diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b87286..f397856 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ The format is based on [Keep a Changelog], and this project adheres to
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
 [Semantic Versioning]: https://semver.org/spec/v2.0.0.html
 
+## [0.13.6] - 2021-04-28
+
+### Fixed
+
+- Fix issue rendering Protocol Buffers diffs by upgrading to `dogmatiq/dapper` v0.4.3
+
 ## [0.13.5] - 2021-04-26
 
 ### Added
@@ -290,6 +296,7 @@ simple to migrate existing tests to the new API. Please see the
 [0.13.3]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.3
 [0.13.4]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.4
 [0.13.5]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.5
+[0.13.6]: https://github.com/dogmatiq/testkit/releases/tag/v0.13.6
 
 [v0.11.0 migration guide]: https://github.com/dogmatiq/testkit/blob/main/docs/MIGRATING-v0.11.0.md