From cb8834fbb216992734b41eacd8898e9733e9a078 Mon Sep 17 00:00:00 2001
From: "flixopt-release-bot[bot]"
 <246706635+flixopt-release-bot[bot]@users.noreply.github.com>
Date: Tue, 8 Sep 2026 10:21:17 +0000
Subject: [PATCH] chore(main): release 9.0.0

---
 .release-please-manifest.json |  2 +-
 CHANGELOG.md                  | 12 ++++++++++++
 CITATION.cff                  |  2 +-
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 529b133fd..928566934 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "8.1.0"
+  ".": "9.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5b002d34..14f1dc84d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,18 @@ For more details regarding the individual PRs and contributors, please refer to
 
 ---
 
+## [9.0.0](https://github.com/flixOpt/flixopt/compare/v8.1.0...v9.0.0) (2026-09-08)
+
+
+### ⚠ BREAKING CHANGES
+
+* clustering weights move from `ClusterConfig(weights={...})` to `transform.cluster(weights={...})`, and `cluster()` arguments after `cluster_duration` are now keyword-only so a positional argument cannot silently bind to the wrong parameter. tsam requirement is now `>= 4.0.0, < 5`.
+
+### Features
+
+* accept a tsam_xarray ClusteringResult in apply_clustering() ([#777](https://github.com/flixOpt/flixopt/issues/777)) ([e33918a](https://github.com/flixOpt/flixopt/commit/e33918adfc37450836d2fd3527c90df14e197fe3))
+* bump tsam to 4.0.0 and move clustering weights to a top-level argument ([#766](https://github.com/flixOpt/flixopt/issues/766)) ([83bfdc6](https://github.com/flixOpt/flixopt/commit/83bfdc6511a90921de9c694fa3d8728377f12b68))
+
 ## [8.1.0](https://github.com/flixOpt/flixopt/compare/v8.0.1...v8.1.0) (2026-09-03)
 
 
diff --git a/CITATION.cff b/CITATION.cff
index ac1ea15db..067de2ab3 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -2,7 +2,7 @@ cff-version: 1.2.0
 message: "If you use this software, please cite it as below and consider citing the related publication."
 type: software
 title: "flixopt"
-version: 8.1.0 # x-release-please-version
+version: 9.0.0 # x-release-please-version
 date-released: 2026-09-03
 url: "https://github.com/flixOpt/flixopt"
 repository-code: "https://github.com/flixOpt/flixopt"