diff --git a/CHANGELOG.md b/CHANGELOG.md
index d48a766..b4a9d93 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,16 @@ All notable changes to this project will be documented in this file.
 The format is loosely based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to the [UHK Versioning](VERSIONING.md) conventions.
 
+## [8.4.0] - 2018-07-24
+
+Device Protocol: 4.**4.0** | Module Protocol: 4.0.0 | User Config: 4.1.0 | Hardware Config: 1.0.0
+
+- Rewrite the key debouncer and set the press and release timeouts to 50ms.
+- Add hardcoded test keymap.
+- Make debounce timeouts configurable via USB. `DEVICEPROTOCOL:MINOR`
+- Make the hardcoded test keymap able to trigger via USB. `DEVICEPROTOCOL:MINOR`
+- Allow the USB stack test mode to be activated via USB. `DEVICEPROTOCOL:MINOR`
+
 ## [8.3.3] - 2018-07-03
 
 Device Protocol: 4.3.1 | Module Protocol: 4.0.0 | User Config: 4.1.0 | Hardware Config: 1.0.0
diff --git a/lib/agent b/lib/agent
index 15df8d7..ac89aff 160000
--- a/lib/agent
+++ b/lib/agent
@@ -1 +1 @@
-Subproject commit 15df8d71299e0547d953874d1a8d21e9147a396f
+Subproject commit ac89aff0186dea17d16fc38292a35190d682584b
diff --git a/scripts/package.json b/scripts/package.json
index 7b54830..dc9d720 100644
--- a/scripts/package.json
+++ b/scripts/package.json
@@ -15,8 +15,8 @@
     "commander": "^2.11.0",
     "shelljs": "^0.7.8"
   },
-  "firmwareVersion": "8.3.3",
-  "deviceProtocolVersion": "4.3.1",
+  "firmwareVersion": "8.4.0",
+  "deviceProtocolVersion": "4.4.0",
   "moduleProtocolVersion": "4.0.0",
   "userConfigVersion": "4.1.0",
   "hardwareConfigVersion": "1.0.0",
diff --git a/shared/versions.h b/shared/versions.h
index 72a3e39..c6ce90b 100644
--- a/shared/versions.h
+++ b/shared/versions.h
@@ -19,12 +19,12 @@
 // Variables:
 
     #define FIRMWARE_MAJOR_VERSION 8
-    #define FIRMWARE_MINOR_VERSION 3
-    #define FIRMWARE_PATCH_VERSION 3
+    #define FIRMWARE_MINOR_VERSION 4
+    #define FIRMWARE_PATCH_VERSION 0
 
     #define DEVICE_PROTOCOL_MAJOR_VERSION 4
-    #define DEVICE_PROTOCOL_MINOR_VERSION 3
-    #define DEVICE_PROTOCOL_PATCH_VERSION 1
+    #define DEVICE_PROTOCOL_MINOR_VERSION 4
+    #define DEVICE_PROTOCOL_PATCH_VERSION 0
 
     #define MODULE_PROTOCOL_MAJOR_VERSION 4
     #define MODULE_PROTOCOL_MINOR_VERSION 0