diff --git a/NEWS.md b/NEWS.md
index 397012914c..598be714e5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -62,8 +62,8 @@ The following default gems are updated.
 * optparse 0.7.0.dev.2
 * prism 1.4.0
 * psych 5.2.3
-* stringio 3.1.8
-* strscan 3.1.3
+* stringio 3.1.8.dev
+* strscan 3.1.4.dev
 * uri 1.0.3
 
 The following bundled gems are added.