diff --git a/pkgs/tools/networking/ntp/default.nix b/pkgs/tools/networking/ntp/default.nix
index a131c567d89f..8a23eeb60f4f 100644
--- a/pkgs/tools/networking/ntp/default.nix
+++ b/pkgs/tools/networking/ntp/default.nix
@@ -3,11 +3,11 @@
 assert stdenv.isLinux -> libcap != null;
 
 stdenv.mkDerivation rec {
-  name = "ntp-4.2.8p3";
+  name = "ntp-4.2.8p4";
 
   src = fetchurl {
     url = "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/${name}.tar.gz";
-    sha256 = "13zkzcvjm5kbxl4xbcmaq07slplhmpkgahzcqnqlba3cxpra9341";
+    sha256 = "1fgxbhv0wyiivi6kh5zpzrd0yqmc48z7d3zmjspw9lj84mbn2s8d";
   };
 
   configureFlags = [