diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d54714..c358bcf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-## [1.0.0] - 2025-12-11
+## [1.0.0a] - 2025-12-11
 
 ### Added
 - **CI/CD Pipeline**: Release-triggered automated builds
@@ -314,8 +314,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - CORS middleware
 - Exception handlers (OpenAI-compatible error format)
 
-[Unreleased]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v1.0.0...main
-[1.0.0]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v0.2.5...v1.0.0
+[Unreleased]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v1.0.0a...main
+[1.0.0a]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v0.2.5...v1.0.0a
 [0.2.5]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v0.2.0...v0.2.5
 [0.2.0]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v0.1.1...v0.2.0
 [0.1.1]: https://git.schweitz.net/jpmschweitzer/tatlock/compare/v0.1.0...v0.1.1
diff --git a/pyproject.toml b/pyproject.toml
index 1734832..6f751c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "tatlock"
-version = "1.0.0"
+version = "1.0.0a"
 description = "OpenAI-compatible API with Ollama backend"
 requires-python = ">=3.12"
 dependencies = []