diff --git a/interpolation.cabal b/interpolation.cabal
--- a/interpolation.cabal
+++ b/interpolation.cabal
@@ -1,5 +1,5 @@
 Name:             interpolation
-Version:          0.1.0.2
+Version:          0.1.0.3
 License:          BSD3
 License-File:     LICENSE
 Author:           Henning Thielemann
@@ -47,7 +47,7 @@
   default:     True
 
 Source-Repository this
-  Tag:         0.1.0.2
+  Tag:         0.1.0.3
   Type:        darcs
   Location:    http://hub.darcs.net/thielema/interpolation/
 
@@ -112,6 +112,7 @@
     Test.Piece
     Test.Sample
     Test.Overlap
+    Numeric.Interpolation.Private.Piece
   Hs-Source-Dirs:      test, private
   GHC-Options:         -Wall
   Build-Depends:
@@ -119,5 +120,5 @@
     QuickCheck >=2.4 && <3,
     utility-ht >=0.0.9 && <0.1,
     array >=0.4 && <0.6,
-    containers >=0.4 && <0.6,
+    containers >=0.4 && <0.7,
     base >=4.5 && <5