diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 9695e0e..8390882 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "9.1.0"
+  ".": "10.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 68ef09e..782d208 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # Changelog
 
+## [10.0.0](https://github.com/Flagsmith/flagsmith-engine/compare/v9.1.0...v10.0.0) (2025-10-24)
+
+### ⚠ BREAKING CHANGES
+
+- Remove `FeatureContext.feature_key`, `SegmentResult.key`
+  ([#272](https://github.com/Flagsmith/flagsmith-engine/issues/272))
+
+### Features
+
+- Remove `FeatureContext.feature_key`, `SegmentResult.key`
+  ([#272](https://github.com/Flagsmith/flagsmith-engine/issues/272))
+  ([4004b6b](https://github.com/Flagsmith/flagsmith-engine/commit/4004b6bcb8f7c4d11cd2c14dad26d419da8c7425))
+- Support implicit `IdentityContext.key` ([#274](https://github.com/Flagsmith/flagsmith-engine/issues/274))
+  ([a4826f8](https://github.com/Flagsmith/flagsmith-engine/commit/a4826f8e3333ad26bcbd53e267127fe370ca917b))
+
 ## [9.1.0](https://github.com/Flagsmith/flagsmith-engine/compare/v9.0.0...v9.1.0) (2025-10-16)
 
 ### Features
diff --git a/setup.py b/setup.py
index 3de7e14..63c8e92 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name="flagsmith-flag-engine",
-    version="9.1.0",
+    version="10.0.0",
     author="Flagsmith",
     author_email="support@flagsmith.com",
     packages=find_packages(include=["flag_engine", "flag_engine.*"]),