diff --git a/CHANGELOG.md b/CHANGELOG.md
index eab2171..32e184a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,297 +1,404 @@
 # Changelog
 
-## [Unreleased]
+If you are upgrading, please see the [upgrade guide](UPGRADING.md).
+
+## [Unreleased][unreleased]
+
+### Changed
+
+- Upgrade `leveldown` from `^4.0.0` to `^5.0.0-1` ([#133](https://github.com/Level/level/issues/133)) ([**@vweevers**](https://github.com/vweevers))
+- Upgrade `level-packager` from `^3.0.0` to `^5.0.0` ([#113](https://github.com/Level/level/issues/113), [#131](https://github.com/Level/level/issues/131)) ([**@ralphtheninja**](https://github.com/ralphtheninja), [**@vweevers**](https://github.com/vweevers))
+- Prefer `var` over `const` in README ([`f032b6c`](https://github.com/Level/level/commit/f032b6c)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Upgrade `standard` devDependency from `^11.0.0` to `^12.0.0` ([#118](https://github.com/Level/level/issues/118)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Tweak copyright years for less maintenance ([`0b9c8ad`](https://github.com/Level/level/commit/0b9c8ad)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+
+### Added
+
+- Integrate `level-js` for browser support ([#135](https://github.com/Level/level/issues/135)) ([**@vweevers**](https://github.com/vweevers))
+- Add appveyor ([#112](https://github.com/Level/level/issues/112)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Enable OSX on Travis ([#111](https://github.com/Level/level/issues/111)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Add `nyc` and `coveralls` devDependencies ([#115](https://github.com/Level/level/issues/115)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Add `hallmark` devDependency ([#134](https://github.com/Level/level/issues/134)) ([**@vweevers**](https://github.com/vweevers))
+
+### Removed
+
+- Remove node 6 and 9 ([#129](https://github.com/Level/level/issues/129), [`2bf1d3f`](https://github.com/Level/level/commit/2bf1d3f)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Remove contributors from `package.json` ([`f37252d`](https://github.com/Level/level/commit/f37252d)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [4.0.0] - 2018-05-23
 
 ### Changed
-* Update `leveldown` to `^4.0.0` (@ralphtheninja)
-* Update `level-packager` to `^3.0.0` (@ralphtheninja)
-* Switch to `opencollective-postinstall` (@mateodelnorte)
+
+- Update `leveldown` to `^4.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `level-packager` to `^3.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Switch to `opencollective-postinstall` ([**@mateodelnorte**](https://github.com/mateodelnorte))
 
 ### Removed
-* Remove node 4 from Travis (@ralphtheninja)
+
+- Remove node 4 from Travis ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [3.0.2] - 2018-05-23
 
 ### Changed
-* Switch to `opencollective-postinstall` (@mateodelnorte)
+
+- Switch to `opencollective-postinstall` ([**@mateodelnorte**](https://github.com/mateodelnorte))
 
 ## [3.0.1] - 2018-05-05
 
 ### Added
-* Travis: add 10 (@ralphtheninja)
+
+- Travis: add 10 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update `standard` to `^11.0.0` (@ralphtheninja)
-* Fix typo in README (@rasmuserik)
+
+- Update `standard` to `^11.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Fix typo in README ([**@rasmuserik**](https://github.com/rasmuserik))
 
 ### Fixed
-* Fix postinstall failures with OpenCollective (@vweevers)
+
+- Fix postinstall failures with OpenCollective ([**@vweevers**](https://github.com/vweevers))
 
 ## [3.0.0] - 2018-02-17
 
 ### Added
-* Travis: add 9 (@ralphtheninja)
-* README: add table of contents (@ralphtheninja)
+
+- Travis: add 9 ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- README: add table of contents ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update `leveldown` to `^3.0.0` (@ralphtheninja)
+
+- Update `leveldown` to `^3.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.1.2] - 2018-01-26
 
 ### Added
-* Add OpenCollective (@monkeywithacupcake)
+
+- Add OpenCollective ([**@monkeywithacupcake**](https://github.com/monkeywithacupcake))
 
 ### Changed
-* README: change Travis badge from png to svg (@ralphtheninja)
+
+- README: change Travis badge from png to svg ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.1.1] - 2017-12-13
 
