diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb4827bd..e337e762 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,183 +1,418 @@
 # Changelog
 
-## Pending - [4.0.2]
+All notable changes to this project will be documented in this file, in reverse chronological order by release.
 
-## [4.0.1] 2020-02-04
+## 4.0.2 - TBD
+
+### Added
+
+- Nothing.
+
+### Changed
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
 
 ### Fixed
 
- - Fixed bug where cyclic references would cause memory leak in long-running processes (#158)
+- Nothing.
 
-## [4.0.0] 2020-01-08
+## 4.0.1 - 2020-02-04
 
- - Added configuration option `disabled_instruments` to be used by framework specific bindings (#156)
- - More test coverage (#155)
+### Added
+
+- Nothing.
+
+### Changed
+
+- Nothing.
 
-## [3.1.0] 2019-12-31
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#158](https://github.com/scoutapp/scout-apm-php/pull/158) Fixed bug where cyclic references would cause memory leak in long-running processes
+
+## 4.0.0 - 2020-01-08
 
 ### Added
 
- - Add check to make sure we have a recent version of the PHP extension (#151)
- - Capture request queue time (#149)
+- Nothing.
 
 ### Changed
 
- - Added some Agent test coverage (#152)
- - Updated framework/framework version to come from configuration, not hard-coded (#150)
+- [#156](https://github.com/scoutapp/scout-apm-php/pull/156) Added configuration option `disabled_instruments` to be used by framework specific bindings
+- [#155](https://github.com/scoutapp/scout-apm-php/pull/155) More test coverage
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
 
-## [3.0.0] 2019-12-19
+## 3.1.0 - 2019-12-31
 
 ### Added
 
- - [BC] Added new method `Scoutapm\ScoutApmAgent::startNewRequest` (#148)
-   - implementors of `Scoutapm\ScoutApmAgent` will now need to implement this new method
+- [#151](https://github.com/scoutapp/scout-apm-php/pull/151) Add check to make sure we have a recent version of the PHP extension
+- [#149](https://github.com/scoutapp/scout-apm-php/pull/149) Capture request queue time
+
+### Changed
+
+- [#152](https://github.com/scoutapp/scout-apm-php/pull/152) Added some Agent test coverage
+- [#150](https://github.com/scoutapp/scout-apm-php/pull/150) Updated framework/framework version to come from configuration, not hard-coded
+
+### Deprecated
 
-## [2.1.1] 2019-12-17
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
+## 3.0.0 - 2019-12-19
+
+### Added
+
+- [#148](https://github.com/scoutapp/scout-apm-php/pull/148) **[BC]** Added new method `Scoutapm\ScoutApmAgent::startNewRequest`
+  - implementors of `Scoutapm\ScoutApmAgent` will now need to implement this new method
+
+### Changed
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
+## 2.1.1 - 2019-12-17
+
+### Added
+
+- Nothing.
 
 ### Changed
 
- - Increase core version to 1.2.7 (#140)
-   - Fixes some upstream bugs with payload delivery
- - Only tag args from PHP internal functions if there are any (#141)
+- [#140](https://github.com/scoutapp/scout-apm-php/pull/140) Increase core version to 1.2.7
+  - Fixes some upstream bugs with payload delivery
+- [#141](https://github.com/scoutapp/scout-apm-php/pull/141) Only tag args from PHP internal functions if there are any
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
 
 ### Fixed
 
- - Suppress notices/errors emitted from socket calls (#144)
- - Only register with core agent once per connection (#145)
- - Do not pre-emptively connect if monitoring is disabled (#146)
+- [#144](https://github.com/scoutapp/scout-apm-php/pull/144) Suppress notices/errors emitted from socket calls
+- [#145](https://github.com/scoutapp/scout-apm-php/pull/145) Only register with core agent once per connection
+- [#146](https://github.com/scoutapp/scout-apm-php/pull/146) Do not pre-emptively connect if monitoring is disabled
 
-## [2.1.0] 2019-12-16
+## 2.1.0 - 2019-12-16
 
 ### Added
 
- - Reset the request after each call to `send()`
+- Reset the request after each call to `send()`
+
+### Changed
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
 
-## [2.0.1] 2019-12-09
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
+## 2.0.1 - 2019-12-09
+
+### Added
+
+- Nothing.
 
