diff --git a/containers.cabal b/containers.cabal
--- a/containers.cabal
+++ b/containers.cabal
@@ -1,5 +1,5 @@
 name: containers
-version: 0.4.2.0
+version: 0.4.2.1
 license: BSD3
 license-file: LICENSE
 maintainer: fox@ucw.cz
@@ -20,7 +20,7 @@
     location: http://github.com/haskell/containers.git
 
 Library {
-    build-depends: base >= 4.2 && < 5, array, deepseq >= 1.2 && < 1.3
+    build-depends: base >= 4.2 && < 5, array, deepseq >= 1.2 && < 1.4
     ghc-options: -O2
     if impl(ghc>6.10)
         Ghc-Options: -fregs-graph