 ### Changed
-* README: document `.errors` property (@ralphtheninja)
+
+- README: document `.errors` property ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.1.0] - 2017-12-06
 
 ### Changed
-* Update `level-packager` to `^2.0.2` (@ralphtheninja)
-* Update `leveldown` to `^2.1.1` (@ralphtheninja)
+
+- Update `level-packager` to `^2.0.2` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `^2.1.1` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.0.1] - 2017-11-11
 
 ### Changed
-* Restore node 4 (@vweevers)
+
+- Restore node 4 ([**@vweevers**](https://github.com/vweevers))
 
 ## [2.0.0] - 2017-10-17
 
 ### Added
-* Add `standard` for linting (@ralphtheninja)
-* README: copy over docs from `levelup` (@ralphtheninja)
-* README: add node badge (@ralphtheninja)
+
+- Add `standard` for linting ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- README: copy over docs from `levelup` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- README: add node badge ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update `level-packager` to `~2.0.0` (@ralphtheninja)
-* Update `leveldown` to `~2.0.0` (@ralphtheninja)
+
+- Update `level-packager` to `~2.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `~2.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.0.0-rc3] - 2017-09-16
 
 ### Changed
-* Update `level-packager` to `2.0.0-rc3` (@ralphtheninja)
-* Update `leveldown` to `~1.8.0` (@ralphtheninja)
+
+- Update `level-packager` to `2.0.0-rc3` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `~1.8.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.0.0-rc2] - 2017-09-12
 
 ### Changed
-* Update `level-packager` to `2.0.0-rc2` (@ralphtheninja)
-* Update `leveldown` to `~1.7.2` (@ralphtheninja)
+
+- Update `level-packager` to `2.0.0-rc2` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `~1.7.2` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [2.0.0-rc1] - 2017-09-06
 
 ### Added
-* README: add Greenkeeper badge (@ralphtheninja)
-* Travis: add 8 (@ralphtheninja)
+
+- README: add Greenkeeper badge ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Travis: add 8 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update `level-packager` to `2.0.0-rc1` (@ralphtheninja)
+
+- Update `level-packager` to `2.0.0-rc1` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Removed
-* Travis: remove 0.12, 4, 5, and 7 (@ralphtheninja)
+
+- Travis: remove 0.12, 4, 5, and 7 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.7.0] - 2017-05-17
 
 ### Changed
-* Update `leveldown` to `~1.7.0` (@ralphtheninja)
+
+- Update `leveldown` to `~1.7.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.6.0] - 2017-02-06
 
 ### Added
-* Travis: add 7 (@ralphtheninja)
+
+- Travis: add 7 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update copyright year to 2017 (@ralphtheninja)
-* Update `leveldown` to `~1.6.0` (@ralphtheninja)
+
+- Update copyright year to 2017 ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `~1.6.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Removed
-* Travis: remove 0.10 (@ralphtheninja)
+
+- Travis: remove 0.10 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.5.0] - 2016-10-16
 
 ### Added
-* Travis: add 6 (@ralphtheninja)
+
+- Travis: add 6 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Use gcc 4.8 on Travis
-* Update `leveldown` to `~1.5.0` (@juliangruber)
+
+- Use gcc 4.8 on Travis
+- Update `leveldown` to `~1.5.0` ([**@juliangruber**](https://github.com/juliangruber))
 
 ### Removed
-* Travis: remove 1.0, 1.8, 2 and 3 (@ralphtheninja)
+
+- Travis: remove 1.0, 1.8, 2 and 3 ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.4.0] - 2015-11-27
 
 ### Added
-* Travis: add 1.0, 2, 3, 4 and 5 (@ralphtheninja)
-* README: add dependency badge (@ralphtheninja)
+
+- Travis: add 1.0, 2, 3, 4 and 5 ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- README: add dependency badge ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ### Changed
-* Update `level-packager` to `~1.2.0` (@ralphtheninja)
+
+- Update `level-packager` to `~1.2.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.3.0] - 2015-07-29
 
 ### Changed
-* Update `leveldown` to `~1.4.0` (@ArtskydJ)
+
+- Update `leveldown` to `~1.4.0` ([**@ArtskydJ**](https://github.com/ArtskydJ))
 
