diff --git a/package.json b/package.json
index 9ff477f..8f7b3ae 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,8 @@
     "react": "^15.6.1",
     "react-helmet": "^5.2.0",
     "react-disqus-comments": "^1.1.1",
-    "gatsby-plugin-google-fonts": "latest"
+    "gatsby-plugin-google-fonts": "latest",
+    "prismjs": "^1.15.0"
   },
   "devDependencies": {
     "eslint": "^4.14.0",