diff --git a/CHANGELOG.md b/CHANGELOG.md
index 01e936d..98d3f7f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+## v0.20.0
+
 ### Added
 
 - Narrow deterministic rules for PowerShell download-and-execute pipelines, forced Git directory cleanup, aggressive Docker system pruning, and Kubernetes namespace deletion.
diff --git a/CITATION.cff b/CITATION.cff
index c57d091..396e5ae 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,8 +2,8 @@ cff-version: 1.2.0
 message: "If you use AgentConfigScore in research, please cite this software."
 title: "AgentConfigScore: deterministic lint and regression checks for AI coding-agent instructions"
 type: software
-version: 0.19.0
-date-released: 2026-09-03
+version: 0.20.0
+date-released: 2026-09-06
 authors:
   - family-names: Lin
     given-names: Zhibo
diff --git a/pyproject.toml b/pyproject.toml
index cf54653..fd50827 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "agent-config-score"
-version = "0.19.0"
+version = "0.20.0"
 description = "Deterministic lint and regression gate for AGENTS.md, Claude, Cursor, Copilot, and Gemini instructions."
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/src/agent_config_score/__init__.py b/src/agent_config_score/__init__.py
index 11ac8e1..5f4bb0b 100644
--- a/src/agent_config_score/__init__.py
+++ b/src/agent_config_score/__init__.py
@@ -1 +1 @@
-__version__ = "0.19.0"
+__version__ = "0.20.0"