 ## [1.2.0] - 2015-06-24
 
 ### Changed
-* Update `level-packager` to `~1.1.0` (@timoxley)
-* Update `leveldown` to `~1.3.0` (@timoxley)
+
+- Update `level-packager` to `~1.1.0` ([**@timoxley**](https://github.com/timoxley))
+- Update `leveldown` to `~1.3.0` ([**@timoxley**](https://github.com/timoxley))
 
 ## [1.1.0] - 2015-06-02
 
 ### Changed
-* Update `leveldown` to `~1.2.2` for prebuilt binaries (@ralphtheninja)
+
+- Update `leveldown` to `~1.2.2` for prebuilt binaries ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.0.0] - 2015-05-19
 
 ### Changed
-* Update `level-packager` to `~1.0.0` (@ralphtheninja)
+
+- Update `level-packager` to `~1.0.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [1.0.0-0] - 2015-05-16
 
 ### Changed
-* Use `nvm` again on Travis (@ralphtheninja)
-* Moved `CONTRIBUTING.md` and contributors to `level/community` repository (@ralphtheninja)
-* Use `level-packager@next` (@ralphtheninja)
-* Update `leveldown` to `~1.0.6` (@ralphtheninja)
+
+- Use `nvm` again on Travis ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Moved `CONTRIBUTING.md` and contributors to `level/community` repository ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Use `level-packager@next` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `leveldown` to `~1.0.6` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [0.19.1] - 2015-05-05
 
 ### Changed
-* Use `n` instead of `nvm` on Travis for iojs support on native modules (@ralphtheninja)
+
+- Use `n` instead of `nvm` on Travis for iojs support on native modules ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [0.19.0] - 2015-05-05
 
 ### Changed
-* Switch to plain MIT license (@andrewrk)
-* README: update nodeico badge (@rvagg)
-* README: update logo and copyright (@ralphtheninja)
-* Update `level-packager` to `~0.19.0` (@ralphtheninja)
+
+- Switch to plain MIT license ([**@andrewrk**](https://github.com/andrewrk))
+- README: update nodeico badge ([**@rvagg**](https://github.com/rvagg))
+- README: update logo and copyright ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Update `level-packager` to `~0.19.0` ([**@ralphtheninja**](https://github.com/ralphtheninja))
 
 ## [0.18.0] - 2013-11-18
 
 ### Added
-* Add Travis (@rvagg)
+
+- Add Travis ([**@rvagg**](https://github.com/rvagg))
 
 ### Changed
-* Update `level-packager` to `~0.18.0` (@rvagg)
-* Update `leveldown` to `~0.10.0` (@rvagg)
+
+- Update `level-packager` to `~0.18.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.10.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.17.0-1] - 2013-10-09
 
 ### Changed
-* Use `level-packager` instead of `levelup` (@rvagg)
-* Run tests in `level-packager` using `tape` (@rvagg)
+
+- Use `level-packager` instead of `levelup` ([**@rvagg**](https://github.com/rvagg))
+- Run tests in `level-packager` using `tape` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.17.0] - 2013-10-01
 
 ### Changed
-* Update `levelup` to `~0.17.0` (@rvagg)
-* Update `leveldown` to `~0.9.0` (@rvagg)
+
+- Update `levelup` to `~0.17.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.9.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.16.0] - 2013-09-10
 
 ### Added
-* Add @substack to contributors (@rvagg)
+
+- Add [**@substack**](https://github.com/substack) to contributors ([**@rvagg**](https://github.com/rvagg))
 
 ### Changed
-* Update `levelup` to `~0.16.0` (@rvagg)
-* Update repository and homepage in `package.json` (@rvagg)
+
+- Update `levelup` to `~0.16.0` ([**@rvagg**](https://github.com/rvagg))
+- Update repository and homepage in `package.json` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.15.0] - 2013-08-26
 
 ### Changed
-* README: tweaks (@rvagg)
-* Update `levelup` to `~0.15.0` (@rvagg)
-* Update `leveldown` to `~0.8.0` (@rvagg)
+
+- README: tweaks ([**@rvagg**](https://github.com/rvagg))
+- Update `levelup` to `~0.15.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.8.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.14.0] - 2013-08-19
 
 ### Added
-* README: add npm downloads badge (@rvagg)
+
+- README: add npm downloads badge ([**@rvagg**](https://github.com/rvagg))
 
