgz#3282b713fb3ad80ede0e9fcf4611b5aa6fc033f4"
-  dependencies:
-    nan "^2.3.0"
-    node-pre-gyp "^0.6.36"
-
 fsevents@^1.0.0:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-1.1.3.tgz#11f82318f5fe7bb2cd22965a108e9306208216d8"
@@ -4529,8 +4470,8 @@ locate-path@^2.0.0:
     path-exists "^3.0.0"
 
 lodash-es@^4.2.0, lodash-es@^4.2.1:
-  version "4.17.4"
-  resolved "https://registry.yarnpkg.com/lodash-es/-/lodash-es-4.17.4.tgz#dcc1d7552e150a0640073ba9cb31d70f032950e7"
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash-es/-/lodash-es-4.17.21.tgz#43e626c46e6591b7750beb2b50117390c609e3ee"
 
 lodash._reinterpolate@~3.0.0:
   version "3.0.0"
@@ -4943,7 +4884,7 @@ node-notifier@^5.0.2:
     shellwords "^0.1.0"
     which "^1.2.12"
 
-node-pre-gyp@^0.6.36, node-pre-gyp@^0.6.39:
+node-pre-gyp@^0.6.39:
   version "0.6.39"
   resolved "https://registry.yarnpkg.com/node-pre-gyp/-/node-pre-gyp-0.6.39.tgz#c00e96860b23c0e1420ac7befc5044e1d78d8649"
   dependencies: