diff --git a/CHANGELOG.md b/CHANGELOG.md
index a70f9eb..1b173f1 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]
 
-## [0.5.0] - 2026-04-16
+## [0.5.1] - 2026-04-16
 
 ### Added
 - CLI options for all remaining env-only variables: `--serial`, `--password`, `--owm-api-key`, `--location`, `--timezone`, `--profile-name`.
@@ -72,8 +72,8 @@ Initial public release.
 - GitHub Actions release workflow using PyPI trusted publishing (OIDC).
 - GCP Cloud Run deployment instructions (`DEPLOYMENT.md`).
 
-[Unreleased]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.5.0...HEAD
-[0.5.0]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.4.0...v0.5.0
+[Unreleased]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.5.1...HEAD
+[0.5.1]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.4.0...v0.5.1
 [0.4.0]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.2.0...v0.3.0
 [0.2.0]: https://github.com/haraldschilly/solmate-optimizer/compare/v0.1.0...v0.2.0
diff --git a/CLAUDE.md b/CLAUDE.md
index bb9bc92..08f37dd 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -94,11 +94,13 @@ Releases are triggered by pushing a `v*` tag. GitHub Actions builds and publishe
 #    section with today's date, and add new compare links at the bottom.
 #    Follows Keep a Changelog conventions.
 # 2. Bump version in pyproject.toml (e.g. 0.1.0 → 0.2.0)
-# 3. Sync lockfile
+# 3. MANDATORY: sync lockfile — uv.lock must match pyproject.toml version.
+#    PyPI rejects re-uploads of deleted versions, so forgetting this
+#    forces a patch bump (e.g. v0.5.0 → v0.5.1).
 uv sync
 
-# 4. Commit
-git add CHANGELOG.md pyproject.toml uv.lock   # uv.lock is gitignored here, skip if so
+# 4. Commit — uv.lock MUST be included in the same commit as the version bump
+git add CHANGELOG.md pyproject.toml uv.lock
 git commit -m "Release v0.2.0"
 
 # 5. Tag and push — this triggers the GitHub Actions release workflow
diff --git a/pyproject.toml b/pyproject.toml
index 8f9c189..9af0620 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "solmate-optimizer"
-version = "0.5.0"
+version = "0.5.1"
 description = "Dynamically adjusts EET SolMate injection profile based on hourly electricity price and weather forecast"
 readme = "README.md"
 authors = [
diff --git a/uv.lock b/uv.lock
index 80105f1..e6d20f7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -236,7 +236,7 @@ wheels = [
 
 [[package]]
 name = "solmate-optimizer"
-version = "0.5.0"
+version = "0.5.1"
 source = { editable = "." }
 dependencies = [
     { name = "click" },