diff --git a/src/Tokens.php b/src/Tokens.php
index <HASH>..<HASH> 100644
--- a/src/Tokens.php
+++ b/src/Tokens.php
@@ -135,6 +135,7 @@ class Tokens
 
         try {
             $validate->structure();
+            $validate->algorithmNotNone();
             $validate->signature();
             return true;
         } catch (ValidateException $e) {
Added algorithmNotNone check to Tokens Validate method to fix security flaw.