diff --git a/threadmanager.cabal b/threadmanager.cabal
--- a/threadmanager.cabal
+++ b/threadmanager.cabal
@@ -1,5 +1,5 @@
 name:    threadmanager
-version: 0.1.3
+version: 0.1.4
 
 category: Concurrency
 
@@ -24,7 +24,7 @@
 library
     hs-source-dirs:  src
     exposed-modules: Control.Concurrent.ThreadManager
-    build-depends:   base == 4.*, containers >= 0.2 && < 0.4
+    build-depends:   base == 4.*, containers >= 0.2.0.0 && <= 0.4.0.0
     ghc-options:     -Wall
     if impl(ghc >= 6.8)
         ghc-options: -fwarn-tabs