diff --git a/Formula/cweb.rb b/Formula/cweb.rb
index 2ab59124c7..65eb4708c7 100644
--- a/Formula/cweb.rb
+++ b/Formula/cweb.rb
@@ -1,8 +1,9 @@
 class Cweb < Formula
   desc "Literate documentation system for C, C++, and Java"
   homepage "https://cs.stanford.edu/~uno/cweb.html"
-  url "ftp://ftp.cs.stanford.edu/pub/cweb/cweb-3.64ad.tar.gz"
-  sha256 "1f0bb7aa35b8d43b721d588ed5003620d38de1959652f23bac2847ffcb922c0f"
+  url "https://www.ctan.org/tex-archive/web/c_cpp/cweb/cweb-3.64b.tar.gz"
+  mirror "ftp://ftp.cs.stanford.edu/pub/cweb/cweb-3.64b.tar.gz"
+  sha256 "038b0bf4d8297f0a98051ca2b4664abbf9d72b0b67963a2c7700d2f11cd25595"
 
   bottle do
     rebuild 1