diff --git a/core.lib b/core.lib
index 4d9802479f..cfcfcd5fd6 100644
--- a/core.lib
+++ b/core.lib
@@ -1 +1 @@
-https://github.com/mbedmicro/mbed/#42561b91931e793fe0151fbd3852c924fe394016
+https://github.com/mbedmicro/mbed/#b4bb088876cb72bda7006e423423aba4895d380c