diff --git a/music-score.cabal b/music-score.cabal
--- a/music-score.cabal
+++ b/music-score.cabal
@@ -1,6 +1,6 @@
 
 name:               music-score
-version:            1.2.1
+version:            1.2.2
 cabal-version:      >= 1.2
 author:             Hans Hoglund
 maintainer:         Hans Hoglund
@@ -28,6 +28,7 @@
         HCodecs,
         musicxml2,
         semigroups,
+        nats,
         semigroupoids,
         vector-space,
         music-pitch-literal,