diff --git a/targets/mbedos5/mbed-os.lib b/targets/mbedos5/mbed-os.lib
index 38ad35227..efedfa803 100644
--- a/targets/mbedos5/mbed-os.lib
+++ b/targets/mbedos5/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#c966348d3f9ca80843be7cdc9b748f06ea73ced0
+https://github.com/ARMmbed/mbed-os/#51d55508e8400b60af467005646c4e2164738d48