diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..73a2e66
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+# CHANGELOG
+
+<!-- version list -->
+
+## v1.0.0 (2025-08-20)
+
+- Initial Release
diff --git a/pyproject.toml b/pyproject.toml
index 46158cc..e0fada4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "zen-mcp-server"
-version = "1.1.0"
+version = "1.0.0"
 description = "AI-powered MCP server with multiple model providers"
 requires-python = ">=3.9"
 dependencies = [