diff --git a/pkgs/tools/networking/ntp/default.nix b/pkgs/tools/networking/ntp/default.nix
index 573ebec5869..70765e9e92d 100644
--- a/pkgs/tools/networking/ntp/default.nix
+++ b/pkgs/tools/networking/ntp/default.nix
@@ -3,10 +3,10 @@
 assert stdenv.isLinux -> libcap != null;
  
 stdenv.mkDerivation {
-  name = "ntp-4.2.2p4";
+  name = "ntp-4.2.4";
   src = fetchurl {
-    url = http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.2p4.tar.gz;
-    md5 = "916fe57525f8327f340b203f129088fa";
+    url = http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2.4.tar.gz;
+    md5 = "eb9147d26cbe18bd8fbec07f1df55aef";
   };
   configureFlags = "
     --without-crypto