diff --git a/CHANGELOG.md b/CHANGELOG.md
index e5d148a59753e1..3a7decc07a20a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,91 @@
 
 # Node.js ChangeLog
 
+## 2015-10-07, Version 4.2.0 'Argon' (Stable), @jasnell
+
+### Notable changes
+
+The first Node.js LTS release! See https://github.com/nodejs/LTS/ for details of the LTS process.
+
+* **icu**: Updated to version 56 with significant performance improvements (Steven R. Loomis) [#3281](https://github.com/nodejs/node/pull/3281)
+* **node**:
+  - Added new `-c` (or `--check`) command line argument for checking script syntax without executing the code (Dave Eddy) [#2411](https://github.com/nodejs/node/pull/2411)
+  - Added `process.versions.icu` to hold the current ICU library version (Evan Lucas) [#3102](https://github.com/nodejs/node/pull/3102)
+  - Added `process.release.lts` to hold the current LTS codename when the binary is from an active LTS release line (Rod Vagg) [#3212](https://github.com/nodejs/node/pull/3212)
+* **npm**: Upgraded to npm 2.14.7 from 2.14.4, see [release notes](https://github.com/npm/npm/releases/tag/v2.14.7) for full details (Kat Marchán) [#3299](https://github.com/nodejs/node/pull/3299)
+
+### Known issues
+
+See https://github.com/nodejs/node/labels/confirmed-bug for complete and current list of known issues.
+
+* Some problems with unreferenced timers running during `beforeExit` are still to be resolved. See [#1264](https://github.com/nodejs/node/issues/1264).
+* Surrogate pair in REPL can freeze terminal. [#690](https://github.com/nodejs/node/issues/690)
+* Calling `dns.setServers()` while a DNS query is in progress can cause the process to crash on a failed assertion. [#894](https://github.com/nodejs/node/issues/894)
+* `url.resolve` may transfer the auth portion of the url when resolving between two full hosts, see [#1435](https://github.com/nodejs/node/issues/1435).
+
+### Commits
+
+
+* [[`8383c4fe00`](https://github.com/nodejs/node/commit/8383c4fe00)] - **assert**: support arrow functions in .throws() (Ben Noordhuis) [#3276](https://github.com/nodejs/node/pull/3276)
+* [[`3eaa593a32`](https://github.com/nodejs/node/commit/3eaa593a32)] - **async_wrap**: correctly pass parent to init callback (Trevor Norris) [#3216](https://github.com/nodejs/node/pull/3216)
+* [[`54795620f6`](https://github.com/nodejs/node/commit/54795620f6)] - **buffer**: don't abort on prototype getters (Trevor Norris) [#3302](https://github.com/nodejs/node/pull/3302)
+* [[`660f7591c8`](https://github.com/nodejs/node/commit/660f7591c8)] - **buffer**: FreeCallback should be tied to ArrayBuffer (Fedor Indutny) [#3198](https://github.com/nodejs/node/pull/3198)
+* [[`651a5b51eb`](https://github.com/nodejs/node/commit/651a5b51eb)] - **buffer**: only check if instance is Uint8Array (Trevor Norris) [#3080](https://github.com/nodejs/node/pull/3080)
+* [[`d5a1b1ad7c`](https://github.com/nodejs/node/commit/d5a1b1ad7c)] - **buffer**: clean up usage of __proto__ (Trevor Norris) [#3080](https://github.com/nodejs/node/pull/3080)
+* [[`af24376e18`](https://github.com/nodejs/node/commit/af24376e18)] - **build**: Intl: deps: bump ICU to 56.1 (GA) (Steven R. Loomis) [#3281](https://github.com/nodejs/node/pull/3281)
