diff --git a/musicxml2.cabal b/musicxml2.cabal
--- a/musicxml2.cabal
+++ b/musicxml2.cabal
@@ -1,6 +1,6 @@
 
 name:               musicxml2
-version:            1.4
+version:            1.4.1
 cabal-version:      >= 1.2
 author:             Hans Hoglund
 maintainer:         Hans Hoglund
@@ -17,8 +17,8 @@
 library                    
     build-depends: 
         base >= 4 && < 5,
-        semigroups, data-default, type-unary, reverse-apply,
-        xml, 
+        semigroups, nats, data-default, type-unary, reverse-apply,
+        xml,
         music-pitch-literal,
         music-dynamics-literal