--- lib/Crypt/PasswdMD5.pm
+++ lib/Crypt/PasswdMD5.pm
@@ -3,7 +3,7 @@ package Crypt::PasswdMD5;
 use strict;
 use warnings;
 
-use Digest::MD5;
+use Digest::MD5 2.53;
 
 use Exporter 'import';