diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 1c861e15a..8efb275a8 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"0.3.0"}
+{".":"0.4.0"}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9e6c9ade7..42db00dd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,40 @@
 # Changelog
 
+## [0.4.0](https://github.com/zmkfirmware/zmk/compare/v0.3.0...v0.4.0) (2025-12-04)
+
+
+### ⚠ BREAKING CHANGES
+
+* **core:** Allow layer behaviors to "lock" layers on (https://github.com/zmkfirmware/zmk/pull/2717)
+
+### Features
+
+* Allow layer behaviors to "lock" layers on (https://github.com/zmkfirmware/zmk/pull/2717) ([5138c6f](https://github.com/zmkfirmware/zmk/commit/5138c6fb14783b756c5a3e61581625c700f3555b))
+* **ble:** Use appearance set in the BT_DEVICE_APPEARANCE config ([#3115](https://github.com/zmkfirmware/zmk/issues/3115)) ([ad7fbfe](https://github.com/zmkfirmware/zmk/commit/ad7fbfef920d9907ca8f143e273fa9eb7d84b25a))
+* **boards/shields:** Add settings for Rpi Pico and add tester_rpi_pico shield ([#2900](https://github.com/zmkfirmware/zmk/issues/2900)) ([ccf20a1](https://github.com/zmkfirmware/zmk/commit/ccf20a1f5c1534a197d32279abbe0eaf651099d8))
+* **boards:** add support for nrf52840dongle_nrf52840 ([#3011](https://github.com/zmkfirmware/zmk/issues/3011)) ([c7fae18](https://github.com/zmkfirmware/zmk/commit/c7fae18ae122b2465080507380dd55d096edd666))
+* **docs:** Update New Behavior Guide ([#3107](https://github.com/zmkfirmware/zmk/issues/3107)) ([e34793e](https://github.com/zmkfirmware/zmk/commit/e34793e8c7193bc868b95ec38d78f67956f759cb))
+* **layouts:** Add physical layout for Redox shield ([61de01a](https://github.com/zmkfirmware/zmk/commit/61de01abb00a73349a188ef2e10ad1cd040d31b3))
+* **split:** Add HID indicators and physical layout set to Wired split ([#3103](https://github.com/zmkfirmware/zmk/issues/3103)) ([7738924](https://github.com/zmkfirmware/zmk/commit/773892434931b74bdf54474b73c909779daa9471))
+
+
+### Bug Fixes
+
+* **ci:** disable nrf5340dk from being built in our CI ([#3066](https://github.com/zmkfirmware/zmk/issues/3066)) ([522971f](https://github.com/zmkfirmware/zmk/commit/522971f41d62d7e5d6664eb61c84d190781feeb9))
+* **ci:** Fix release please template bump ([#3021](https://github.com/zmkfirmware/zmk/issues/3021)) ([f3233c1](https://github.com/zmkfirmware/zmk/commit/f3233c1b60e4cb4c095572740bcbcaf7111eb804))
+* **core:** Generate correct keymap layer names for all builds ([#3047](https://github.com/zmkfirmware/zmk/issues/3047)) ([0b5a103](https://github.com/zmkfirmware/zmk/commit/0b5a103c187ad337b9f50d824667866c4d7252e1)), closes [#3045](https://github.com/zmkfirmware/zmk/issues/3045)
+* **docs:** Tweak layer tap example to be clearer ([#3023](https://github.com/zmkfirmware/zmk/issues/3023)) ([919bce7](https://github.com/zmkfirmware/zmk/commit/919bce7962db78139415ccf0e80fb858c89adb3d))
+
+
+### Documentation
+
+* Added documentation note on locking layers ([5138c6f](https://github.com/zmkfirmware/zmk/commit/5138c6fb14783b756c5a3e61581625c700f3555b))
+
+
+### Code Refactoring
+
+* **core:** Allow layer behaviors to "lock" layers on (https://github.com/zmkfirmware/zmk/pull/2717) ([5138c6f](https://github.com/zmkfirmware/zmk/commit/5138c6fb14783b756c5a3e61581625c700f3555b))
+
 ## [0.3.0](https://github.com/zmkfirmware/zmk/compare/v0.2.1...v0.3.0) (2025-08-01)
 
 
diff --git a/app/VERSION b/app/VERSION
index 07a7f21fc..a8d096c43 100644
--- a/app/VERSION
+++ b/app/VERSION
@@ -3,7 +3,7 @@ VERSION_MAJOR = 0
 # x-release-please-end
 
 # x-release-please-start-minor
-VERSION_MINOR = 3
+VERSION_MINOR = 4
 # x-release-please-end
 
 # x-release-please-start-patch