diff --git a/abcnotation.cabal b/abcnotation.cabal
--- a/abcnotation.cabal
+++ b/abcnotation.cabal
@@ -1,6 +1,6 @@
 
 name:                   abcnotation
-version:                1.7
+version:                1.7.1
 synopsis:               Haskell representation and parser for ABC notation.
 author:                 Hans Hoglund
 maintainer:             Hans Hoglund
@@ -32,6 +32,6 @@
                         prettify,
                         parsec,
                         -- debug
-                        process
+                        process             >= 1.2 && < 1.3
     hs-source-dirs:     src
     default-language:   Haskell2010