diff --git a/gatsby-config.js b/gatsby-config.js
index 9e679a4..c7aea29 100644
--- a/gatsby-config.js
+++ b/gatsby-config.js
@@ -9,6 +9,7 @@ module.exports = {
     'gatsby-plugin-react-helmet',
     'gatsby-transformer-json',
     'gatsby-plugin-sitemap',
+    'gatsby-plugin-offline',
     {
       resolve: 'gatsby-source-filesystem',
       options: {
diff --git a/package.json b/package.json
index 0b438ff..7e6a1cd 100644
--- a/package.json
+++ b/package.json
@@ -5,9 +5,10 @@
   "dependencies": {
     "gatsby": "^1.9.241",
     "gatsby-link": "^1.6.39",
+    "gatsby-plugin-offline": "^1.0.15",
     "gatsby-plugin-react-helmet": "^2.0.8",
     "gatsby-plugin-react-next": "^1.0.11",
-    "gatsby-plugin-sass": "latest",
+    "gatsby-plugin-sass": "^1.0.25",
     "gatsby-plugin-sitemap": "^1.2.20",
     "gatsby-source-filesystem": "^1.5.28",
     "gatsby-transformer-json": "^1.0.16",