diff --git a/pkgs/tools/security/nmap/default.nix b/pkgs/tools/security/nmap/default.nix
index 57cc9c242483..faba4037d3dd 100644
--- a/pkgs/tools/security/nmap/default.nix
+++ b/pkgs/tools/security/nmap/default.nix
@@ -13,11 +13,11 @@
 with stdenv.lib;
 stdenv.mkDerivation rec {
   name = "nmap${optionalString graphicalSupport "-graphical"}-${version}";
-  version = "6.47";
+  version = "6.49BETA4";
 
   src = fetchurl {
     url = "http://nmap.org/dist/nmap-${version}.tar.bz2";
-    sha256 = "14d53aji4was68c01pf105n5ylha257wmdbx40ddiqiw42g1x8cg";
+    sha256 = "042fg73w7596b3h6ha9y62ckc0hd352zv1shwip3dx14v5igrsna";
   };
 
   patches = ./zenmap.patch;