CHANGELOG.md in elastic-apm-2.9.0 vs CHANGELOG.md in elastic-apm-2.9.1

- old
+ new

@@ -2,9 +2,15 @@
 
 All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## 2.9.1 (2019-06-28)
+
+### Fixed
+
+- Use system CA certificate if none is specified ([#460](https://github.com/elastic/apm-agent-ruby/pull/460))
+
 ## 2.9.0 (2019-06-25)
 
 ### Security
 
 - **NB:** If you are using a custom CA cert via `server_ca_cert`, versions of the agent prior to 2.9.0 may not have validated the certificate of APM Server correctly.