diff --git a/src/CurrencyConverter.hs b/src/CurrencyConverter.hs
--- a/src/CurrencyConverter.hs
+++ b/src/CurrencyConverter.hs
@@ -8,7 +8,7 @@
 import Control.Monad (void)
 import Data.Maybe
 import Text.Printf
-import Text.Read     (readMaybe)
+import Safe          (readMay)
 
 #ifdef CABAL
 import qualified "threepenny-gui" Graphics.UI.Threepenny as UI
@@ -42,7 +42,7 @@
     dollarIn <- stepper "0" $ UI.valueChange dollar
     let
         rate = 0.7 :: Double
-        withString f = maybe "-" (printf "%.2f") . fmap f . readMaybe
+        withString f = maybe "-" (printf "%.2f") . fmap f . readMay
     
         dollarOut = withString (/ rate) <$> euroIn
         euroOut   = withString (* rate) <$> dollarIn
diff --git a/threepenny-gui.cabal b/threepenny-gui.cabal
--- a/threepenny-gui.cabal
+++ b/threepenny-gui.cabal
@@ -1,5 +1,5 @@
 Name:                threepenny-gui
-Version:             0.3.0.0
+Version:             0.3.0.1
 Synopsis:            GUI framework that uses the web browser as a display.
 Description:
     Threepenny-GUI is a GUI framework that uses the web browser as a display.
@@ -31,7 +31,7 @@
 License-file:        LICENSE
 Author:              Chris Done, Heinrich Apfelmus
 Maintainer:          Heinrich Apfelmus <apfelmus at quantentunnel dot de>
-Homepage:            http://github.com/HeinrichApfelmus/threepenny-gui
+Homepage:            http://www.haskell.org/haskellwiki/Threepenny-gui
 Category:            Web, GUI
 Build-type:          Simple
 Cabal-version:       >=1.8
@@ -84,8 +84,8 @@
   Build-depends:     base                      >= 4     && < 5
                     ,snap-server
                     ,snap-core
-                    ,websockets
-                    ,websockets-snap
+                    ,websockets == 0.7.*
+                    ,websockets-snap == 0.7.*
                     ,text
                     ,safe
                     ,containers
@@ -134,6 +134,7 @@
         cpp-options:       -DCABAL
         build-depends:     base                      >= 4     && < 5
                           ,threepenny-gui
+                          ,safe
     else
         buildable: False
     main-is:           CurrencyConverter.hs