diff --git a/Formula/ntp.rb b/Formula/ntp.rb
index 25431619e0..36648e4ca1 100644
--- a/Formula/ntp.rb
+++ b/Formula/ntp.rb
@@ -1,9 +1,9 @@
 class Ntp < Formula
   desc "The Network Time Protocol (NTP) Distribution"
   homepage "https://www.eecis.udel.edu/~mills/ntp/html/"
-  url "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p12.tar.gz"
-  version "4.2.8p12"
-  sha256 "709b222b5013d77d26bfff532b5ea470a8039497ef29d09363931c036cb30454"
+  url "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p13.tar.gz"
+  version "4.2.8p13"
+  sha256 "288772cecfcd9a53694ffab108d1825a31ba77f3a8466b0401baeca3bc232a38"
 
   bottle do
     rebuild 1