diff --git a/NEWS.md b/NEWS.md
index e89b958518..75027be031 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -71,6 +71,7 @@ The following bundled gems are updated.
 
 * minitest 5.18.0
 * test-unit 3.6.0
+* net-imap 0.3.6
 * rbs 3.1.0
 * typeprof 0.21.7
 * debug 1.8.0
diff --git a/gems/bundled_gems b/gems/bundled_gems
index a985e6e3fb..8a954c5f44 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -12,7 +12,7 @@ test-unit       3.6.0   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        0.3.4   https://github.com/ruby/net-imap
+net-imap        0.3.6   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