diff --git a/drivers/include/drivers/BufferedSerial.h b/drivers/include/drivers/BufferedSerial.h
index 892ab47..0c492e1 100644
--- a/drivers/include/drivers/BufferedSerial.h
+++ b/drivers/include/drivers/BufferedSerial.h
@@ -61,7 +61,8 @@
      *  @param tx Transmit pin
      *  @param rx Receive pin
      *  @param baud The baud rate of the serial port (optional, defaults to
-     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
+     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE, which is set via
+     *              platform.default-serial-baud-rate in mbed_app.json)
      */
     BufferedSerial(
         PinName tx,
@@ -73,7 +74,8 @@
      *  receive pins, with a particular baud rate.
      *  @param static_pinmap reference to structure which holds static pinmap
      *  @param baud The baud rate of the serial port (optional, defaults to
-     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
+     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE, which is set via
+     *              platform.default-serial-baud-rate in mbed_app.json)
      */
     BufferedSerial(
         const serial_pinmap_t &static_pinmap,
diff --git a/drivers/include/drivers/SerialBase.h b/drivers/include/drivers/SerialBase.h
index 9288c27..71e94e3 100644
--- a/drivers/include/drivers/SerialBase.h
+++ b/drivers/include/drivers/SerialBase.h
@@ -48,7 +48,7 @@
 public:
     /** Set the baud rate of the serial port
      *
-     *  @param baudrate The baudrate of the serial port (default = 9600).
+     *  @param baudrate The baudrate of the serial port (default = platform.default-serial-baud-rate).
      */
     void baud(int baudrate);
 
diff --git a/drivers/include/drivers/UnbufferedSerial.h b/drivers/include/drivers/UnbufferedSerial.h
index a330d6e..de2054d 100644
--- a/drivers/include/drivers/UnbufferedSerial.h
+++ b/drivers/include/drivers/UnbufferedSerial.h
@@ -55,7 +55,8 @@
      *
      *  @param tx Transmit pin
      *  @param rx Receive pin
-     *  @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
+     *  @param baud The baud rate of the serial port (optional, defaults to MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE,
+     *              which is set via platform.default-serial-baud-rate in mbed_app.json)
      *
      *  @note
      *    Either tx or rx may be specified as NC if unused
@@ -70,7 +71,8 @@
      *  receive pins, with a particular baud rate.
      *  @param static_pinmap reference to structure which holds static pinmap
      *  @param baud The baud rate of the serial port (optional, defaults to
-     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE)
+     *              MBED_CONF_PLATFORM_DEFAULT_SERIAL_BAUD_RATE, which is set via
+     *              platform.default-serial-baud-rate in mbed_app.json)
      */
     UnbufferedSerial(
         const serial_pinmap_t &static_pinmap,
diff --git a/platform/mbed_lib.json b/platform/mbed_lib.json
index fce62ea..4f69cc3 100644
--- a/platform/mbed_lib.json
+++ b/platform/mbed_lib.json
@@ -23,7 +23,7 @@
 
         "stdio-baud-rate": {
             "help": "(Applies if target.console-uart is true.) Baud rate for stdio",
-            "value": 9600
+            "value": 115200
         },
 
         "stdio-flush-at-exit": {
@@ -33,7 +33,7 @@
 
         "default-serial-baud-rate": {
             "help": "Default baud rate for a serial object (if not specified in the constructor)",
-            "value": 9600
+            "value": 115200
         },
 
         "poll-use-lowpower-timer": {
@@ -170,15 +170,6 @@
         "STM": {
             "deepsleep-stats-verbose": false
         },
-        "EFM32": {
-            "stdio-baud-rate": 115200
-        },
-        "EFR32": {
-            "stdio-baud-rate": 115200
-        },
-        "UNO_91H": {
-            "stdio-baud-rate": 115200
-        },
         "DISCO_L475VG_IOT01A": {
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
@@ -219,12 +210,6 @@
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
         },
-        "NU_PFM_M2351": {
-            "stdio-baud-rate": 115200
-        },
-        "NU_M2354": {
-            "stdio-baud-rate": 115200
-        },
         "NRF52840_DK": {
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
@@ -245,27 +230,19 @@
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
         },
-        "S5JS100": {
-            "stdio-baud-rate": 115200
-        },
         "NUCLEO_L452RE-P": {
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
         },
         "ARM_MUSCA_B1": {
-            "stdio-convert-newlines": true,
-            "stdio-baud-rate": 115200
+            "stdio-convert-newlines": true
         },
         "ARM_MUSCA_S1": {
-            "stdio-convert-newlines": true,
-            "stdio-baud-rate": 115200
+            "stdio-convert-newlines": true
         },
         "MTS_DRAGONFLY_L471QG": {
             "crash-capture-enabled": true,
             "fatal-error-auto-reboot-enabled": true
-        },
-        "CY8CKIT064B0S2_4343W": {
-            "stdio-baud-rate": 115200
         }
     }
 }