diff --git a/GraphRewriting/Layout/SpringEmbedder.hs b/GraphRewriting/Layout/SpringEmbedder.hs
--- a/GraphRewriting/Layout/SpringEmbedder.hs
+++ b/GraphRewriting/Layout/SpringEmbedder.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE FlexibleContexts #-}
 module GraphRewriting.Layout.SpringEmbedder where
 
 import GraphRewriting.Graph
diff --git a/graph-rewriting-layout.cabal b/graph-rewriting-layout.cabal
--- a/graph-rewriting-layout.cabal
+++ b/graph-rewriting-layout.cabal
@@ -1,5 +1,5 @@
 Name:          graph-rewriting-layout
-Version:       0.5.7
+Version:       0.5.8
 Copyright:     (c) 2010, Jan Rochel
 License:       BSD3
 License-File:  LICENSE