diff --git a/NEWS.md b/NEWS.md
index e0d09ee928..04b8a2cdde 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -47,7 +47,7 @@ The following default gems are updated.
 * json 2.10.1
 * prism 1.3.0
 * psych 5.2.3
-* stringio 3.1.3.dev
+* stringio 3.1.6.dev
 
 The following bundled gems are added.