diff --git a/doctest.cabal b/doctest.cabal
--- a/doctest.cabal
+++ b/doctest.cabal
@@ -1,5 +1,5 @@
 name:                doctest
-version:             0.4.0
+version:             0.4.1
 stability:           experimental
 synopsis:            Test interactive Haskell examples
 description:         The doctest program checks examples in source code comments.
@@ -33,16 +33,16 @@
                     , DocTest
 
     build-depends:
-                       base       >= 4.0  && < 4.4
+                       base       >= 4.0  && < 4.5
                      , containers >= 0.3  && < 0.5
                      , haddock    >= 2.8  && < 2.10
-                     , ghc        >= 6.12 && < 7.2
+                     , ghc        >= 6.12 && < 7.4
                      , ghc-paths  == 0.1.*
                      , HUnit      == 1.2.*
-                     , process    == 1.0.*
+                     , process    >= 1.0 &&  < 1.2
 
 executable doctest
-    ghc-options:     -Wall
+    ghc-options:     -Wall -threaded
     hs-source-dirs:  src
     main-is:         Main.hs
     other-modules:
@@ -53,10 +53,10 @@
                     , DocTest
 
     build-depends:
-                       base       >= 4.0  && < 4.4
+                       base       >= 4.0  && < 4.5
                      , containers >= 0.3  && < 0.5
                      , haddock    >= 2.8  && < 2.10
-                     , ghc        >= 6.12 && < 7.2
+                     , ghc        >= 6.12 && < 7.4
                      , ghc-paths  == 0.1.*
                      , HUnit      == 1.2.*
-                     , process    == 1.0.*
+                     , process    >= 1.0 &&  < 1.2