 ### Changed
-* Update `levelup` to `~0.14.0` (@rvagg)
+
+- Update `levelup` to `~0.14.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.13.0] - 2013-08-11
 
 ### Changed
-* Update `levelup` to `~0.13.0` (@rvagg)
-* Update `leveldown` to `~0.7.0` (@rvagg)
+
+- Update `levelup` to `~0.13.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.7.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.12.0] - 2013-07-25
 
 ### Changed
-* Update `levelup` to `~0.12.0` (@rvagg)
-* Update `leveldown` to `~0.6.2` (@rvagg)
+
+- Update `levelup` to `~0.12.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.6.2` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.11.0] - 2013-07-17
 
 ### Added
-* Add @pgte to contributors (@rvagg)
-* README: add npm badge (@rvagg)
+
+- Add [**@pgte**](https://github.com/pgte) to contributors ([**@rvagg**](https://github.com/rvagg))
+- README: add npm badge ([**@rvagg**](https://github.com/rvagg))
 
 ### Changed
-* Update `levelup` to `~0.11.0` (@rvagg)
+
+- Update `levelup` to `~0.11.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.10.0] - 2013-06-14
 
 ### Changed
-* Update `levelup` to `~0.10.0` (@rvagg)
-* Update `leveldown` to `~0.6.0` (@rvagg)
+
+- Update `levelup` to `~0.10.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.6.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## [0.9.0] - 2013-05-27
 
 ### Changed
-* Update `levelup` to `~0.9.0` (@rvagg)
-* Update `leveldown` to `~0.5.0` (@rvagg)
+
+- Update `levelup` to `~0.9.0` ([**@rvagg**](https://github.com/rvagg))
+- Update `leveldown` to `~0.5.0` ([**@rvagg**](https://github.com/rvagg))
 
 ## 0.8.0 - 2013-05-19
 
 :seedling: Initial release.
 
-[Unreleased]: https://github.com/level/level/compare/v4.0.0...HEAD
+[unreleased]: https://github.com/level/level/compare/v4.0.0...HEAD
+
 [4.0.0]: https://github.com/level/level/compare/v3.0.1...v4.0.0
+
 [3.0.2]: https://github.com/level/level/compare/v3.0.1...v3.0.2
+
 [3.0.1]: https://github.com/level/level/compare/v3.0.0...v3.0.1
+
 [3.0.0]: https://github.com/level/level/compare/v2.1.2...v3.0.0
+
 [2.1.2]: https://github.com/level/level/compare/v2.1.1...v2.1.2
+
 [2.1.1]: https://github.com/level/level/compare/v2.1.0...v2.1.1
+
 [2.1.0]: https://github.com/level/level/compare/v2.0.1...v2.1.0
+
 [2.0.1]: https://github.com/level/level/compare/v2.0.0...v2.0.1
+
 [2.0.0]: https://github.com/level/level/compare/v2.0.0-rc3...v2.0.0
+
 [2.0.0-rc3]: https://github.com/level/level/compare/v2.0.0-rc2...v2.0.0-rc3
+
 [2.0.0-rc2]: https://github.com/level/level/compare/v2.0.0-rc1...v2.0.0-rc2
+
 [2.0.0-rc1]: https://github.com/level/level/compare/v1.7.0...v2.0.0-rc1
+
 [1.7.0]: https://github.com/level/level/compare/v1.6.0...v1.7.0
+
 [1.6.0]: https://github.com/level/level/compare/v1.5.0...v1.6.0
+
 [1.5.0]: https://github.com/level/level/compare/v1.4.0...v1.5.0
+
 [1.4.0]: https://github.com/level/level/compare/v1.3.0...v1.4.0
+
 [1.3.0]: https://github.com/level/level/compare/v1.2.0...v1.3.0
+
 [1.2.0]: https://github.com/level/level/compare/v1.1.0...v1.2.0
+
 [1.1.0]: https://github.com/level/level/compare/v1.0.0...v1.1.0
+
 [1.0.0]: https://github.com/level/level/compare/v1.0.0-0...v1.0.0
+
 [1.0.0-0]: https://github.com/level/level/compare/v0.19.1...v1.0.0-0
+
 [0.19.1]: https://github.com/level/level/compare/v0.19.0...v0.19.1
+
 [0.19.0]: https://github.com/level/level/compare/0.18.0...v0.19.0
+
 [0.18.0]: https://github.com/level/level/compare/0.17.0-1...0.18.0
+
 [0.17.0-1]: https://github.com/level/level/compare/0.17.0...0.17.0-1
+
 [0.17.0]: https://github.com/level/level/compare/0.16.0...0.17.0
+
 [0.16.0]: https://github.com/level/level/compare/0.15.0...0.16.0
+
 [0.15.0]: https://github.com/level/level/compare/0.14.0...0.15.0
+
 [0.14.0]: https://github.com/level/level/compare/0.13.0...0.14.0
+
 [0.13.0]: https://github.com/level/level/compare/0.12.0...0.13.0
+
 [0.12.0]: https://github.com/level/level/compare/0.11.0...0.12.0
+
 [0.11.0]: https://github.com/level/level/compare/0.10.0...0.11.0
+
 [0.10.0]: https://github.com/level/level/compare/0.9.0...0.10.0
-[0.9.0]: https://github.com/level/level/compare/0.8.0...0.9.0
 
