diff --git a/Formula/tkdiff.rb b/Formula/tkdiff.rb
index 0a2aa6c34c9..9670b14b84b 100644
--- a/Formula/tkdiff.rb
+++ b/Formula/tkdiff.rb
@@ -1,6 +1,6 @@
 class Tkdiff < Formula
   desc "Graphical side by side diff utility"
-  homepage "http://tkdiff.sourceforge.net/"
+  homepage "https://tkdiff.sourceforge.io/"
   url "https://downloads.sourceforge.net/project/tkdiff/tkdiff/4.2/tkdiff-4.2.tar.gz"
   sha256 "734bb417184c10072eb64e8d274245338e41b7fdeff661b5ef30e89f3e3aa357"