diff --git a/fft.cabal b/fft.cabal
--- a/fft.cabal
+++ b/fft.cabal
@@ -1,5 +1,5 @@
 name:                fft
-version:             0.1.8
+version:             0.1.8.1
 synopsis:            Bindings to the FFTW library.
 description:
                      Bindings to the FFTW library.
@@ -20,7 +20,7 @@
 flag base4
 
 source-repository this
-  tag:         0.1.8
+  tag:         0.1.8.1
   type:        darcs
   location:    http://code.haskell.org/fft/
 
@@ -38,7 +38,7 @@
   else
     build-depends: base <3
   if flag(base4)
-    build-depends: base >=4 && <5, syb >=0.1 && <0.5
+    build-depends: base >=4 && <5, syb >=0.1 && <0.6
   else
     build-depends: base <4