+* [[`9136359d57`](https://github.com/nodejs/node/commit/9136359d57)] - **build**: make icu download path customizable (Johan Bergström) [#3200](https://github.com/nodejs/node/pull/3200)
+* [[`b3c5ad10a8`](https://github.com/nodejs/node/commit/b3c5ad10a8)] - **build**: add --with-arm-fpu option (Jérémy Lal) [#3228](https://github.com/nodejs/node/pull/3228)
+* [[`f00f3268e4`](https://github.com/nodejs/node/commit/f00f3268e4)] - **build**: intl: avoid 'duplicate main()' on ICU 56 (Steven R. Loomis) [#3066](https://github.com/nodejs/node/pull/3066)
+* [[`071c72a6a3`](https://github.com/nodejs/node/commit/071c72a6a3)] - **deps**: upgrade to npm 2.14.7 (Kat Marchán) [#3299](https://github.com/nodejs/node/pull/3299)
+* [[`8b50e95f06`](https://github.com/nodejs/node/commit/8b50e95f06)] - **(SEMVER-MINOR)** **deps**: backport 1ee712a from V8 upstream (Julien Gilli) [#3036](https://github.com/nodejs/node/pull/3036)
+* [[`747271372f`](https://github.com/nodejs/node/commit/747271372f)] - **doc**: update the assert module summary (David Boivin) [#2799](https://github.com/nodejs/node/pull/2799)
+* [[`0d506556b0`](https://github.com/nodejs/node/commit/0d506556b0)] - **doc**: replace node-gyp link with nodejs/node-gyp (Roman Klauke) [#3320](https://github.com/nodejs/node/pull/3320)
+* [[`40a159e4f4`](https://github.com/nodejs/node/commit/40a159e4f4)] - **doc**: Amend capitalization of word JavaScript (Dave Hodder) [#3285](https://github.com/nodejs/node/pull/3285)
+* [[`6dd34761fd`](https://github.com/nodejs/node/commit/6dd34761fd)] - **doc**: add method links in dns.markdown (Alejandro Oviedo) [#3196](https://github.com/nodejs/node/pull/3196)
+* [[`333e8336be`](https://github.com/nodejs/node/commit/333e8336be)] - **doc**: add method links in child_process.markdown (Alejandro Oviedo) [#3186](https://github.com/nodejs/node/pull/3186)
+* [[`0cfc6d39ca`](https://github.com/nodejs/node/commit/0cfc6d39ca)] - **doc**: recommend Infinity on emitter.setMaxListeners (Jason Karns) [#2559](https://github.com/nodejs/node/pull/2559)
+* [[`d4fc6d93ef`](https://github.com/nodejs/node/commit/d4fc6d93ef)] - **doc**: add help repo link to CONTRIBUTING.md (Doug Shamoo) [#3233](https://github.com/nodejs/node/pull/3233)
+* [[`28aac7f19d`](https://github.com/nodejs/node/commit/28aac7f19d)] - **doc**: add TLS session resumption example (Roman Reiss) [#3147](https://github.com/nodejs/node/pull/3147)
+* [[`365cf22cce`](https://github.com/nodejs/node/commit/365cf22cce)] - **doc**: update AUTHORS list (Rod Vagg) [#3211](https://github.com/nodejs/node/pull/3211)
+* [[`d4399613b7`](https://github.com/nodejs/node/commit/d4399613b7)] - **doc**: standardize references to userland (Martial) [#3192](https://github.com/nodejs/node/pull/3192)
+* [[`75de258376`](https://github.com/nodejs/node/commit/75de258376)] - **doc**: fix spelling in Buffer documentation (Rod Machen) [#3226](https://github.com/nodejs/node/pull/3226)
+* [[`725c7276dd`](https://github.com/nodejs/node/commit/725c7276dd)] - **doc**: fix README.md link to joyent/node intl wiki (Steven R. Loomis) [#3067](https://github.com/nodejs/node/pull/3067)
+* [[`4a35ba4966`](https://github.com/nodejs/node/commit/4a35ba4966)] - **(SEMVER-MINOR)** **fs**: include filename in watch errors (charlierudolph) [#2748](https://github.com/nodejs/node/pull/2748)
