diff --git a/hierarchical-clustering.cabal b/hierarchical-clustering.cabal
--- a/hierarchical-clustering.cabal
+++ b/hierarchical-clustering.cabal
@@ -1,5 +1,5 @@
 Name:                hierarchical-clustering
-Version:             0.4
+Version:             0.4.1
 Synopsis:            Fast algorithms for single, average/UPGMA and complete linkage clustering.
 License:             BSD3
 License-file:        LICENSE
@@ -87,7 +87,7 @@
     Data.Clustering.Hierarchical.Internal.Types
   Build-depends:
       base       == 4.*
-    , array      == 0.3.*
+    , array      >= 0.3 && < 0.5
     , containers >= 0.3 && < 0.5
   GHC-options: -Wall