diff --git a/lib/pbkdf.js b/lib/pbkdf.js
index 683af7c..cc5ce37 100644
--- a/lib/pbkdf.js
+++ b/lib/pbkdf.js
@@ -6,13 +6,14 @@ const { scrypt } = require ('scrypt-js');
  * creates a scrypt hash
  *
  * @param {string} str string input
- * @param {string} salt salt
+ * @param {string} salt salt#
+ * @param {(progress: number) => void} [progress] progress callback
  * @returns {Promise<string>} hash
  */
-async function pbkdf_scrypt (str, salt) {
+async function pbkdf_scrypt (str, salt, progress) {
   const bstr = Buffer.from (str.normalize ('NFKC'), 'utf-8');
   const bsalt = Buffer.from (salt.normalize ('NFKC'), 'utf-8');
-  const hash = await scrypt (bstr, bsalt, 8192, 8, 1, 64);
+  const hash = await scrypt (bstr, bsalt, 8192, 8, 1, 64, progress);
   return Buffer.from (hash)
     .toString ('hex');
 }
diff --git a/package.json b/package.json
index 3ed3ed6..e0769a8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@sapphirecode/crypto-helper",
-  "version": "2.1.1",
+  "version": "2.1.2",
   "main": "index.js",
   "author": {
     "name": "Timo Hocker",