diff --git a/CHANGELOG.md b/CHANGELOG.md
index 187a217..c7425ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,9 +4,17 @@ Notable changes to Agent Code Guard are recorded here.
 
 ## Unreleased
 
+## 0.3.1 - 2026-08-29
+
+### Changed
+
 - Reuse one immutable invocation context for configuration and canonical selected-file identities during ordinary multi-guard analysis, and use shared source line indexes for constant-time syntax location mapping.
 - Add a reproducible, non-CI Wayfarer benchmark harness for LOC-only, syntax-only, normal, and profiled scans.
 
+### Fixed
+
+- Restore fresh physical containment validation for baseline-enabled analysis and make benchmark output and Git-status verification fail closed.
+
 ## 0.3.0 - 2026-08-28
 
 ### Added
diff --git a/pyproject.toml b/pyproject.toml
index a91586b..3515dbd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "agent-code-guard"
-version = "0.3.0"
+version = "0.3.1"
 description = "Deterministic cross-language guardrails for agent-assisted development"
 readme = "README.md"
 requires-python = ">=3.10"