diff --git a/CHANGELOG.md b/CHANGELOG.md
index 828fe39..a965f58 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- The `API` service is now an isolated `OpenFeatureAPI` instance created by the container (SDK 2.3.0 isolated instances) instead of the `OpenFeatureAPI::getInstance()` global singleton. Provider, hooks, and evaluation context are no longer shared with other kernels running in the same PHP process.
+- `open-feature/sdk` requirement raised from `^2.2` to `^2.3` (the bundle relies on the public `OpenFeatureAPI` constructor introduced in SDK 2.3.0).
+
+### Upgrade notes
+
+- Run `composer update open-feature/sdk` if your lock file pins a version below 2.3.0.
+- Code calling `OpenFeatureAPI::getInstance()` directly now gets an instance distinct from the bundle's `API` service (different provider, hooks, and evaluation context). Inject the `API` or `Client` service instead.
+
 ## [0.3.0] - 2026-06-15
 
 ### Added
diff --git a/composer.json b/composer.json
index 0924ab6..07a9755 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
     },
     "require": {
         "php": ">=8.2",
-        "open-feature/sdk": "^2.2",
+        "open-feature/sdk": "^2.3",
         "symfony/config": "^6.4|^7.4|^8.0",
         "symfony/dependency-injection": "^6.4|^7.4|^8.0",
         "symfony/http-kernel": "^6.4|^7.4|^8.0"
diff --git a/src/Resources/config/services.php b/src/Resources/config/services.php
index 7303072..a06f9d5 100644
--- a/src/Resources/config/services.php
+++ b/src/Resources/config/services.php
@@ -20,8 +20,8 @@
 return static function (ContainerConfigurator $container): void {
     $services = $container->services();
 
-    $services->set(API::class, OpenFeatureAPI::class)
-        ->factory([OpenFeatureAPI::class, 'getInstance']);
+    // Isolated instance (SDK >= 2.3): no state shared with the global singleton or other kernels
+    $services->set(API::class, OpenFeatureAPI::class);
 
     $services->set(Client::class)
         ->factory([service(API::class), 'getClient'])