diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20064c943..0d4bec08e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [0.4.0] - TBD
+## [0.4.0] - 2022-11-18
 
 ### Breaking Changes
 - Removed `golioth_settings_register_callback` function and redesigned the API.
@@ -13,6 +13,40 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   (e.g. `golioth_settings_register_int(client, "MY_SETTING", on_my_setting, NULL);`).
   The new APIs are demonstrated in the `golioth_basics` example code, which can be
   used as a guide for migrating existing code that uses the old APIs.
+- golioth_client: remove golioth_client_task_stack_min_remaining()
+### Added
+- Introduced a platform abstration layer (golioth_sys), to make porting easier
+- Linux port, for building SDK natively on Linux (or cross-compile for embedded Linux)
+- docs: new porting guide
+- Experimental "remote shell" feature, disabled by default
+- New API: lightdb_stream_set_cbor_async/sync
+- settings: support for reporting an array of settings errors to cloud
+- unit test framework
+- new git submodules: unity, fff, cJSON
+- golioth_log: add log level NONE, to disable logging entirely
+- golioth_log: GLTH_LOG_BUFFER_HEXDUMP macro
+- ci: run test_esp32s3.yml on a daily schedule
+- docs: Added Style_Guide.md
+### Changed
+- libcoap: upgrade submodule to 4.3.1
+- DTLS: better detection and logging of handshake failures
+- esp_idf: upgrade from v4.4.1 to v4.4.2
+- settings: removed name limit of 15 chars, now not limited
+- golioth_client: on stop(), block until client thread actually stopped
+- golioth_client: log "Golioth connected" when first connected
+- GLTH_LOGX macro now logs to Golioth cloud, if configured (enabled in examples)
+- golioth_basics: replace golioth_log* with GLTH_LOGX
+- ci: update to actions/checkout@v3 to avoid warnings
+- examples,modus_toolbox: require user to create credentials.inc with WiFi/Golioth creds.
+- ci: test against golioth.dev (dev server) instead golioth.io (prod server)
+- port:esp_idf,modus_toolbox: use golioth_sys abstraction layer
+- README: table of SDK features, by platform
+### Fixed
+- README: fix missing nvs_init in minimal example
+- Use inttypes.h for printf formatters (e.g. PRIu64), to avoid compiler warnings
+- coap_client: purge request queue on golioth_client_destroy()
+- port,mtb: override GLTH_LOGX to avoid 64-bit printf formwatters (not supported on MTB)
+- esp_idf,shell: better support for different serial configs, e.g. Adafruit ESP32-S3 USB JTAG
 
 ## [0.3.0] - 2022-10-04
 
diff --git a/README.md b/README.md
index b0e4436a3..14bbf58e8 100644
--- a/README.md
+++ b/README.md
@@ -136,6 +136,6 @@ The `verify.py` script will return 0 on success (all tests pass), and non-zero o
 | Board               | Platform             | Module           | Last Tested Commit    |
 | ---                 | ---                  | ---              | ---                   |
 | ESP32-S3-DevKitC-1  | ESP-IDF (v4.4.2)     | ESP32-S3-WROOM-1 | Every commit, CI/CD   |
-| ESP32-DevKitC-32E   | ESP-IDF (v4.4.1)     | ESP32-WROOM-32E  | v0.3.0 (Oct 4, 2022)  |
-| ESP32-C3-DevKitM-1  | ESP-IDF (v4.4.1)     | ESP32-C3-MINI-1  | v0.3.0 (Oct 4, 2022)  |
-| CY8CPROTO-062-4343W | ModusToolbox (3.0.0) | PSoC® 6 CYW4343W | v0.3.0 (Oct 17, 2022)  |
+| ESP32-DevKitC-32E   | ESP-IDF (v4.4.2)     | ESP32-WROOM-32E  | v0.4.0 (Nov 17, 2022)  |
+| ESP32-C3-DevKitM-1  | ESP-IDF (v4.4.2)     | ESP32-C3-MINI-1  | v0.4.0 (Nov 17, 2022)  |
+| CY8CPROTO-062-4343W | ModusToolbox (3.0.0) | PSoC® 6 CYW4343W | v0.4.0 (Nov 17, 2022)  |
diff --git a/VERSION.txt b/VERSION.txt
index 0d91a54c7..1d0ba9ea1 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-0.3.0
+0.4.0