diff --git a/tools/update-pgroonga-upgrade-page.rb b/tools/update-pgroonga-upgrade-page.rb
new file mode 100644
index 000000000..e97604036
--- /dev/null
+++ b/tools/update-pgroonga-upgrade-page.rb
@@ -0,0 +1,45 @@
+#!/usr/bin/env ruby
+
+unless ARGV.length == 1 || ARGV.length == 2
+  puts "USAGE: ./update-pgroonga-upgrade-page.rb compatible"
+  puts "or"
+  puts "USAGE: ./update-pgroonga-upgrade-page.rb incompatible \"a reason of incompatible\""
+  exit 1
+end
+
+COMPATIBLE_OR_NOT = ARGV[0]
+
+system("git clone git@github.com:pgroonga/pgroonga.git")
+Dir.chdir("pgroonga") do
+  latest_version = `git tag --sort version:refname | tail -n 2 | sed -n '2p'`.strip
+  previous_version = `git tag --sort version:refname | tail -n 2 | sed -n '1p'`.strip
+end
+system("rm -rf pgroonga")
+
+Dir.chdir("../")
+
+if COMPATIBLE_OR_NOT == "compatible"
+  contents = <<-CONTENTS
+    * #{previous_version} -> #{latest_version}: o
+  CONTENTS
+
+  `sed -ie "/^Here is a list of compatibility/r /dev/stdin" upgrade/index.md`, stdin_data: contents
+else
+  INCOMPATIBLE_REASON = ARGV[1]
+  contents = <<-CONTENTS
+    * #{previous_version} -> #{latest_version}: x
+      * #{INCOMPATIBLE_REASON}
+  CONTENTS
+
+  `sed -ie "/^Here is a list of compatibility/r /dev/stdin" upgrade/index.md`, stdin_data: contents
+end
+
+# TODO: I'll remove translation.
+# Because contents of this page doesn't need to translate.
+system("rake jekyll:i18n:translate")
+system("git add _po/ja/upgrade/index.po")
+system("git add ja/upgrade/index.md")
+system("git add upgrade/index.md")
+
+system("git commit -m \"upgrade: add #{previous_version} -> #{latest_version}\"")
+# system("git push")