+[0.9.0]: https://github.com/level/level/compare/0.8.0...0.9.0
diff --git a/UPGRADING.md b/UPGRADING.md
index 7f8c05b..03cc2e6 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -2,6 +2,14 @@
 
 This document describes breaking changes and how to upgrade. For a complete list of changes including minor and patch releases, please refer to the [changelog](CHANGELOG.md).
 
+## v5
+
+_Currently available as prerelease: `npm i level@next`._
+
+Upgraded to [`leveldown@5.0.0-1`](https://github.com/Level/leveldown/blob/v5.0.0-1/UPGRADING.md#v500-rc1) and (through `level-packager@6`) [`levelup@4`](https://github.com/Level/levelup/blob/v4.0.0/UPGRADING.md#v4) and [`encoding-down@6`](https://github.com/Level/encoding-down/blob/v6.0.0/UPGRADING.md#v6). Please follow these links for more information. A quick summary: range options (e.g. `gt`) are now serialized the same as keys, `{ gt: undefined }` is not the same as `{}`, nullish values are now rejected and streams are backed by [`readable-stream@3`](https://github.com/nodejs/readable-stream#version-3xx).
+
+In addition, `level` got browser support! It uses [`leveldown`](https://github.com/Level/leveldown) in node and [`level-js`](https://github.com/Level/level-js) in browsers (backed by [IndexedDB](https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API)). As such, [`level-browserify`](https://github.com/Level/level-browserify) is not needed anymore and will be deprecated later on. To learn what the integration of `level-js` means for platform, browser and type support, please see the updated [README](README.md#supported-platforms).
+
 ## v4
 
 Dropped support for node 4. No other breaking changes.
@@ -30,6 +38,6 @@ This does not affect the existing callback API, functionality-wise or performanc
 
 For more information please check the corresponding `CHANGELOG.md` for:
 
-* [`levelup`](https://github.com/Level/levelup/blob/master/CHANGELOG.md)
-* [`leveldown`](https://github.com/Level/leveldown/blob/master/CHANGELOG.md)
-* [`level-packager`](https://github.com/Level/packager/blob/master/CHANGELOG.md)
+- [`levelup`](https://github.com/Level/levelup/blob/master/CHANGELOG.md)
+- [`leveldown`](https://github.com/Level/leveldown/blob/master/CHANGELOG.md)
+- [`level-packager`](https://github.com/Level/packager/blob/master/CHANGELOG.md)
diff --git a/package.json b/package.json
index be6b154..7f4c441 100644
--- a/package.json
+++ b/package.json
@@ -27,6 +27,7 @@
   "devDependencies": {
     "airtap": "^2.0.1",
     "coveralls": "^3.0.2",
+    "hallmark": "^0.1.0",
     "nyc": "^12.0.2",
     "pinkie": "^2.0.4",
     "standard": "^12.0.0",
@@ -38,7 +39,8 @@
     "test": "standard && nyc node test.js && verify-travis-appveyor",
     "test-browser-local": "airtap --local test-browser.js",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
-    "postinstall": "opencollective-postinstall || exit 0"
+    "postinstall": "opencollective-postinstall || exit 0",
+    "hallmark": "hallmark --fix CHANGELOG.md UPGRADING.md"
   },
   "engines": {
     "node": ">=8.6.0"