diff --git a/NEWS.md b/NEWS.md
index acf4f4d396..79a5363dab 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -81,9 +81,9 @@ The following default gems are updated.
 
 The following bundled gems are updated.
 
-* minitest 5.18.1
+* minitest 5.19.0
 * test-unit 3.6.1
-* net-imap 0.3.6
+* net-imap 0.3.7
 * rbs 3.1.1
 * typeprof 0.21.7
 * debug 1.8.0
diff --git a/gems/bundled_gems b/gems/bundled_gems
index 11e23fd227..3077e50172 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -5,14 +5,14 @@
 # - 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        5.18.1  https://github.com/minitest/minitest
+minitest        5.19.0  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       3.6.1   https://github.com/test-unit/test-unit
 rexml           3.2.5   https://github.com/ruby/rexml
 rss             0.2.9   https://github.com/ruby/rss
 net-ftp         0.2.0   https://github.com/ruby/net-ftp
-net-imap        0.3.6   https://github.com/ruby/net-imap
+net-imap        0.3.7   https://github.com/ruby/net-imap
 net-pop         0.1.2   https://github.com/ruby/net-pop
 net-smtp        0.3.3   https://github.com/ruby/net-smtp
 matrix          0.4.2   https://github.com/ruby/matrix