diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91a1dc37ac..e0693441a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,44 @@
 
 - Protected mode [#2734](https://github.com/particle-iot/device-os/pull/2734)
 
+## 5.9.0
+
+### FEATURES
+- Supports M.2 breakout board and Muon [#2809](https://github.com/particle-iot/device-os/pull/2809)
+
+
+### ENHANCEMENTS
+- [Gen 4] Adds detailed WiFi access point disconnect reason logging [#2805](https://github.com/particle-iot/device-os/pull/2805)
+- [ACM] Perform cloud ping or reachability test on network events; non-blocking background reachability test [#2811](https://github.com/particle-iot/device-os/pull/2811)
+- [Gen 3] BLE: increase a number of retries for service discovery in central role [#2801](https://github.com/particle-iot/device-os/pull/2801)
+- [Gen 3] BLE: suspend scanning while in connected state and restore scanning after a disconnect (SoftDevice limitation) [#2801](https://github.com/particle-iot/device-os/pull/2801)
+- [cellular][r510] unmask bands for global use [#2803](https://github.com/particle-iot/device-os/pull/2803)
+- BLE: streamlines `BLE.scan()` behavior to be blocking irrespective of timeout, but allows other BLE operations to be performed [#2796](https://github.com/particle-iot/device-os/pull/2796)
+- BLE: streamlines `BLE.stopScanning()` behavior to be blocking when not called from BLE callback and guarantees scanning to be stopped on return [#2796](https://github.com/particle-iot/device-os/pull/2796)
+- [Gen 4] BLE: improves locking in a number of BLE API calls [#2813](https://github.com/particle-iot/device-os/pull/2813)
+
+### BUGFIXES
+- [Gen 3] BLE: fixes a race condition in connected state reporting in central and peripheral roles [#2801](https://github.com/particle-iot/device-os/pull/2801)
+- [Gen 4] i2c: use transactions for fuelgauge and pmic on platforms with single i2c bus to avoid cutting into compound application I2C transmissions [#2822](https://github.com/particle-iot/device-os/pull/2822)
+- Reduce latency of the system loop [#2797](https://github.com/particle-iot/device-os/pull/2797)
+- Work around a bug in lfs_remove() while recursive traversing directories [#2798](https://github.com/particle-iot/device-os/pull/2798)
+- [Gen 4] set sleep timer upper bounds [#2810](https://github.com/particle-iot/device-os/pull/2810)
+- [Gen 4] Fixes potential deadlock in WiFi and BLE stacks [#2805](https://github.com/particle-iot/device-os/pull/2805)
+- [Gen 4] fixes DMA enabled USART flush [#2800](https://github.com/particle-iot/device-os/pull/2800)
+- [Gen 4] Fixes `BLE.stopScanning()` deadlock when called from inside BLE callback [#2796](https://github.com/particle-iot/device-os/pull/2796)
+- [Gen 4] i2c: clear I2C tx buffer before each transmission [#2819](https://github.com/particle-iot/device-os/pull/2819)
+- fixes `USART::available()` after waking from sleep [#2816](https://github.com/particle-iot/device-os/pull/2816)
+- [Gen 4] fixes BLE race condition while scanning [#2818](https://github.com/particle-iot/device-os/pull/2818)
+- [Gen 4] usb: fix an issue with USB re-attach after sleep [#2824](https://github.com/particle-iot/device-os/pull/2824) [#2823](https://github.com/particle-iot/device-os/pull/2823)
+- [Gen 4] prebootloader: fix STOP/ULP sleep with disabled KM0 RTOS, get correct wake-up reason [#2825](https://github.com/particle-iot/device-os/pull/2825)
+- Fixes I2C hal issues [#2826](https://github.com/particle-iot/device-os/pull/2826)
+
+### INTERNAL
+- Add serial loopback to test runner [#2816](https://github.com/particle-iot/device-os/pull/2816)
+- [tests] Support integration tests on gen4 after device-constants update [#2814](https://github.com/particle-iot/device-os/pull/2814)
+- Adds fixture tests [#2823](https://github.com/particle-iot/device-os/pull/2823)
+- [tests] ACM prefer feature, adjust logging [#2795](https://github.com/particle-iot/device-os/pull/2795)
+
 ## 5.8.2
 
 ### FEATURES
diff --git a/build/release.sh b/build/release.sh
index ba2c8e51a4..6d7477cc55 100755
--- a/build/release.sh
+++ b/build/release.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 set -o errexit -o pipefail -o noclobber -o nounset
 
-VERSION=${VERSION:="5.8.2"}
+VERSION=${VERSION:="5.9.0"}
 
 function display_help ()
 {
diff --git a/build/version.mk b/build/version.mk
index 2bad84cfc3..351ec56d63 100755
--- a/build/version.mk
+++ b/build/version.mk
@@ -1,7 +1,7 @@
-VERSION_STRING = 5.8.2
+VERSION_STRING = 5.9.0
 
 # PRODUCT_FIRMWARE_VERSION reported by default
 # FIXME: Unclear if this is used, PRODUCT_FIRMWARE_VERSION defaults to 65535 every release
-VERSION = 5802
+VERSION = 5901
 
