diff --git a/lib/read-package-json.js b/lib/read-package-json.js
index 1497ebf..e367630 100644
--- a/lib/read-package-json.js
+++ b/lib/read-package-json.js
@@ -10,8 +10,11 @@
 // Requirements
 //------------------------------------------------------------------------------
 
+const fs = require("fs")
 const joinPath = require("path").join
-const readPkg = require("read-pkg")
+const parseJson5 = require("json5").parse
+const parseJson = require("load-json-file")
+const normalizePackageData = require("normalize-package-data")
 
 //------------------------------------------------------------------------------
 // Public Interface
@@ -20,12 +23,33 @@ const readPkg = require("read-pkg")
 /**
  * Reads the package.json in the current directory.
  *
- * @returns {object} package.json's information.
+ * @returns {Promise<object>} package.json's information.
  */
 module.exports = function readPackageJson() {
-    const path = joinPath(process.cwd(), "package.json")
-    return readPkg(path).then(body => ({
-        taskList: Object.keys(body.scripts || {}),
-        packageInfo: { path, body },
-    }))
+    try {
+        let path = joinPath(process.cwd(), "package.json5")
+        let bodyPromise = null
+
+        if (fs.existsSync(path)) {
+            // Read package.json5
+            const rawPkg = fs.readFileSync(path, "utf8")
+            bodyPromise = Promise.resolve(parseJson5(rawPkg))
+        }
+        else {
+            // Read package.json
+            path = joinPath(process.cwd(), "package.json")
+            bodyPromise = parseJson(path)
+        }
+
+        return bodyPromise.then(body => {
+            normalizePackageData(body)
+            return {
+                taskList: Object.keys(body.scripts || {}),
+                packageInfo: { path, body },
+            }
+        })
+    }
+    catch (err) {
+        return Promise.reject(err)
+    }
 }
diff --git a/package.json b/package.json
index f130b86..35a84a5 100644
--- a/package.json
+++ b/package.json
@@ -32,10 +32,12 @@
     "ansi-styles": "^3.2.1",
     "chalk": "^2.4.1",
     "cross-spawn": "^6.0.5",
+    "json5": "^2.2.3",
+    "load-json-file": "^4.0.0",
     "memorystream": "^0.3.1",
     "minimatch": "^3.0.4",
+    "normalize-package-data": "^2.5.0",
     "pidtree": "^0.3.0",
-    "read-pkg": "^3.0.0",
     "shell-quote": "^1.6.1",
     "string.prototype.padend": "^3.0.0"
   },
diff --git a/test-workspace/json5/package.json5 b/test-workspace/json5/package.json5
new file mode 100644
index 0000000..ceabac2
--- /dev/null
+++ b/test-workspace/json5/package.json5
@@ -0,0 +1,22 @@
+{
+  /*
+   * Test comment
+   */
+
+  name: "npm-run-all-json5-test",
+  version: "0.0.0",
+  private: true,
+  description: "",
+  engines: {
+    node: ">=4",
+  },
+  config: {
+    test: "OK",
+  },
+  repository: {
+    type: "git",
+    url: "https://github.com/mysticatea/npm-run-all.git",
+  },
+  author: "Toru Nagashima",
+  license: "MIT",
+}
diff --git a/test/json5.js b/test/json5.js
new file mode 100644
index 0000000..7cb67b6
--- /dev/null
+++ b/test/json5.js
@@ -0,0 +1,32 @@
+/**
+ * @author Toru Nagashima
+ * @copyright 2016 Toru Nagashima. All rights reserved.
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("power-assert")
+const readPackageJson = require("../lib/read-package-json")
+
+//------------------------------------------------------------------------------
+// Test
+//------------------------------------------------------------------------------
+
+describe("[json5]", () => {
+    before(() => process.chdir("test-workspace/json5"))
+    after(() => process.chdir("../.."))
+
+    it("should read package.json5 when available", () =>
+        readPackageJson()
+            .then(result => assert(result.packageInfo.path.endsWith("/package.json5")))
+    )
+
+    it("should parse package.json5", () =>
+        readPackageJson()
+            .then(result => assert(result.packageInfo.body.name === "npm-run-all-json5-test"))
+    )
+})