diff --git a/wai-handler-fastcgi.cabal b/wai-handler-fastcgi.cabal
--- a/wai-handler-fastcgi.cabal
+++ b/wai-handler-fastcgi.cabal
@@ -1,5 +1,5 @@
 name:            wai-handler-fastcgi
-version:         0.4.1
+version:         0.4.2
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
@@ -17,7 +17,7 @@
     build-depends:   base              >= 4           && < 5
                    , wai               >= 0.4         && < 0.5
                    , wai-extra         >= 0.4         && < 0.5
-                   , bytestring        >= 0.9         && < 0.10
+                   , bytestring                >= 0.9.1.4  && < 0.10
     exposed-modules: Network.Wai.Handler.FastCGI
     ghc-options:     -Wall
     includes:        fcgiapp.h