+* [[`2ddbbfd164`](https://github.com/nodejs/node/commit/2ddbbfd164)] - **http**: cork/uncork before flushing pipelined res (Fedor Indutny) [#3172](https://github.com/nodejs/node/pull/3172)
+* [[`f638402e2f`](https://github.com/nodejs/node/commit/f638402e2f)] - **http**: add comment about `outputSize` in res/server (Fedor Indutny) [#3128](https://github.com/nodejs/node/pull/3128)
+* [[`1850879b0e`](https://github.com/nodejs/node/commit/1850879b0e)] - **js_stream**: prevent abort if isalive doesn't exist (Trevor Norris) [#3282](https://github.com/nodejs/node/pull/3282)
+* [[`63644dd1cd`](https://github.com/nodejs/node/commit/63644dd1cd)] - **lib**: remove redundant code, add tests in timers.js (Rich Trott) [#3143](https://github.com/nodejs/node/pull/3143)
+* [[`74f443583c`](https://github.com/nodejs/node/commit/74f443583c)] - **module**: use UNC paths when loading native addons (Justin Chase) [#2965](https://github.com/nodejs/node/pull/2965)
+* [[`01cb3fc36b`](https://github.com/nodejs/node/commit/01cb3fc36b)] - **net**: don't throw on bytesWritten access (Trevor Norris) [#3305](https://github.com/nodejs/node/pull/3305)
+* [[`9d65528b01`](https://github.com/nodejs/node/commit/9d65528b01)] - **(SEMVER-MINOR)** **node**: add -c|--check CLI arg to syntax check script (Dave Eddy) [#2411](https://github.com/nodejs/node/pull/2411)
+* [[`42b936e78d`](https://github.com/nodejs/node/commit/42b936e78d)] - **(SEMVER-MINOR)** **src**: add process.release.lts property (Rod Vagg) [#3212](https://github.com/nodejs/node/pull/3212)
+* [[`589287b2e3`](https://github.com/nodejs/node/commit/589287b2e3)] - **src**: convert BE-utf16-string to LE before search (Karl Skomski) [#3295](https://github.com/nodejs/node/pull/3295)
+* [[`2314378f06`](https://github.com/nodejs/node/commit/2314378f06)] - **src**: fix u-a-free if uv returns err in ASYNC_CALL (Karl Skomski) [#3049](https://github.com/nodejs/node/pull/3049)
+* [[`d99336a391`](https://github.com/nodejs/node/commit/d99336a391)] - **(SEMVER-MINOR)** **src**: replace naive search in Buffer::IndexOf (Karl Skomski) [#2539](https://github.com/nodejs/node/pull/2539)
+* [[`546e8333ba`](https://github.com/nodejs/node/commit/546e8333ba)] - **(SEMVER-MINOR)** **src**: fix --abort-on-uncaught-exception (Jeremy Whitlock) [#3036](https://github.com/nodejs/node/pull/3036)
+* [[`7271cb047c`](https://github.com/nodejs/node/commit/7271cb047c)] - **(SEMVER-MINOR)** **src**: add process.versions.icu (Evan Lucas) [#3102](https://github.com/nodejs/node/pull/3102)
+* [[`7b9f78acb2`](https://github.com/nodejs/node/commit/7b9f78acb2)] - **stream**: avoid pause with unpipe in buffered write (Brian White) [#2325](https://github.com/nodejs/node/pull/2325)
+* [[`f0f8afd879`](https://github.com/nodejs/node/commit/f0f8afd879)] - **test**: remove common.inspect() (Rich Trott) [#3257](https://github.com/nodejs/node/pull/3257)
+* [[`5ca4f6f8bd`](https://github.com/nodejs/node/commit/5ca4f6f8bd)] - **test**: test `util` rather than `common` (Rich Trott) [#3256](https://github.com/nodejs/node/pull/3256)