 ### Changed
 
- - Correctly handle warnings raised during core agent connections (#130)
- - Support PHP 7.4 (#131)
- - Removed incorrect auto detection of SCM subdirectory (#133)
- - Catch exceptions raised whilst sending metadata (#134)
+- [#130](https://github.com/scoutapp/scout-apm-php/pull/130) Correctly handle warnings raised during core agent connections
+- [#131](https://github.com/scoutapp/scout-apm-php/pull/131) Support PHP 7.4
+- [#133](https://github.com/scoutapp/scout-apm-php/pull/133) Removed incorrect auto detection of SCM subdirectory
+- [#134](https://github.com/scoutapp/scout-apm-php/pull/134) Catch exceptions raised whilst sending metadata
+
+### Deprecated
 
-## [2.0.0] 2019-12-04
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
+## 2.0.0 - 2019-12-04
 
 ### Added
 
- - Added `language_version` key to be sent with metadata (#110)
- - Added more debug logging to isolate issues easier (#111, #115, #117)
- - Added detection of `musl` by checking if `/etc/alpine-release` exists (#118)
- - **[BC]** Third parameter for `\Scoutapm\Agent::fromConfig` is now a `\Psr\SimpleCache\CacheInterface` implementation (`null`-able) (#123)
-   - Unlikely to affect most customers, unless they explicitly provided a `\Scoutapm\Connector\Connector` implementation to the `Agent`
+- [#110](https://github.com/scoutapp/scout-apm-php/pull/110) Added `language_version` key to be sent with metadata
+- [#111](https://github.com/scoutapp/scout-apm-php/pull/111) [#115](https://github.com/scoutapp/scout-apm-php/pull/115) [#117](https://github.com/scoutapp/scout-apm-php/pull/117) Added more debug logging to isolate issues easier
+- [#118](https://github.com/scoutapp/scout-apm-php/pull/118) Added detection of `musl` by checking if `/etc/alpine-release` exists
+- [#123](https://github.com/scoutapp/scout-apm-php/pull/123) **[BC]** Third parameter for `\Scoutapm\Agent::fromConfig` is now a `\Psr\SimpleCache\CacheInterface` implementation (`null`-able)
+  - Unlikely to affect most customers, unless they explicitly provided a `\Scoutapm\Connector\Connector` implementation to the `Agent`
 
 ### Changed
 
- - **[BC]** `\Scoutapm\Connector\Connector::sendCommand` now returns `string` not `bool`
-   - Unlikely to affect most customers, unless they wrote a custom implementation of `\Scoutapm\Connector\Connector`
- - **[BC]** `\Scoutapm\Agent::fromConfig()` second parameter for a `\Psr\Log\LoggerInterface` implementation is no longer optional
-   - You should pass in an implementation of `\Psr\Log\LoggerInterface` as the second parameter
-   - If you do not want logging, you can use `\Psr\Log\NullLogger` (although this is not advisable)
- - Updated core agent version to `1.2.6` (#127)
+- **[BC]** `\Scoutapm\Connector\Connector::sendCommand` now returns `string` not `bool`
+  - Unlikely to affect most customers, unless they wrote a custom implementation of `\Scoutapm\Connector\Connector`
+- **[BC]** `\Scoutapm\Agent::fromConfig()` second parameter for a `\Psr\Log\LoggerInterface` implementation is no longer optional
+  - You should pass in an implementation of `\Psr\Log\LoggerInterface` as the second parameter
+  - If you do not want logging, you can use `\Psr\Log\NullLogger` (although this is not advisable)
+- [#127](https://github.com/scoutapp/scout-apm-php/pull/127) Updated core agent version to `1.2.6`
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- **[BC]** `\Scoutapm\Agent::__construct` is now private
+  - Use the named constructor `\Scoutapm\Agent::fromConfig()` instead
+- **[BC]** `\Scoutapm\Agent::fromDefaults()` named constructor was removed
+  - For exactly matching behaviour, use `::fromConfig(new \Scoutapm\Config(), new \Psr\Log\NullLogger())`
 
 ### Fixed
 
- - Fixing bug with instrumentation delivery to dashboard (#126)
- - Handle warning that was escaping from `socket_connect` (#124)
+- [#126](https://github.com/scoutapp/scout-apm-php/pull/126) Fixing bug with instrumentation delivery to dashboard
+- [#124](https://github.com/scoutapp/scout-apm-php/pull/124) Handle warning that was escaping from `socket_connect`
+
+## 1.0.0 - 2019-11-05
+
+### Added
+
+- Nothing.
+
+### Changed
+
+- [#106](https://github.com/scoutapp/scout-apm-php/pull/106) Improved error message when invalid log level given for `log_level` configuration
+- [#109](https://github.com/scoutapp/scout-apm-php/pull/109) Updated installation instructions to remove `-alpha` flag from PHP extension
+
+### Deprecated
+
+- Nothing.
 
 ### Removed
 
- - **[BC]** `\Scoutapm\Agent::__construct` is now private
-   - Use the named constructor `\Scoutapm\Agent::fromConfig()` instead
- - **[BC]** `\Scoutapm\Agent::fromDefaults()` named constructor was removed
-   - For exactly matching behaviour, use `::fromConfig(new \Scoutapm\Config(), new \Psr\Log\NullLogger())`
+- Nothing.
 
