diff --git a/perl/.shipit b/perl/.shipit
index f9997c88..7b4dbc01 100644
--- a/perl/.shipit
+++ b/perl/.shipit
@@ -1,2 +1,3 @@
 steps = FindVersion, ChangeVersion, CheckChangeLog, DistTest, Commit, Tag, MakeDist, UploadCPAN
+MakeDist.destination=~/.shipit-dist/
 git.tagpattern = perl-%v
diff --git a/perl/Changes b/perl/Changes
index 091c875a..6e07966b 100644
--- a/perl/Changes
+++ b/perl/Changes
@@ -1,11 +1,16 @@
 
+0.31
+
+    - update Module::Install::XSUtil for ccache support (gfx)
+    - add version check at bootstrap in order to avoid load old .so (gfx)
+
 0.30
 
-    - fix utf8 mode not to be reseted by $unpacker->reset method
+    - fix utf8 mode not to be reseted by $unpacker->reset method (gfx)
 
 0.29
 
-    - add $unpacker->utf8 mode, decoding strings as UTF-8.
+    - add $unpacker->utf8 mode, decoding strings as UTF-8 (gfx)
 
 0.28
 
diff --git a/perl/Makefile.PL b/perl/Makefile.PL
index 219400f2..111b705c 100644
--- a/perl/Makefile.PL
+++ b/perl/Makefile.PL
@@ -1,8 +1,7 @@
 # Usage: Makefile.PL --pp # disable XS
 #        Makefile.PL -g   # add -g to the compiler and disable optimization flags
 use inc::Module::Install;
-use Module::Install::XSUtil 0.32;
-use Config;
+use Module::Install::XSUtil 0.36;
 
 name 'Data-MessagePack';
 all_from 'lib/Data/MessagePack.pm';
diff --git a/perl/lib/Data/MessagePack.pm b/perl/lib/Data/MessagePack.pm
index 01e0fc05..6d37d8f8 100644
--- a/perl/lib/Data/MessagePack.pm
+++ b/perl/lib/Data/MessagePack.pm
@@ -3,18 +3,18 @@ use strict;
 use warnings;
 use 5.008001;
 
-our $VERSION = '0.29';
+our $VERSION = '0.31';
 our $PreferInteger = 0;
 
 sub true () {
     require Data::MessagePack::Boolean;
-    no warnings 'once', 'redefine';
+    no warnings 'once';
     return $Data::MessagePack::Boolean::true;
 }
 
 sub false () {
     require Data::MessagePack::Boolean;
-    no warnings 'once', 'redefine';
+    no warnings 'once';
     return $Data::MessagePack::Boolean::false;
 }
 
diff --git a/perl/xs-src/MessagePack.c b/perl/xs-src/MessagePack.c
index 0c3c0b16..82ad1084 100644
--- a/perl/xs-src/MessagePack.c
+++ b/perl/xs-src/MessagePack.c
@@ -21,7 +21,7 @@ void init_Data__MessagePack_unpack(pTHX_ bool const cloning);
 
 XS(boot_Data__MessagePack) {
     dXSARGS;
-    PERL_UNUSED_VAR(items);
+    XS_VERSION_BOOTCHECK;
 
     init_Data__MessagePack_pack(aTHX_   false);
     init_Data__MessagePack_unpack(aTHX_ false);