diff --git a/Test/Tasty/Options.hs b/Test/Tasty/Options.hs
--- a/Test/Tasty/Options.hs
+++ b/Test/Tasty/Options.hs
@@ -27,6 +27,7 @@
 import Data.Monoid
 
 import Options.Applicative
+import Options.Applicative.Types
 
 -- | An option is a data type that inhabits the `IsOption` type class.
 class Typeable v => IsOption v where
@@ -60,8 +61,9 @@
       name = untag (optionName :: Tagged v String)
       helpString = untag (optionHelp :: Tagged v String)
       parse =
+        ReadM .
         maybe (Left (ErrorMsg $ "Could not parse " ++ name)) Right .
-          parseValue
+        parseValue
 
 
 data OptionValue = forall v . IsOption v => OptionValue v
diff --git a/Test/Tasty/UI.hs b/Test/Tasty/UI.hs
--- a/Test/Tasty/UI.hs
+++ b/Test/Tasty/UI.hs
@@ -98,6 +98,9 @@
 
   hSetBuffering stdout NoBuffering
 
+  -- Do not retain the reference to the tree more than necessary
+  _ <- evaluate alignment
+
   st <-
     flip execStateT initialState $ getApp $ fst $
       foldTestTree
diff --git a/tasty.cabal b/tasty.cabal
--- a/tasty.cabal
+++ b/tasty.cabal
@@ -2,7 +2,7 @@
 --  see http://haskell.org/cabal/users-guide/
 
 name:                tasty
-version:             0.3
+version:             0.3.1
 synopsis:            Modern and extensible testing framework
 description:         See <http://documentup.com/feuerbach/tasty>
 license:             MIT
@@ -44,7 +44,7 @@
     mtl,
     tagged >= 0.5,
     regex-posix,
-    optparse-applicative >= 0.5
+    optparse-applicative >= 0.6
 
   if flag(colors)
     build-depends: ansi-terminal