diff --git a/Formula/krb5.rb b/Formula/krb5.rb
index 1a2203f6d04ee..af7e4abe9d7c9 100644
--- a/Formula/krb5.rb
+++ b/Formula/krb5.rb
@@ -1,8 +1,8 @@
 class Krb5 < Formula
   desc "Network authentication protocol"
   homepage "https://web.mit.edu/kerberos/"
-  url "https://kerberos.org/dist/krb5/1.20/krb5-1.20.1.tar.gz"
-  sha256 "704aed49b19eb5a7178b34b2873620ec299db08752d6a8574f95d41879ab8851"
+  url "https://kerberos.org/dist/krb5/1.21/krb5-1.21.tar.gz"
+  sha256 "69f8aaff85484832df67a4bbacd99b9259bd95aab8c651fbbe65cdc9620ea93b"
   license :cannot_represent
 
   livecheck do