diff --git a/ChangeLog b/ChangeLog
index 80dce3b996..48a0f3fd7f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 25 09:48:27 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
+
+	* gems/bundled_gems: upgrade to minitest-5.8.1
+
 Fri Sep 25 09:47:12 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* id_table.c: fix typo. [ci skip][fix GH-1031] Patch @davydovanton
diff --git a/gems/bundled_gems b/gems/bundled_gems
index feb3201dd1..5ef8f4021a 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -1,6 +1,6 @@
 power_assert 0.2.4
 test-unit 3.1.3
-minitest 5.8.0
+minitest 5.8.1
 rake 10.4.2
 net-telnet 0.1.1
 did_you_mean 1.0.0.beta2