diff --git a/NEWS.md b/NEWS.md
index c83878314b..9c12f87048 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -255,7 +255,7 @@ The following bundled gems are updated.
 * net-smtp 0.4.0
 * rbs 3.4.0
 * typeprof 0.21.9
-* debug 1.9.0
+* debug 1.9.1
 
 See GitHub releases like [Logger](https://github.com/ruby/logger/releases) or
 changelog for details of the default gems or bundled gems.
diff --git a/gems/bundled_gems b/gems/bundled_gems
index 185ac9d28c..462b701d46 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -19,5 +19,5 @@ matrix          0.4.2   https://github.com/ruby/matrix
 prime           0.1.2   https://github.com/ruby/prime
 rbs             3.4.0   https://github.com/ruby/rbs
 typeprof        0.21.9  https://github.com/ruby/typeprof
-debug           1.9.0   https://github.com/ruby/debug d4feeae32b69b4f88c94fecfc7a283b475eec4de
+debug           1.9.1   https://github.com/ruby/debug
 racc            1.7.3   https://github.com/ruby/racc