diff --git a/filecache.cabal b/filecache.cabal
--- a/filecache.cabal
+++ b/filecache.cabal
@@ -1,5 +1,5 @@
 name:                filecache
-version:             0.4.0
+version:             0.4.1
 synopsis:            A cache system associating values to files.
 description:         A cache system, that works by associating computation results with file names. When the files are modified, the cache entries are discarded.
 homepage:            http://lpuppet.banquise.net/
@@ -32,7 +32,7 @@
   hs-source-dirs:      src
   -- other-modules:
   build-depends:       base               >= 4.6   && < 5
-                     , containers         == 0.5.*
+                     , containers           >= 0.5     && < 0.7
                      , directory          >= 1.2   && < 1.4
                      , fsnotify           == 0.3.*
                      , strict-base-types  >= 0.2.2