diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index f585132a..48ad3b7a 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "8.17.0"
+  ".": "8.18.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c15f82b..8a09cb8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to the LaunchDarkly Ruby SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [8.18.0](https://github.com/launchdarkly/ruby-server-sdk/compare/8.17.0...8.18.0) (2026-09-16)
+
+
+### Features
+
+* Expand version support for JSON gem v3 ([e6c7412](https://github.com/launchdarkly/ruby-server-sdk/commit/e6c7412eff9d219ed4ae448fe7cf45050998765a))
+
+
+### Bug Fixes
+
+* Log the cached-data evaluation warning only once per client ([#438](https://github.com/launchdarkly/ruby-server-sdk/issues/438)) ([bcb6e73](https://github.com/launchdarkly/ruby-server-sdk/commit/bcb6e736300a614e366066bcf5dff03e705eacc2))
+
 ## [8.17.0](https://github.com/launchdarkly/ruby-server-sdk/compare/8.16.0...8.17.0) (2026-09-08)
 
 
diff --git a/PROVENANCE.md b/PROVENANCE.md
index 4367c4a1..102cea26 100644
--- a/PROVENANCE.md
+++ b/PROVENANCE.md
@@ -9,7 +9,7 @@ To verify build provenance attestations, we recommend using the [GitHub CLI `att
 <!-- x-release-please-start-version -->
 ```
 # Set the version of the SDK to verify
-SDK_VERSION=8.17.0
+SDK_VERSION=8.18.0
 ```
 <!-- x-release-please-end -->
 
diff --git a/lib/ldclient-rb/version.rb b/lib/ldclient-rb/version.rb
index 759d8ddf..c38933b3 100644
--- a/lib/ldclient-rb/version.rb
+++ b/lib/ldclient-rb/version.rb
@@ -1,3 +1,3 @@
 module LaunchDarkly
-  VERSION = "8.17.0" # x-release-please-version
+  VERSION = "8.18.0" # x-release-please-version
 end