diff --git a/roundtrip.cabal b/roundtrip.cabal
--- a/roundtrip.cabal
+++ b/roundtrip.cabal
@@ -1,5 +1,5 @@
 Name:           roundtrip
-Version:        0.2.0.5
+Version:        0.2.0.6
 Synopsis:       Bidirectional (de-)serialization
 Description:    Roundtrip allows the definition of bidirectional
                 (de-)serialization specifications. The specification language
@@ -21,14 +21,15 @@
 Maintainer:     Stefan Wehr <wehr@factisresearch.com>,
 Category:       Text
 Build-type:     Simple
-Cabal-version:  >=1.8
+Cabal-version:  >=1.10
 
 Source-repository head
-  Type:     darcs
-  location: http://darcs.factisresearch.com/pub/roundtrip
+  Type:     git
+  location: https://github.com/factisresearch/roundtrip
 
 Library
   Hs-Source-Dirs: src
+  Default-language: Haskell2010
   Exposed-modules:
       Text.Roundtrip
     , Text.Roundtrip.Combinators
@@ -41,7 +42,7 @@
     , Control.Isomorphism.Partial.Constructors
     , Control.Isomorphism.Partial.Derived
   Build-depends:
-      base >= 4 && < 5
+      base >= 4.6 && < 5
     , safe
     , containers
     , text
diff --git a/src/Text/Roundtrip/SpecPrinter.hs b/src/Text/Roundtrip/SpecPrinter.hs
--- a/src/Text/Roundtrip/SpecPrinter.hs
+++ b/src/Text/Roundtrip/SpecPrinter.hs
@@ -6,7 +6,7 @@
 
 ) where
 
-import Prelude hiding (catch)
+import Prelude hiding (catch, (<>))
 
 import Control.Exception (AsyncException, catch)
 import qualified Data.Text as T