diff --git a/extensible-data.cabal b/extensible-data.cabal
--- a/extensible-data.cabal
+++ b/extensible-data.cabal
@@ -7,7 +7,7 @@
 -- The package version. See the Haskell package versioning policy
 -- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
 -- standards guiding when and how versions should be incremented.
-Version:             0.1
+Version:             0.1.0.1
 
 -- A short (one-line) description of the package.
 Synopsis:            Sums/products/lists/trees which can be extended in other modules
@@ -52,7 +52,7 @@
   
   -- Packages needed in order to build this package.
   Build-depends:
-    base >= 4.3 && < 4.4,
+    base >= 4.3 && < 5.0,
     data-lens >= 2.0.1 && < 2.2, 
     hashable >= 1.0.1.1 && < 1.2,
     template-haskell >= 2.5.0.0 && < 2.6,