-## [1.0.0] 2019-11-05
+### Fixed
+
+- Nothing.
+
+## 0.2.3 - 2019-10-22
+
+### Added
+
+- [#83](https://github.com/scoutapp/scout-apm-php/pull/83) New `\Scoutapm\Config\ConfigKey` class containing `public const`s for configuration key names
+- [#83](https://github.com/scoutapp/scout-apm-php/pull/83) Added config key `log_level` which overrides Scout APM's minimum log level
+- [#88](https://github.com/scoutapp/scout-apm-php/pull/88) Added more new config keys:
+  - `application_root` (defaults to `composer.json` location, or `$_SERVER['DOCUMENT_ROOT']`
+  - `scm_subdirectory` (defaults to `.git` location, or `application_root` value)
+  - `revision_sha` (defaults to version detected by `ocramius/package-versions`)
+  - `hostname` (defaults to value of `gethostname()`)
+  - `core_agent_permissions` (defaults to `0777`)
+- Added warning when `name` or `key` configurations are not set
+- [#93](https://github.com/scoutapp/scout-apm-php/pull/93) All log messages are prepended with `[Scout]`
+- [#81](https://github.com/scoutapp/scout-apm-php/pull/81) Build status badges added to README
+- [#89](https://github.com/scoutapp/scout-apm-php/pull/89) Added memory usage statistics to request
+- [#96](https://github.com/scoutapp/scout-apm-php/pull/96) Suppress backtraces for Controller, Job, and Middleware spans
+- [#102](https://github.com/scoutapp/scout-apm-php/pull/103) Tag the request URI automatically with `$_SERVER['REQUEST_URI']` or override with alternative
+- [#103](https://github.com/scoutapp/scout-apm-php/pull/103) Update CoreAgent to 1.2.4
 
 ### Changed
 
- - Improved error message when invalid log level given for `log_level` configuration (#106)
- - Updated installation instructions to remove `-alpha` flag from PHP extension (#109)
+- [#83](https://github.com/scoutapp/scout-apm-php/pull/83) **[BC]** Renamed the following configuration keys
+  - `log_level` => `core_agent_log_level`
+  - `log_file` => `core_agent_log_file`
+  - `config_file` => `core_agent_config_file`
+  - `socket_path` => `core_agent_socket_path`
+  - `download_url` => `core_agent_download_url`
+- [#84](https://github.com/scoutapp/scout-apm-php/pull/84) Improved stack trace filtering
+- [#92](https://github.com/scoutapp/scout-apm-php/pull/92) CI updated to use `pecl` to install scoutapm extension
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
 
-## [0.2.3] 2019-10-22
+ - [#91](https://github.com/scoutapp/scout-apm-php/pull/91) Fixed missing request stop timestamp
+
+## 0.2.2 - 2019-09-26
 
 ### Added
 
- - New `\Scoutapm\Config\ConfigKey` class containing `public const`s for configuration key names (#83)
- - Added config key `log_level` which overrides Scout APM's minimum log level (#83)
- - Added more new config keys (#88):
-   - `application_root` (defaults to `composer.json` location, or `$_SERVER['DOCUMENT_ROOT']`
-   - `scm_subdirectory` (defaults to `.git` location, or `application_root` value)
-   - `revision_sha` (defaults to version detected by `ocramius/package-versions`)
-   - `hostname` (defaults to value of `gethostname()`)
-   - `core_agent_permissions` (defaults to `0777`)
- - Added warning when `name` or `key` configurations are not set
- - All log messages are prepended with `[Scout]` (#93)
- - Build status badges added to README (#81)
- - Added memory usage statistics to request (#89)
- - Suppress backtraces for Controller, Job, and Middleware spans (#96)
- - Tag the request URI automatically with `$_SERVER['REQUEST_URI']` or override with alternative (#102)
- - Update CoreAgent to 1.2.4 (#103)
+- Nothing.
+
+### Changed
+
+- Nothing.
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
 
 ### Fixed
 
- - Fixed missing request stop timestamp (#91)
+- [#80](https://github.com/scoutapp/scout-apm-php/pull/80) Corrected naming of core agent config values
+
+## 0.2.1 - 2019-09-25
+
+### Added
+
+- Nothing.
 
