diff --git a/ChangeLog b/ChangeLog
index bc31aa4427..78be5fc367 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Sep 26 12:00:12 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* gems/bundled_gems: update to minitest-5.9.1.
+
 Mon Sep 26 11:50:03 2016  Kazuki Yamaguchi  <k@rhe.jp>
 
 	* tool/rbinstall.rb (gem): Don't install gemspec if no files will be
diff --git a/gems/bundled_gems b/gems/bundled_gems
index fdbd9b7295..eba107724d 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -1,4 +1,5 @@
 did_you_mean 1.0.2
+minitest 5.9.1
 net-telnet 0.1.1
 power_assert 0.3.1
 rake 11.3.0