diff --git a/packages/gatsby-source-hacker-news/package.json b/packages/gatsby-source-hacker-news/package.json
index d1d5c0e396e92..c21c0234ba7c0 100644
--- a/packages/gatsby-source-hacker-news/package.json
+++ b/packages/gatsby-source-hacker-news/package.json
@@ -25,13 +25,12 @@
   ],
   "license": "MIT",
   "peerDependencies": {
-    "gatsby": "^2.0.0"
+    "gatsby": "^2.0.15"
   },
   "repository": "https://github.com/gatsbyjs/gatsby/tree/master/packages/gatsby-source-hacker-news",
   "scripts": {
     "build": "babel src --out-dir . --ignore **/__tests__",
     "prepare": "cross-env NODE_ENV=production npm run build",
     "watch": "babel -w src --out-dir . --ignore **/__tests__"
-  },
-  "gitHead": "5bd5aebe066b9875354a81a4b9ed98722731c465"
+  }
 }
diff --git a/packages/gatsby-source-hacker-news/src/gatsby-node.js b/packages/gatsby-source-hacker-news/src/gatsby-node.js
index e53b2e2b06a9e..85c94aabd9d87 100644
--- a/packages/gatsby-source-hacker-news/src/gatsby-node.js
+++ b/packages/gatsby-source-hacker-news/src/gatsby-node.js
@@ -10,9 +10,8 @@ const get = query =>
 
 exports.sourceNodes = async ({
   actions,
-  getNode,
+  createContentDigest,
   createNodeId,
-  hasNodeChanged,
 }) => {
   const { createNode } = actions
 
@@ -117,10 +116,7 @@ fragment commentsFragment on HackerNewsItem {
     storyNode.by = storyNode.by.id
 
     // Get content digest of node.
-    const contentDigest = crypto
-      .createHash(`md5`)
-      .update(JSON.stringify(storyNode))
-      .digest(`hex`)
+    const contentDigest = createContentDigest(storyNode)
 
     storyNode.internal.contentDigest = contentDigest
     createNode(storyNode)