diff --git a/xcb-types.cabal b/xcb-types.cabal
--- a/xcb-types.cabal
+++ b/xcb-types.cabal
@@ -1,5 +1,5 @@
 Name:         xcb-types
-Version:      0.6.1
+Version:      0.6.2
 Cabal-Version:  >= 1.6
 Synopsis:     Parses XML files used by the XCB project
 Description:   This package provides types which mirror the structures
@@ -30,7 +30,7 @@
 
 Library
 
- Build-depends: base == 4.*, xml == 1.3.*, pretty == 1.0.*, mtl == 2.0.*
+ Build-depends: base == 4.*, xml == 1.3.*, pretty == 1.0.* || == 1.1.*, mtl == 2.0.* || == 2.1.*
  Exposed-modules: Data.XCB,
                   Data.XCB.Types,
                   Data.XCB.Pretty,