 ### Changed
 
- - **[BC]** Renamed the following configuration keys (#83)
-   - `log_level` => `core_agent_log_level`
-   - `log_file` => `core_agent_log_file`
-   - `config_file` => `core_agent_config_file`
-   - `socket_path` => `core_agent_socket_path`
-   - `download_url` => `core_agent_download_url`
- - Improved stack trace filtering (#84)
- - CI updated to use `pecl` to install scoutapm extension (#92)
+- [#78](https://github.com/scoutapp/scout-apm-php/pull/78) Lock CoreAgent version to 1.2.2
+- [#76](https://github.com/scoutapp/scout-apm-php/pull/76) Always provide `--log-file` parameter for core agent
+- [#72](https://github.com/scoutapp/scout-apm-php/pull/72) Added an interface for the agent `Scoutapm\ScoutApmAgent`
+- [#55](https://github.com/scoutapp/scout-apm-php/pull/55) Support fetching function call arguments from PHP ext
+
+### Deprecated
+
+- Nothing.
+
+### Removed
 
-## [0.2.2] 2019-09-26
+- Nothing.
 
 ### Fixed
 
- - Corrected naming of core agent config values (#80)
+- Nothing.
 
-## [0.2.1] 2019-09-25
+## 0.2.0 - 2019-09-11
+
+### Added
+
+- Nothing.
 
 ### Changed
 
- - Lock CoreAgent version to 1.2.2 (#78)
- - Always provide `--log-file` parameter for core agent (#76)
- - Added an interface for the agent `Scoutapm\ScoutApmAgent` (#72)
- - Support fetching function call arguments from PHP ext (#55)
+- [#47](https://github.com/scoutapp/scout-apm-php/pull/47) Internal data model now preserves order
+- [#50](https://github.com/scoutapp/scout-apm-php/pull/50) Loosen several dependency version requirements
+- [#48](https://github.com/scoutapp/scout-apm-php/pull/48) Licensed as MIT
+- [#42](https://github.com/scoutapp/scout-apm-php/pull/42) [#54](https://github.com/scoutapp/scout-apm-php/pull/54) Initial support for Scout Native Extension
+- [#43](https://github.com/scoutapp/scout-apm-php/pull/43) Updated default socket path
+- [#46](https://github.com/scoutapp/scout-apm-php/pull/46) Added integration test execution into CI
+- [#39](https://github.com/scoutapp/scout-apm-php/pull/39) Fetch `git_sha` metadata from `ocramius/package-versions`
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- Nothing.
+
+## 0.1.1 - 2019-08-22
 
-## [0.2.0] 2019-09-11
+### Added
+
+- [#33](https://github.com/scoutapp/scout-apm-php/pull/33) Added `ignore` configuration option
+- [#32](https://github.com/scoutapp/scout-apm-php/pull/32) Pass metadata along with each request made to Scout
+- [#31](https://github.com/scoutapp/scout-apm-php/pull/31) Added coercion for JSON-formatted configuration values
 
 ### Changed
 
- - Internal data model now preserves order (#47)
- - Loosen several dependency version requirements (#50)
- - Licensed as MIT (#48)
- - Initial support for Scout Native Extension (#42, #54)
- - Updated default socket path (#43)
- - Added integration test execution into CI (#46)
- - Fetch `git_sha` metadata from `ocramius/package-versions` (#39)
+- [#34](https://github.com/scoutapp/scout-apm-php/pull/34) Large refactoring internally
+  - API for creating the agent should be `Agent::fromConfig(Config::fromArray([]))` at minimum
+  - Most of what is intended to be "internal" with no promise of BC is now marked `@internal`
+  - Strict type hints introduced throughout the library
+  - Internal interfaces for `\Scoutapm\Connector\Connector`, `\Scoutapm\CoreAgent\Manager`, etc. introduced
+  - Applied `doctrine/coding-standard` throughout
+  - Applied Psalm static analysis throughout
+
+### Deprecated
+
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
+
+- [#38](https://github.com/scoutapp/scout-apm-php/pull/38) Fixed agent launch bug
+
+## 0.1.0 - 2019-08-05
+
+### Added
 
-## [0.1.1] 2019-08-22
+- Initial Release. See documentation at https://docs.scoutapm.com
 
 ### Changed
 
- - Fixed agent launch bug (#38)
- - Large refactoring internally (#34)
-   - API for creating the agent should be `Agent::fromConfig(Config::fromArray([]))` at minimum
-   - Most of what is intended to be "internal" with no promise of BC is now marked `@internal`
-   - Strict type hints introduced throughout the library
-   - Internal interfaces for `\Scoutapm\Connector\Connector`, `\Scoutapm\CoreAgent\Manager`, etc. introduced
-   - Applied `doctrine/coding-standard` throughout
-   - Applied Psalm static analysis throughout
- - Added `ignore` configuration option (#33)
- - Pass metadata along with each request made to Scout (#32)
- - Added coercion for JSON-formatted configuration values (#31)
+- Nothing.
 
-## [0.1] 2019-08-05
+### Deprecated
 
-Initial Release. See documentation at https://docs.scoutapm.com
+- Nothing.
+
+### Removed
+
+- Nothing.
+
+### Fixed
 
+- Nothing.