diff --git a/bamboo.cabal b/bamboo.cabal
--- a/bamboo.cabal
+++ b/bamboo.cabal
@@ -1,5 +1,5 @@
 Name:                 bamboo
-Version:              2009.5.18.2
+Version:              2009.5.19
 Build-type:           Simple
 Synopsis:             A simple blog middleware on hack
 Description:          A simple blog middleware on hack
@@ -15,7 +15,7 @@
 
 library
   ghc-options: -Wall -fno-warn-missing-signatures -fno-warn-name-shadowing -fno-warn-orphans -fno-warn-type-defaults
-  build-depends: base, cgi, network, haskell98, old-locale, old-time, time, unix, bytestring, base64-string, zlib, directory, filepath, containers, process,parsedate >= 3000.0.0, rss >= 3000.0.1, xhtml, utf8-string >= 0.3.3, pandoc, parsec >= 2, gravatar >= 0.3, data-default >= 0.2,  mps >= 2009.5.13, hcheat >= 2009.5.13, hack >= 2009.4.52, hack-contrib >= 2009.5.13, tokyocabinet-haskell >= 0.0.5
+  build-depends: base, cgi, network, haskell98, old-locale, old-time, time, unix, bytestring, base64-string, zlib, directory, filepath, containers, process,parsedate >= 3000.0.0, rss >= 3000.0.1, xhtml, utf8-string >= 0.3.3, pandoc, parsec >= 2, gravatar >= 0.3, data-default >= 0.2,  mps >= 2009.5.13, hcheat >= 2009.5.13, hack >= 2009.5.19, hack-contrib >= 2009.5.19, tokyocabinet-haskell >= 0.0.5
   hs-source-dirs: src/
   exposed-modules:  
                     Bamboo
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,10 @@
+2009.5.19
+---------
+
+### Feature
+
+* for hack 5.19
+
 2009.5.18.2
 -----------
 
diff --git a/readme.md b/readme.md
--- a/readme.md
+++ b/readme.md
@@ -52,11 +52,24 @@
 
 [jinjing's blog config file](http://github.com/nfjinjing/jinjing-blog/blob/401a541443d88bbf8d844874c1473d4b3bc81784/config/site.txt)
 
-## Install
+## Install in 3 steps
 
-### Install Bamboo Middleware
+### 1. tokyo-cabinet (used for caching)
 
+#### Mac
 
+    port install tokyocabinet
+    
+#### Arch
+
+    yaourt -S tokyocabinet
+
+#### other distro
+    
+Just find this tokyo-cabinet package and install it :)
+
+### 2. Bamboo Middleware
+
 #### update cabal
 
     cabal update
@@ -67,7 +80,7 @@
     cabal install rss --reinstall
     cabal install bamboo
 
-### Pick a hack handler
+### 3. Pick any hack handler
 
 #### Happstack
 
diff --git a/src/Bamboo/Helper/Helper.hs b/src/Bamboo/Helper/Helper.hs
--- a/src/Bamboo/Helper/Helper.hs
+++ b/src/Bamboo/Helper/Helper.hs
@@ -27,6 +27,8 @@
 import qualified Hack.Contrib.Request as Request
 import Hack.Contrib.Response
 import Hack.Contrib.Constants
+import Hack.Contrib.Utils
+import qualified Data.ByteString.Lazy.Char8 as B
 
 gt = (P.>)
 
@@ -112,7 +114,7 @@
 output_plain_html x = 
   def 
     .set_status 200
-    .set_body (x.unescape_unicode_xml.u2b)
+    .set_body (x.unescape_unicode_xml.u2b.B.pack)
     .set_content_type _TextHtmlUTF8
     .return