diff --git a/gems/bundled_gems b/gems/bundled_gems
index a685ec74cc..9c1f6eb2b1 100644
--- a/gems/bundled_gems
+++ b/gems/bundled_gems
@@ -13,4 +13,4 @@ matrix 0.4.2 https://github.com/ruby/matrix
 prime 0.1.2 https://github.com/ruby/prime
 rbs 1.8.1 https://github.com/ruby/rbs
 typeprof 0.20.4 https://github.com/ruby/typeprof
-debug 1.3.4 https://github.com/ruby/debug 1e1bc8262fcbd33199114b7573151c7754a3e505
+debug 1.4.0 https://github.com/ruby/debug