Also change the version field of package.json in set-development-version task.

script/set-version

@@ -3,11 +3,11 @@
 set -e
 
 BUILT_PRODUCTS_DIR=$1
+VERSION=$2
 PLIST_PATH="$BUILT_PRODUCTS_DIR/Atom.app/Contents/Info.plist"
 HELPER_PLIST_PATH="$BUILT_PRODUCTS_DIR/Atom.app/Contents/Frameworks/Atom Helper.app/Contents/Info.plist"
 
 # Update version
-VERSION=$(git rev-parse --short HEAD | tr -d "\n")
 /usr/libexec/PlistBuddy -c "Set CFBundleShortVersionString $VERSION" "$PLIST_PATH"
 /usr/libexec/PlistBuddy -c "Set CFBundleVersion $VERSION" "$PLIST_PATH"
 /usr/libexec/PlistBuddy -c "Set CFBundleShortVersionString $VERSION" "$HELPER_PLIST_PATH"

tasks/set-development-version-task.coffee

@@ -1,3 +1,4 @@
+fs = require 'fs'
 path = require 'path'
 
 module.exports = (grunt) ->
@@ -6,27 +7,35 @@ module.exports = (grunt) ->
   grunt.registerTask 'set-development-version', 'Sets version to current SHA-1', ->
     done = @async()
 
-    if process.platform is 'darwin'
+    cmd = 'git'
-      cmd = 'script/set-version'
+    args = ['rev-parse', '--short', 'HEAD']
-      args = [grunt.config.get('atom.buildDir')]
+    spawn {cmd, args}, (error, result, code) ->
-      spawn {cmd, args}, (error, result, code) -> done(error)
+      return done(error) if error?
-    else if process.platform is 'win32'
-      shellAppDir = grunt.config.get('atom.shellAppDir')
-      shellExePath = path.join(shellAppDir, 'atom.exe')
 
-      cmd = 'git'
+      version = result.stdout.trim()
-      args = ['rev-parse', '--short', 'HEAD']
+      appDir = grunt.config.get('atom.appDir')
-      spawn {cmd, args}, (error, result, code) ->
-        if error?
-          done(error)
-        else
-          version = result.stdout.trim()
-          strings =
-            CompanyName: 'GitHub, Inc.'
-            FileDescription: 'The hackable, collaborative editor of tomorrow!'
-            LegalCopyright: 'Copyright (C) 2013 GitHub, Inc. All rights reserved'
-            ProductName: 'Atom'
-            ProductVersion: version
 
-          rcedit = require('rcedit')
+      # Replace version field of package.json.
-          rcedit(shellExePath, {'version-string': strings}, done)
+      packageJsonPath = path.join(appDir, 'package.json')
+      packageJson = require(packageJsonPath)
+      packageJson.version = version
+      packageJsonString = JSON.stringify(packageJson, null, 2)
+      fs.writeFileSync(packageJsonPath, packageJsonString)
+
+      if process.platform is 'darwin'
+        cmd = 'script/set-version'
+        args = [grunt.config.get('atom.buildDir'), version]
+        spawn {cmd, args}, (error, result, code) -> done(error)
+      else if process.platform is 'win32'
+        shellAppDir = grunt.config.get('atom.shellAppDir')
+        shellExePath = path.join(shellAppDir, 'atom.exe')
+
+        strings =
+          CompanyName: 'GitHub, Inc.'
+          FileDescription: 'The hackable, collaborative editor of tomorrow!'
+          LegalCopyright: 'Copyright (C) 2013 GitHub, Inc. All rights reserved'
+          ProductName: 'Atom'
+          ProductVersion: version
+
+        rcedit = require('rcedit')
+        rcedit(shellExePath, {'version-string': strings}, done)