diff --git a/lib/index.js b/lib/index.js
index e0acd72..c4c8b21 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,6 +7,8 @@ import retry from 'async-retry';
 import Agent from './agent';
 import EventEmitter from 'events';
 import { basename, resolve as resolvePath } from 'path';
+import { homedir } from 'os';
+import { parse as parseIni } from 'ini';
 import { stat, readFile } from 'fs-promise';
 import resumer from 'resumer';
 import splitArray from 'split-array';
@@ -61,6 +63,26 @@ export default class Now extends EventEmitter {
       throw e;
     }
 
+    // Read .npmrc
+    let npmrc;
+    try {
+      npmrc = await readFile(resolvePath(path, '.npmrc'), 'utf8');
+      npmrc = parseIni(npmrc);
+    } catch (err) {
+      // Do nothing
+    }
+
+    if (!npmrc) {
+      try {
+        npmrc = await readFile(resolvePath(homedir(), '.npmrc'), 'utf8');
+        npmrc = parseIni(npmrc);
+      } catch (err) {
+        // Do nothing
+      }
+    }
+
+    const authToken = npmrc['//registry.npmjs.org/:_authToken'];
+
     if (this._debug) console.time('> [debug] Getting files');
     const files = await getFiles(path, pkg, { debug: this._debug });
     if (this._debug) console.timeEnd('> [debug] Getting files');
@@ -83,6 +105,7 @@ export default class Now extends EventEmitter {
           forceSync,
           name: pkg.name || basename(path),
           description: pkg.description,
+          registryAuthToken: authToken,
           // Flatten the array to contain files to sync where each nested input
           // array has a group of files with the same sha but different path
           files: Array.prototype.concat.apply([], Array.from(this._files).map(([sha, { data, names }]) => {
diff --git a/package.json b/package.json
index 5f64116..56895c5 100644
--- a/package.json
+++ b/package.json
@@ -62,6 +62,7 @@
     "email-validator": "1.0.4",
     "fs-promise": "0.5.0",
     "graceful-fs": "4.1.4",
+    "ini": "1.3.4",
     "minimatch": "3.0.0",
     "minimist": "1.2.0",
     "ms": "0.7.1",