diff --git a/lib/mruby b/lib/mruby
index dd483b9..959a54e 160000
--- a/lib/mruby
+++ b/lib/mruby
@@ -1 +1 @@
-Subproject commit dd483b90b3f88a0684337b883d6de0c1c6df6344
+Subproject commit 959a54e666979d74f41a92e3837e84b11cb5a425