Increased bundle size after gatsby build

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Recently I updated the plugin and saw a major increase in my bundle size. With v2.1.1 the size of public/app*.js was 360K which goes to 1.1M when building with v2.1.3. I just build the app with different of this plugin and didn't touch any of the code.

Below is the final build of my app with different versions of the plugin.

gatsby-plugin-material-ui: v2.1.1

-rw-rw-r-- 1 hello hello  20K Jul  2 14:42 public/10-ebe60cce32bd9ed2f0c5.js
-rw-rw-r-- 1 hello hello 360K Jul  2 14:42 public/app-59946657d0e4b7a8e1e8.js
-rw-rw-r-- 1 hello hello 2.3K Jul  2 14:42 public/component---src-pages-404-js-061263c378e3b117d776.js
-rw-rw-r-- 1 hello hello 6.1K Jul  2 14:42 public/component---src-pages-about-js-7c9c919efea8e8037a34.js
-rw-rw-r-- 1 hello hello 9.6K Jul  2 14:42 public/component---src-pages-blog-js-80e2624fc6d7249a3408.js
-rw-rw-r-- 1 hello hello 3.0K Jul  2 14:42 public/component---src-pages-contact-js-f8bf0b800be27a24409a.js
-rw-rw-r-- 1 hello hello 4.1K Jul  2 14:42 public/component---src-pages-index-js-d7fbf0f78749f602a59a.js
-rw-rw-r-- 1 hello hello  11K Jul  2 14:42 public/component---src-templates-blog-js-7c9f8a26f63d6327760f.js
-rw-rw-r-- 1 hello hello  104 Jul  2 14:42 public/styles-020a56298d1688f62e7b.js
-rw-rw-r-- 1 hello hello 2.6K Jul  2 14:42 public/webpack-runtime-093a3457aed3d7d10e1a.js

gatsby-plugin-material-ui: v2.1.3

-rw-rw-r-- 1 hello hello  20K Jul  2 14:37 public/10-1af1c46abb5c90e26110.js
-rw-rw-r-- 1 hello hello 1.1M Jul  2 14:37 public/app-6038e3b0fdefa64eac2a.js
-rw-rw-r-- 1 hello hello 2.3K Jul  2 14:37 public/component---src-pages-404-js-dc81a6b33d26e3acd251.js
-rw-rw-r-- 1 hello hello 6.1K Jul  2 14:37 public/component---src-pages-about-js-7ea57f97fe75d6617b59.js
-rw-rw-r-- 1 hello hello 9.6K Jul  2 14:37 public/component---src-pages-blog-js-f0585bba9eaadad47228.js
-rw-rw-r-- 1 hello hello 3.0K Jul  2 14:37 public/component---src-pages-contact-js-879bd071ae7b5ea9eabb.js
-rw-rw-r-- 1 hello hello 4.1K Jul  2 14:37 public/component---src-pages-index-js-477adb6a7b524c907d48.js
-rw-rw-r-- 1 hello hello  11K Jul  2 14:37 public/component---src-templates-blog-js-4125d7b8fcc5043a478f.js
-rw-rw-r-- 1 hello hello  104 Jul  2 14:37 public/styles-a6fef45c2fb19a05e4df.js
-rw-rw-r-- 1 hello hello 2.6K Jul  2 14:37 public/webpack-runtime-a1a2edf5579bbbba34b9.js

Packages

"@material-ui/core": "^4.1.3" "@material-ui/icons": "^4.2.1" "@material-ui/styles": "^4.1.2" "gatsby": "^2.12.0"