diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -89,6 +89,13 @@
 [Github](https://github.com/dan-t/cabal-bounds)
 [Hackage](http://hackage.haskell.org/package/cabal-bounds)
 
+cabal-constraints - Repeatable builds for cabalized Haskell projects
+[Github](https://github.com/benarmston/cabal-constraints)
+[Hackage](http://hackage.haskell.org/package/cabal-constraints)
+
+cabal-freeze - hopefully will appear in `cabal` soon.
+[Github ticket](https://github.com/haskell/cabal/pull/1519)
+
 ## License
 
 sunlight is licensed under the BSD license.
diff --git a/lib/Test/Sunlight/Shell.hs b/lib/Test/Sunlight/Shell.hs
--- a/lib/Test/Sunlight/Shell.hs
+++ b/lib/Test/Sunlight/Shell.hs
@@ -50,14 +50,10 @@
   hClose hin
   return (out, err, h)
   where
-    cp = CreateProcess { cmdspec = RawCommand c as
-                       , cwd = Nothing
-                       , env = Nothing
-                       , std_in = CreatePipe
-                       , std_out = CreatePipe
-                       , std_err = CreatePipe
-                       , close_fds = True
-                       , create_group = False }
+    cp = (proc c as) { std_in = CreatePipe
+                     , std_out = CreatePipe
+                     , std_err = CreatePipe
+                     , close_fds = True }
 
 bufsize :: Int
 bufsize = 512
diff --git a/sunlight-test.hs b/sunlight-test.hs
--- a/sunlight-test.hs
+++ b/sunlight-test.hs
@@ -7,12 +7,13 @@
 
 import Test.Sunlight
 
+ghc s = (s, "ghc-" ++ s, "ghc-pkg-" ++ s)
+
 inputs = TestInputs
   { tiDescription = Nothing
   , tiCabal = "cabal"
-  , tiLowest = ("7.4", "ghc-7.4", "ghc-pkg-7.4")
-  , tiDefault = [ ("7.4", "ghc-7.4", "ghc-pkg-7.4")
-                , ("7.6", "ghc-7.6", "ghc-pkg-7.6") ]
+  , tiLowest = ghc "7.4.1"
+  , tiDefault = map ghc ["7.4.1", "7.6.3", "7.8.2"]
   , tiTest = []
   }
 
diff --git a/sunlight.cabal b/sunlight.cabal
--- a/sunlight.cabal
+++ b/sunlight.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                sunlight
-version:             0.4.0.0
+version:             0.6.0.0
 synopsis:            Test Cabalized package against multiple dependency versions
 
 description:         
@@ -40,15 +40,15 @@
       Test.Sunlight.Shell
 
   build-depends:
-      base >=4.5.1.0 && < 5
-    , directory >= 1.1.0.2
-    , bytestring >= 0.9.2.1
-    , Cabal >= 1.14.0
-    , process >= 1.1.0.1
-    , tuple >= 0.2.0.1
-    , time >= 1.4
-    , old-locale >= 1.0.0.4
-    , random >= 1.0.0.0
+      base >=4.5.0.0 && < 4.8
+    , directory >= 1.1.0.2 && < 1.3
+    , bytestring >= 0.9.2.1 && < 0.11
+    , Cabal >= 1.14.0 && < 1.19
+    , process >= 1.1.0.1 && < 1.3
+    , tuple >= 0.2.0.1 && < 0.3
+    , time >= 1.4 && < 1.5
+    , old-locale >= 1.0.0.4 && < 1.1
+    , random >= 1.0.1.1 && < 1.1
 
   hs-source-dirs:      lib
   ghc-options: -Wall