diff --git a/pkgs/tools/networking/ntp/default.nix b/pkgs/tools/networking/ntp/default.nix
index de2fb1472aa..a990cb1ee92 100644
--- a/pkgs/tools/networking/ntp/default.nix
+++ b/pkgs/tools/networking/ntp/default.nix
@@ -8,11 +8,11 @@ let
 in
 
 stdenv.mkDerivation rec {
-  name = "ntp-4.2.8p12";
+  name = "ntp-4.2.8p13";
 
   src = fetchurl {
     url = "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/${name}.tar.gz";
-    sha256 = "0m04ndn0674kcf9x0aggjya07a3hlig2nlzzpwk7vmqka0mj56vh";
+    sha256 = "0f1a4fya7v5s0426nim8ydvvlcashb8hicgs9xlm76ndrz7751r8";
   };
 
   # The hardcoded list of allowed system calls for seccomp is