diff --git a/perl/Changes b/perl/Changes
index 33fb36c2..15603ea1 100644
--- a/perl/Changes
+++ b/perl/Changes
@@ -1,3 +1,7 @@
+0.05
+
+    - change type detection for old perl
+
 0.04
 
     - check SvROK first(reported by yappo++)
diff --git a/perl/lib/Data/MessagePack.pm b/perl/lib/Data/MessagePack.pm
index c61cac02..46fb45d9 100644
--- a/perl/lib/Data/MessagePack.pm
+++ b/perl/lib/Data/MessagePack.pm
@@ -4,7 +4,7 @@ use warnings;
 use XSLoader;
 use 5.008001;
 
-our $VERSION = '0.04';
+our $VERSION = '0.05';
 our $PreferInteger = 0;
 
 XSLoader::load(__PACKAGE__, $VERSION);