diff --git a/HDBC-odbc.cabal b/HDBC-odbc.cabal
--- a/HDBC-odbc.cabal
+++ b/HDBC-odbc.cabal
@@ -1,5 +1,5 @@
 Name: HDBC-odbc
-Version: 2.0.0.0
+Version: 2.1.0.0
 Cabal-Version: >=1.2.3
 Build-type: Simple
 License: LGPL
@@ -33,7 +33,9 @@
     ExistentialQuantification,
     ForeignFunctionInterface,
     PatternSignatures
-  Build-Depends: base, mtl, HDBC>=2.0.0, utf8-string, bytestring
+  Build-Depends: base, mtl, HDBC>=2.1.0, utf8-string, bytestring
+  if impl(ghc >= 6.9)
+    Build-Depends: base >= 4
   GHC-Options: -O2
   C-Sources: hdbc-odbc-helper.c
   if os(mingw32) || os(win32)