diff --git a/stm32/MK4-Makefile b/stm32/MK4-Makefile
index 7334f3a2..65970136 100644
--- a/stm32/MK4-Makefile
+++ b/stm32/MK4-Makefile
@@ -12,7 +12,7 @@ BOOTLOADER_BASE = 0x08000000
 MK_NUM = 4
 
 # This is release of the bootloader that will be built into the release firmware.
-BOOTLOADER_VERSION = 3.1.3
+BOOTLOADER_VERSION = 3.1.4
 BOOTLOADER_DIR = mk4-bootloader
 
 LATEST_RELEASE = $(shell ls -t1 ../releases/*-mk4-*.dfu | head -1)