diff --git a/README.md b/README.md
index 8bf0014..6957242 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,14 @@ features planned for a future firmware version:
 release notes
 -------------
 
+### firmware [1.5](https://github.com/delan/usb3sun/releases/tag/1.5) (2023-07-18)
+
+* [pio_pkg_list.txt](https://github.com/delan/usb3sun/blob/1.5/pio_pkg_list.txt) = dependency tree at time of release
+* added a **macro to reprogram your idprom** — this makes it easier to boot your workstation with a dead nvram battery
+* added a **macro to wipe your idprom** — this makes your idprom contents invalid, as if you had a dead nvram battery
+* added a **hostid setting** — this sets the hostid used when reprogramming your idprom
+* changed behaviour of builtin led to turn on at the very start of setup — this may help troubleshoot problems with CDC serial port initialisation
+
 ### firmware [1.4](https://github.com/delan/usb3sun/releases/tag/1.4) (2023-07-17)
 
 * [pio_pkg_list.txt](https://github.com/delan/usb3sun/blob/1.4/pio_pkg_list.txt) = dependency tree at time of release
diff --git a/platformio.ini b/platformio.ini
index fe44585..b1a75c0 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -20,7 +20,7 @@ lib_deps =
     https://github.com/adafruit/Adafruit_SSD1306.git#2.5.7
     https://github.com/adafruit/Adafruit_TinyUSB_Arduino.git#2.0.1
     https://github.com/sekigon-gonnoc/Pico-PIO-USB.git#0.5.2
-build_flags = -DUSB3SUN_VERSION=\"1.4\" -DUSE_TINYUSB -DCFG_TUSB_CONFIG_FILE=\"C:/Users/delan/code/usb3sun/tusb_config.h\" ; -DCFG_TUSB_DEBUG=3
+build_flags = -DUSB3SUN_VERSION=\"1.5\" -DUSE_TINYUSB -DCFG_TUSB_CONFIG_FILE=\"C:/Users/delan/code/usb3sun/tusb_config.h\" ; -DCFG_TUSB_DEBUG=3
 board_build.f_cpu = 120000000L
 board_build.filesystem_size = 64k
 ; build_type = debug