diff --git a/NEWS.md b/NEWS.md
index b15ce96a9e..ec80fcb53b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -167,6 +167,7 @@ The following default gems are updated.
 * weakref 0.1.3
 * win32ole 1.8.10
 * yaml 0.3.0
+* zlib 3.1.0
 
 The following bundled gem is promoted from default gems.