diff --git a/BLE_BatteryLevel/mbed-os.lib b/BLE_BatteryLevel/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_BatteryLevel/mbed-os.lib
+++ b/BLE_BatteryLevel/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_Beacon/mbed-os.lib b/BLE_Beacon/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_Beacon/mbed-os.lib
+++ b/BLE_Beacon/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_Button/mbed-os.lib b/BLE_Button/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_Button/mbed-os.lib
+++ b/BLE_Button/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_EddystoneObserver/mbed-os.lib b/BLE_EddystoneObserver/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_EddystoneObserver/mbed-os.lib
+++ b/BLE_EddystoneObserver/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_EddystoneService/mbed-os.lib b/BLE_EddystoneService/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_EddystoneService/mbed-os.lib
+++ b/BLE_EddystoneService/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_GAPButton/mbed-os.lib b/BLE_GAPButton/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_GAPButton/mbed-os.lib
+++ b/BLE_GAPButton/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_HeartRate/mbed-os.lib b/BLE_HeartRate/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_HeartRate/mbed-os.lib
+++ b/BLE_HeartRate/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_LED/mbed-os.lib b/BLE_LED/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_LED/mbed-os.lib
+++ b/BLE_LED/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_LEDBlinker/mbed-os.lib b/BLE_LEDBlinker/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_LEDBlinker/mbed-os.lib
+++ b/BLE_LEDBlinker/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be
diff --git a/BLE_Thermometer/mbed-os.lib b/BLE_Thermometer/mbed-os.lib
index 12c22e4f8fd..873ba2c5333 100644
--- a/BLE_Thermometer/mbed-os.lib
+++ b/BLE_Thermometer/mbed-os.lib
@@ -1 +1 @@
-https://github.com/ARMmbed/mbed-os/#ed9d1da9dd0c43907ba40cba5ebd9f2c6da3dc07
+https://github.com/ARMmbed/mbed-os/#4c256f04596179699c4f14b6863b07cc024ca9be