diff --git a/lib/urlsafe-base64.js b/lib/urlsafe-base64.js
index 7f26afa..068a4e2 100644
--- a/lib/urlsafe-base64.js
+++ b/lib/urlsafe-base64.js
@@ -56,7 +56,7 @@ exports.decode = function decode(base64) {
     .replace(/\-/g, '+') // Convert '-' to '+'
     .replace(/\_/g, '/'); // Convert '_' to '/'
 
-  return new Buffer(base64, 'base64');
+  return Buffer.from(base64).toString('base64');
 
 };
 
@@ -74,4 +74,4 @@ exports.validate = function validate(base64) {
 
   return /^[A-Za-z0-9\-_]+$/.test(base64);
 
-};
\ No newline at end of file
+};