diff --git a/tools/update-pgroonga-upgrade-page.sh b/tools/update-pgroonga-upgrade-page.sh
new file mode 100755
index 000000000..fbe67748e
--- /dev/null
+++ b/tools/update-pgroonga-upgrade-page.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+set -eu
+
+if [ $# -ne 1 ] && [ $# -ne 2 ]; then
+  echo "USAGE: ./update-pgroonga-upgrade-page.sh compatible"
+  echo "or"
+  echo "USAGE: ./update-pgroonga-upgrade-page.sh incompatible \"a reason of incompatible\""
+  exit 1
+fi
+
+COMPATIBLE_OR_NOT=$1
+
+git clone git@github.com:pgroonga/pgroonga.git
+pushd pgroonga
+LATEST_VERSION=$(git tag --sort version:refname | tail -n 2 | sed -n '2p')
+PREVIOUS_VERSION=$(git tag --sort version:refname | tail -n 2 | sed -n '1p')
+popd
+rm -rf pgroonga
+
+cd ../
+
+if [ $COMPATIBLE_OR_NOT = "compatible" ]; then
+  cat <<CONTENTS | sed -ie "/^Here is a list of compatibility/r /dev/stdin" upgrade/index.md
+
+  * $PREVIOUS_VERSION -> $LATEST_VERSION: o
+CONTENTS
+else
+  set +u
+  INCOMPATIBLE_REASON=$2
+  set -u
+  cat <<CONTENTS | sed -ie "/^Here is a list of compatibility/r /dev/stdin" upgrade/index.md
+
+  * $PREVIOUS_VERSION -> $LATEST_VERSION: x
+
+    * $INCOMPATIBLE_REASON
+CONTENTS
+fi
+
+# TODO: I'll remove translation.
+# Because contents of this page doesn't need to translate.
+rake jekyll:i18n:translate
+git add _po/ja/upgrade/index.po
+git add ja/upgrade/index.md
+git add upgrade/index.md
+
+git commit -m "upgrade: add $PREVIOUS_VERSION -> $LATEST_VERSION"
+#git push