+* [[`7a5ae34345`](https://github.com/nodejs/node/commit/7a5ae34345)] - **test**: refresh temp directory when using pipe (Rich Trott) [#3231](https://github.com/nodejs/node/pull/3231)
+* [[`7c85557ef0`](https://github.com/nodejs/node/commit/7c85557ef0)] - **test**: Fix test-fs-read-stream-fd-leak race cond (Junliang Yan) [#3218](https://github.com/nodejs/node/pull/3218)
+* [[`26a7ec6960`](https://github.com/nodejs/node/commit/26a7ec6960)] - **test**: fix losing original env vars issue (Junliang Yan) [#3190](https://github.com/nodejs/node/pull/3190)
+* [[`e922716192`](https://github.com/nodejs/node/commit/e922716192)] - **test**: remove deprecated error logging (Rich Trott) [#3079](https://github.com/nodejs/node/pull/3079)
+* [[`8f29d95a8c`](https://github.com/nodejs/node/commit/8f29d95a8c)] - **test**: report timeout in TapReporter (Karl Skomski) [#2647](https://github.com/nodejs/node/pull/2647)
+* [[`2d0fe4c657`](https://github.com/nodejs/node/commit/2d0fe4c657)] - **test**: linting for buffer-free-callback test (Rich Trott) [#3230](https://github.com/nodejs/node/pull/3230)
+* [[`70c9e4337e`](https://github.com/nodejs/node/commit/70c9e4337e)] - **test**: make common.js mandatory via linting rule (Rich Trott) [#3157](https://github.com/nodejs/node/pull/3157)
+* [[`b7179562aa`](https://github.com/nodejs/node/commit/b7179562aa)] - **test**: load common.js in all tests (Rich Trott) [#3157](https://github.com/nodejs/node/pull/3157)
+* [[`bab555a1c1`](https://github.com/nodejs/node/commit/bab555a1c1)] - **test**: speed up stringbytes-external test (Evan Lucas) [#3005](https://github.com/nodejs/node/pull/3005)
+* [[`ddf258376d`](https://github.com/nodejs/node/commit/ddf258376d)] - **test**: use normalize() for unicode paths (Roman Reiss) [#3007](https://github.com/nodejs/node/pull/3007)
+* [[`46876d519c`](https://github.com/nodejs/node/commit/46876d519c)] - **test**: remove arguments.callee usage (Roman Reiss) [#3167](https://github.com/nodejs/node/pull/3167)
+* [[`af10df6108`](https://github.com/nodejs/node/commit/af10df6108)] - **tls**: use parent handle's close callback (Fedor Indutny) [#2991](https://github.com/nodejs/node/pull/2991)
+* [[`9c2748bad1`](https://github.com/nodejs/node/commit/9c2748bad1)] - **tools**: remove leftover license boilerplate (Nathan Rajlich) [#3225](https://github.com/nodejs/node/pull/3225)
+* [[`5d9f83ff2a`](https://github.com/nodejs/node/commit/5d9f83ff2a)] - **tools**: apply linting to custom rules code (Rich Trott) [#3195](https://github.com/nodejs/node/pull/3195)
+* [[`18a8b2ec73`](https://github.com/nodejs/node/commit/18a8b2ec73)] - **tools**: remove unused gflags module (Ben Noordhuis) [#3220](https://github.com/nodejs/node/pull/3220)
+* [[`e0fffca836`](https://github.com/nodejs/node/commit/e0fffca836)] - **util**: fix for inspecting promises (Evan Lucas) [#3221](https://github.com/nodejs/node/pull/3221)
+* [[`8dfdee3733`](https://github.com/nodejs/node/commit/8dfdee3733)] - **util**: correctly inspect Map/Set Iterators (Evan Lucas) [#3119](https://github.com/nodejs/node/pull/3119)
+* [[`b5c51fdba0`](https://github.com/nodejs/node/commit/b5c51fdba0)] - **util**: fix check for Array constructor (Evan Lucas) [#3119](https://github.com/nodejs/node/pull/3119)
+
 ## 2015-10-05, Version 4.1.2 (Stable), @rvagg
 
 ### Notable changes