diff --git a/roundtrip-string.cabal b/roundtrip-string.cabal
--- a/roundtrip-string.cabal
+++ b/roundtrip-string.cabal
@@ -1,5 +1,5 @@
 Name:           roundtrip-string
-Version:        0.1.0.0
+Version:        0.1.0.1
 Synopsis:       Bidirectional (de-)serialization
 Description:    Roundtrip allows the definition of bidirectional
                 (de-)serialization specifications. This package provides
@@ -22,7 +22,7 @@
       Text.Roundtrip.Parser
     , Text.Roundtrip.Printer
   Build-depends:
-      base == 4.*
-    , mtl >= 1.1.1.1
-    , parsec == 3.1.*
-    , roundtrip == 0.2.*
+      base >= 4 && < 5
+    , mtl
+    , parsec
+    , roundtrip