diff --git a/.travis.yml b/.travis.yml
index 9b08d74..fc82b14 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,12 +17,7 @@ install:
 - sphinx-build -j4 -D language=ja -D locale_dirs=locale -D gettext_compact=0 -A versionswitcher=1 -E -d build/doctrees . ../../py27
 script:
 - cd ../../py27
-- git config user.email "travis-build-bot@example.com"
-- git config user.name "Autobuild bot on Travis-CI"
-- git pull origin master
-- git add .
-- if [ $(git status -s | wc -l) -eq 0 ]; then echo "nothing to commit"; exit 0; fi
-- git commit -a -m "update html"
+- ../py27-locale/update_github_pages.sh
 - git push --quiet "https://${GH_TOKEN}@github.com/python-doc-ja/py27.git" master:master
 
 env:
diff --git a/update_github_pages.sh b/update_github_pages.sh
new file mode 100755
index 0000000..09eb08c
--- /dev/null
+++ b/update_github_pages.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+set -Ceux
+
+git config user.email "travis-build-bot@example.com"
+git config user.name "Autobuild bot on Travis-CI"
+git config --local core.quotepath false
+git pull origin master
+if [ $(git status -s | wc -l) -eq 0 ]; then
+    echo "nothing to commit"
+    exit 0
+elif [ $(git --no-pager diff -G"最終更新日時: " | wc -l) -eq 0 ]; then
+    git add .
+else
+    files_to_add=$(git --no-pager diff --numstat | awk '! ($1 == 1 && $2 == 1 && $3 ~ /.html$/) { print $3 }')
+    if [ -z "${files_to_add}" ]; then
+        echo "nothing to commit except for lines of '最終更新日時: '"
+        exit 0
+    else
+        git add ${files_to_add}
+    fi
+fi
+git commit -m "update html"