diff --git a/Library/Homebrew/livecheck/strategy/gnu.rb b/Library/Homebrew/livecheck/strategy/gnu.rb
index fd335915ae..d78a90971c 100644
--- a/Library/Homebrew/livecheck/strategy/gnu.rb
+++ b/Library/Homebrew/livecheck/strategy/gnu.rb
@@ -66,7 +66,7 @@ module Homebrew
           return values if match.blank?
 
           # The directory listing page for the project's files
-          values[:url] = "https://ftp.gnu.org/gnu/#{match[:project_name]}/"
+          values[:url] = "https://ftpmirror.gnu.org/gnu/#{match[:project_name]}/"
 
           regex_name = Regexp.escape(T.must(match[:project_name])).gsub("\\-", "-")
 
diff --git a/Library/Homebrew/test/livecheck/strategy/gnu_spec.rb b/Library/Homebrew/test/livecheck/strategy/gnu_spec.rb
index 32c8037041..81c51f3d52 100644
--- a/Library/Homebrew/test/livecheck/strategy/gnu_spec.rb
+++ b/Library/Homebrew/test/livecheck/strategy/gnu_spec.rb
@@ -7,7 +7,7 @@ RSpec.describe Homebrew::Livecheck::Strategy::Gnu do
 
   let(:gnu_urls) do
     {
-      no_version_dir: "https://ftp.gnu.org/gnu/abc/abc-1.2.3.tar.gz",
+      no_version_dir: "https://ftpmirror.gnu.org/gnu/abc/abc-1.2.3.tar.gz",
       software_page:  "https://www.gnu.org/software/abc/",
       subdomain:      "https://abc.gnu.org",
       savannah:       "https://download.savannah.gnu.org/releases/abc/abc-1.2.3.tar.gz",
@@ -18,15 +18,15 @@ RSpec.describe Homebrew::Livecheck::Strategy::Gnu do
   let(:generated) do
     {
       no_version_dir: {
-        url:   "https://ftp.gnu.org/gnu/abc/",
+        url:   "https://ftpmirror.gnu.org/gnu/abc/",
         regex: %r{href=.*?abc[._-]v?(\d+(?:\.\d+)*)(?:\.[a-z]+|/)}i,
       },
       software_page:  {
-        url:   "https://ftp.gnu.org/gnu/abc/",
+        url:   "https://ftpmirror.gnu.org/gnu/abc/",
         regex: %r{href=.*?abc[._-]v?(\d+(?:\.\d+)*)(?:\.[a-z]+|/)}i,
       },
       subdomain:      {
-        url:   "https://ftp.gnu.org/gnu/abc/",
+        url:   "https://ftpmirror.gnu.org/gnu/abc/",
         regex: %r{href=.*?abc[._-]v?(\d+(?:\.\d+)*)(?:\.[a-z]+|/)}i,
       },
       savannah:       {},