 CFLAGS += -DSYSTEM_VERSION_STRING=$(VERSION_STRING)
diff --git a/modules/shared/system_module_version.mk b/modules/shared/system_module_version.mk
index 9c042d9ec0..fc1bb2921f 100644
--- a/modules/shared/system_module_version.mk
+++ b/modules/shared/system_module_version.mk
@@ -1,6 +1,6 @@
 # Skip to next 100 every v0.x.0 release (e.g. 108 for v0.6.2 to 200 for v0.7.0-rc.1)
 # Bump by 1 for every prerelease or release with the same v0.x.* base.
-COMMON_MODULE_VERSION ?= 5802
+COMMON_MODULE_VERSION ?= 5901
 SYSTEM_PART1_MODULE_VERSION ?= $(COMMON_MODULE_VERSION)
 
 RELEASE_080_MODULE_VERSION_BASE ?= 300
@@ -14,11 +14,11 @@ USER_PART_MODULE_VERSION ?= 6
 # Skip to next 100 every v0.x.0 release (e.g. 11 for v0.6.2 to 100 for v0.7.0-rc.1),
 # but only if the bootloader has changed since the last v0.x.0 release.
 # Bump by 1 for every updated bootloader image for a release with the same v0.x.* base.
-BOOTLOADER_VERSION ?= 2601
+BOOTLOADER_VERSION ?= 2700
 
 ifeq ($(PLATFORM_MCU),rtl872x)
 PREBOOTLOADER_MBR_VERSION ?= 2
-PREBOOTLOADER_PART1_VERSION ?= 8
+PREBOOTLOADER_PART1_VERSION ?= 9
 endif
 
 # The version of the bootloader that the system firmware requires
@@ -26,7 +26,7 @@ endif
 # this version usually lags behind the current bootloader version, to avoid non-mandatory updates.
 ifeq ($(PLATFORM_GEN),3)
 ifeq ($(PLATFORM_MCU),rtl872x)
-BOOTLOADER_DEPENDENCY = 2601
+BOOTLOADER_DEPENDENCY = 2700
 else # ifeq ($(PLATFORM_MCU),rtl872x)
 BOOTLOADER_DEPENDENCY = 2300
 endif # ifeq ($(PLATFORM_GEN),3)
@@ -36,7 +36,7 @@ BOOTLOADER_DEPENDENCY = 0
 endif
 
 ifeq ($(PLATFORM_MCU),rtl872x)
-PREBOOTLOADER_PART1_DEPENDENCY = 8
+PREBOOTLOADER_PART1_DEPENDENCY = 9
 endif
 
 ifeq ($(PLATFORM_GEN),3)
diff --git a/system/inc/system_version.h b/system/inc/system_version.h
index 8d594d7651..f88e711265 100644
--- a/system/inc/system_version.h
+++ b/system/inc/system_version.h
@@ -217,7 +217,8 @@ extern "C" {
 #define SYSTEM_VERSION_v580         SYSTEM_VERSION_DEFAULT(5, 8, 0)
 #define SYSTEM_VERSION_v581         SYSTEM_VERSION_DEFAULT(5, 8, 1)
 #define SYSTEM_VERSION_v582         SYSTEM_VERSION_DEFAULT(5, 8, 2)
-#define SYSTEM_VERSION SYSTEM_VERSION_v582
+#define SYSTEM_VERSION_v590         SYSTEM_VERSION_DEFAULT(5, 9, 0)
+#define SYSTEM_VERSION SYSTEM_VERSION_v590
 
 /**
  * Previously we would set the least significant byte to 0 for the final release, but to make
@@ -399,6 +400,7 @@ extern "C" {
 #define SYSTEM_VERSION_580
 #define SYSTEM_VERSION_581
 #define SYSTEM_VERSION_582
+#define SYSTEM_VERSION_590
 
 typedef struct __attribute__((packed)) SystemVersionInfo
 {
diff --git a/system/system-versions.md b/system/system-versions.md
index 26f3c435ba..c971780fcc 100644
--- a/system/system-versions.md
+++ b/system/system-versions.md
@@ -192,6 +192,7 @@
 | 2600 | 5800 | 5.8.0         |      Argon, Boron, B SoM, B5 SoM, Tracker, Tracker M, E Som X, M SoM, P2 |
 | 2600 | 5801 | 5.8.1         |      Argon, Boron, B SoM, B5 SoM, Tracker, Tracker M, E Som X, M SoM, P2 |
 | 2601 | 5802 | 5.8.2         |      Argon, Boron, B SoM, B5 SoM, Tracker, Tracker M, E Som X, M SoM, P2 |
+| 2700 | 5901 | 5.9.0         |      Argon, Boron, B SoM, B5 SoM, Tracker, Tracker M, E Som X, M SoM, P2 |
 | 3000 | 6000 | 6.0.0         |      Argon, Boron, B SoM, B5 SoM, Tracker, Tracker M, E Som X, M SoM, P2 |
 
 [1] For 0.8.0-rc.1, The v101 bootloader was also released in the Github releases as v200. Thus the next released bootloader in the 0.8.x line should be v201. As of 4/5/2018: 22 device had v200 bootloaders.