diff --git a/warp.cabal b/warp.cabal
--- a/warp.cabal
+++ b/warp.cabal
@@ -1,5 +1,5 @@
 Name:                warp
-Version:             0.4.6.2
+Version:             0.4.6.3
 Synopsis:            A fast, light-weight web server for WAI applications.
 License:             BSD3
 License-file:        LICENSE
@@ -23,7 +23,7 @@
                    , transformers              >= 0.2.2    && < 0.3
                    , enumerator                >= 0.4.8    && < 0.5
                    , blaze-builder                 >= 0.2.1.4  && < 0.4
-                   , simple-sendfile               >= 0.1      && < 0.2
+                   , simple-sendfile               >= 0.1      && < 0.3
                    , http-types                    >= 0.6      && < 0.7
                    , case-insensitive              >= 0.2
                    , unix-compat                   >= 0.2