diff --git a/NEWS.md b/NEWS.md
index adc0ac5daa..ea27493775 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -57,7 +57,7 @@ The following bundled gems are updated.
 * test-unit 3.6.2
 * net-ftp 0.3.4
 * net-imap 0.4.10
-* net-smtp 0.4.0.1
+* net-smtp 0.5.0
 * rbs 3.4.4
 * typeprof 0.21.11
 * debug 1.9.1
diff --git a/gems/bundled_gems b/gems/bundled_gems
index 00a49537de..5dfd755706 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -15,7 +15,7 @@ rss             0.3.0   https://github.com/ruby/rss
 net-ftp         0.3.4   https://github.com/ruby/net-ftp
 net-imap        0.4.10  https://github.com/ruby/net-imap
 net-pop         0.1.2   https://github.com/ruby/net-pop
-net-smtp        0.4.0.1 https://github.com/ruby/net-smtp
+net-smtp        0.5.0   https://github.com/ruby/net-smtp
 matrix          0.4.2   https://github.com/ruby/matrix
 prime           0.1.2   https://github.com/ruby/prime
 rbs             3.4.4   https://github.com/ruby/rbs ba7872795d5de04adb8ff500c0e6afdc81a041dd