diff --git a/pdf-toolbox-core.cabal b/pdf-toolbox-core.cabal
--- a/pdf-toolbox-core.cabal
+++ b/pdf-toolbox-core.cabal
@@ -1,5 +1,5 @@
 name:                pdf-toolbox-core
-version:             0.0.2.0
+version:             0.0.2.1
 synopsis:            A collection of tools for processing PDF files.
 license:             BSD3
 license-file:        LICENSE
@@ -46,7 +46,7 @@
                        Pdf.Toolbox.Core.Util
                        Pdf.Toolbox.Core.Writer
   -- other-modules:       
-  build-depends:       base ==4.6.*,
+  build-depends:       base >= 4.6 && < 4.8,
                        bytestring,
                        io-streams,
                        attoparsec,