diff --git a/core.lib b/core.lib
index 1029889dc0..4d9802479f 100644
--- a/core.lib
+++ b/core.lib
@@ -1 +1 @@
-https://github.com/mbedmicro/mbed/#d0db5c94e5ce899412280d8c71d65850e0c8b30b
+https://github.com/mbedmicro/mbed/#42561b91931e793fe0151fbd3852c924fe394016