diff --git a/pkgs/tools/networking/siege/default.nix b/pkgs/tools/networking/siege/default.nix
index 976d8b3bc06..c4d68ee399a 100644
--- a/pkgs/tools/networking/siege/default.nix
+++ b/pkgs/tools/networking/siege/default.nix
@@ -1,18 +1,21 @@
-{ stdenv, fetchurl, openssl }:
+{ stdenv, fetchurl, openssl, zlib }:
 
 stdenv.mkDerivation rec {
-  name = "siege-3.0.8";
+  name = "siege-4.0.1";
 
   src = fetchurl {
     url = "http://download.joedog.org/siege/${name}.tar.gz";
-    sha256 = "15xj0cl64mzf89i0jknqg37rkrcaqmgs4755l74b4nmp4bky7ddq";
+    sha256 = "0dr8k64s7zlhy3w8n1br0h6xd06p09p9809l9rp13isf10jp5pgx";
   };
 
   NIX_LDFLAGS = stdenv.lib.optionalString stdenv.isLinux "-lgcc_s";
 
-  buildInputs = [ openssl ];
+  buildInputs = [ openssl zlib ];
 
-  configureFlags = [ "--with-ssl=${openssl.dev}" ];
+  configureFlags = [
+    "--with-ssl=${openssl.dev}"
+    "--with-zlib=${zlib.dev}"
+  ];
 
   meta = with stdenv.lib; {
     description = "HTTP load tester";