diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7481cad9..05185e29 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Optimizely Swift SDK Changelog
 
+## 6.0.0
+October 7, 2026
+
+### Breaking Changes
+
+**Swift Package Manager only**: The SDK is now distributed exclusively through Swift Package Manager. CocoaPods support has been removed, and the `OptimizelySwiftSDK` podspec will no longer be published.
+
+**Raised minimum platform versions**: To build with Xcode 27, the minimum deployment targets are now iOS 15.0, tvOS 15.0, macOS 12.0, and watchOS 9.0.
+
+- Migrate Swift SDK distribution, CI, and releases to SPM on Xcode 27 ([#658](https://github.com/optimizely/swift-sdk/pull/658))
+
 ## 5.5.0
 September 2, 2026
 
diff --git a/Sources/Utils/SDKVersion.swift b/Sources/Utils/SDKVersion.swift
index 605f8b1a..f32df2e4 100644
--- a/Sources/Utils/SDKVersion.swift
+++ b/Sources/Utils/SDKVersion.swift
@@ -17,4 +17,4 @@
 /// Do not edit this field outside a release PR.
 /// - Merging a change to this value into master (or release/**) publishes a GitHub release (.github/workflows/release.yml)
 /// - Do not put underscores in the name (Swiftlint can modify unexpectedly)
-let OPTIMIZELYSDKVERSION = "5.5.0"
+let OPTIMIZELYSDKVERSION = "6.0.0"