diff --git a/NEWS.md b/NEWS.md
index 50e9cd8ebe2c5f..570f16a7053d36 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -69,7 +69,7 @@ The following default gems are updated.
 
 The following bundled gems are updated.
 
-* minitest 5.18.0
+* minitest 5.18.1
 * test-unit 3.6.0
 * net-imap 0.3.6
 * rbs 3.1.0
diff --git a/gems/bundled_gems b/gems/bundled_gems
index 62d6b8346bcb43..a319905f5fe59e 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -5,7 +5,7 @@
 # - repository-url: URL from where clone for test
 # - revision: revision in repository-url to test
 #   if `revision` is not given, "v"+`version` or `version` will be used.
-minitest        5.18.0  https://github.com/minitest/minitest
+minitest        5.18.1  https://github.com/minitest/minitest
 power_assert    2.0.3   https://github.com/ruby/power_assert
 rake            13.0.6  https://github.com/ruby/rake
 test-unit       3.6.0   https://github.com/test-unit/test-unit