diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2b114496..98004448 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.27.0"
+  ".": "0.28.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3e3adbe..ae217c9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## [0.28.0](https://github.com/zaebee/codegraph-brain/compare/codegraph-brain-v0.27.0...codegraph-brain-v0.28.0) (2026-10-02)
+
+
+### Features
+
+* **bench:** agent A/B harness for cgis vs no cgis ([#547](https://github.com/zaebee/codegraph-brain/issues/547)) ([788d67f](https://github.com/zaebee/codegraph-brain/commit/788d67f230f1129379afb08596da5a4ef9e1c302))
+* **bench:** cgis-instructed and cgis-forced arms, four multi-hop impact tasks ([#549](https://github.com/zaebee/codegraph-brain/issues/549)) ([deef289](https://github.com/zaebee/codegraph-brain/commit/deef289fe9a9a302088661acbf3c6f3d33fc50fe))
+
 ## [0.27.0](https://github.com/zaebee/codegraph-brain/compare/codegraph-brain-v0.26.0...codegraph-brain-v0.27.0) (2026-10-02)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 1eb54a80..dd6620fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ packages = ["src/cgis"]
 
 [project]
 name = "codegraph-brain"
-version = "0.27.0"
+version = "0.28.0"
 description = "Semantic code graph for AI agents — deterministic FQN resolution, impact analysis and architectural drift gates, exposed over MCP."
 readme = "README.md"
 requires-python = ">=3.12"
diff --git a/server.json b/server.json
index 7bc8ce0b..b51dc517 100644
--- a/server.json
+++ b/server.json
@@ -8,13 +8,13 @@
     "source": "github",
     "id": "1260843154"
   },
-  "version": "0.27.0",
+  "version": "0.28.0",
   "packages": [
     {
       "registryType": "pypi",
       "registryBaseUrl": "https://pypi.org",
       "identifier": "codegraph-brain",
-      "version": "0.27.0",
+      "version": "0.28.0",
       "runtimeHint": "uvx",
       "transport": {
         "type": "stdio"
diff --git a/uv.lock b/uv.lock
index b97be061..0f405915 100644
--- a/uv.lock
+++ b/uv.lock
@@ -261,7 +261,7 @@ wheels = [
 
 [[package]]
 name = "codegraph-brain"
-version = "0.27.0"
+version = "0.28.0"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },