diff --git a/docs/pipelines/quality_loop.md b/docs/pipelines/quality_loop.md
index 76a6116..31cab8c 100644
--- a/docs/pipelines/quality_loop.md
+++ b/docs/pipelines/quality_loop.md
@@ -89,7 +89,7 @@ repo2rlenv quality run ./tasks/example \
   --campaign ./workspace/my-campaign \
   --out ./workspace/reviews/example-repaired \
   --repair --provider modal \
-  --runtime-wheel ./dist/repo2rlenv-0.9.0-py3-none-any.whl \
+  --runtime-wheel ./dist/repo2rlenv-0.9.1-py3-none-any.whl \
   --review-model anthropic/claude-sonnet-4-6 \
   --repair-model anthropic/claude-opus-4-6 \
   --solver-model anthropic/claude-sonnet-4-6 \
diff --git a/docs/pipelines/tasksmith.md b/docs/pipelines/tasksmith.md
index 9990046..a1c7365 100644
--- a/docs/pipelines/tasksmith.md
+++ b/docs/pipelines/tasksmith.md
@@ -71,7 +71,7 @@ uv run repo2rlenv tasksmith run examples/tasksmith-pr.json \
   --options examples/tasksmith-options.json \
   --campaign workspace/tasksmith \
   --output workspace/tasksmith/run \
-  --runtime-wheel dist/repo2rlenv-0.9.0-py3-none-any.whl \
+  --runtime-wheel dist/repo2rlenv-0.9.1-py3-none-any.whl \
   --env-file .env
 uv run repo2rlenv tasksmith show workspace/tasksmith/run --json
 ```
diff --git a/docs/release_notes/HISTORY.md b/docs/release_notes/HISTORY.md
index 2b71867..d943296 100644
--- a/docs/release_notes/HISTORY.md
+++ b/docs/release_notes/HISTORY.md
@@ -6,6 +6,31 @@ only the compressed summary; the detail lives here.
 For per-release deep dives see the sibling pages (`v0.8.2.post3.md`,
 `v0.8.3/`).
 
+## v0.9.1 — Windows CLI startup and release checks
+
+Released September 15, 2026.
+
+Fixes the Windows CLI crash introduced in 0.9.0: even `--version` and `--help`
+previously failed while importing the POSIX-only `fcntl` module. A shared
+standard-library lock now uses `flock` on POSIX and byte-range locking on
+Windows, preserving exclusive controller ownership and the blocking history
+checkout lock. Thanks to KNambiarDJsc for the report and initial fix
+([#128](https://github.com/huggingface/Repo2RLEnv/issues/128),
+[#129](https://github.com/huggingface/Repo2RLEnv/pull/129)).
+
+CI and publication now require fresh Windows wheel checks on Python 3.12–3.14:
+CLI startup, recipe discovery, native UTF-8 task emission/static validation and
+real process-lock contention. Full native Windows Tasksmith, research-recipe
+and quality-controller execution remains unsupported; use Linux, macOS or WSL.
+The remaining artifact-permission and process-cleanup work is tracked in
+[#130](https://github.com/huggingface/Repo2RLEnv/issues/130).
+
+This release also includes the Python, documentation/build-tool and Pi/OpenCode
+runtime dependency updates merged after 0.9.0. Upgrade with
+`pip install --upgrade --upgrade-strategy eager repo2rlenv==0.9.1`, including any
+extras your pipeline needs. The Windows CLI/locking fix does not require changes
+to existing generated datasets. Versioned examples use the 0.9.1 runtime wheel.
+
 ## v0.9.0 — Tasksmith and owned generation recipes
 
 Released September 15, 2026.
diff --git a/examples/owned-cli-gym.yaml b/examples/owned-cli-gym.yaml
index 0cbaee8..e013c36 100644
--- a/examples/owned-cli-gym.yaml
+++ b/examples/owned-cli-gym.yaml
@@ -22,7 +22,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: cli-gym-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/cli-gym
diff --git a/examples/owned-dataarc.yaml b/examples/owned-dataarc.yaml
index 6252cee..e9995e4 100644
--- a/examples/owned-dataarc.yaml
+++ b/examples/owned-dataarc.yaml
@@ -18,7 +18,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: dataarc-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/dataarc
diff --git a/examples/owned-endless-terminals.yaml b/examples/owned-endless-terminals.yaml
index 73751c7..627a4ce 100644
--- a/examples/owned-endless-terminals.yaml
+++ b/examples/owned-endless-terminals.yaml
@@ -15,7 +15,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: endless-terminals-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/endless_terminals
diff --git a/examples/owned-r2e-gym.yaml b/examples/owned-r2e-gym.yaml
index da606e9..8f99339 100644
--- a/examples/owned-r2e-gym.yaml
+++ b/examples/owned-r2e-gym.yaml
@@ -23,7 +23,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: r2e-gym-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/r2e_gym
diff --git a/examples/owned-r2e.yaml b/examples/owned-r2e.yaml
index 2095264..790fffc 100644
--- a/examples/owned-r2e.yaml
+++ b/examples/owned-r2e.yaml
@@ -22,7 +22,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: r2e-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 13000
 output:
   destination: workspace/campaign/generated/r2e
diff --git a/examples/owned-scaler.yaml b/examples/owned-scaler.yaml
index 8e291da..a9f8afe 100644
--- a/examples/owned-scaler.yaml
+++ b/examples/owned-scaler.yaml
@@ -14,7 +14,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: scaler-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/scaler
diff --git a/examples/owned-seta-evol.yaml b/examples/owned-seta-evol.yaml
index 9b635e3..7fe1062 100644
--- a/examples/owned-seta-evol.yaml
+++ b/examples/owned-seta-evol.yaml
@@ -17,7 +17,7 @@ execution:
   campaign_dir: workspace/seta
   run_id: seta-evol-first
   worker_receipt: workspace/seta/workers/seta-worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 7200
 output:
   destination: workspace/seta/evolved
diff --git a/examples/owned-seta.yaml b/examples/owned-seta.yaml
index 51c5882..2f1b228 100644
--- a/examples/owned-seta.yaml
+++ b/examples/owned-seta.yaml
@@ -15,7 +15,7 @@ execution:
   campaign_dir: workspace/seta
   run_id: seta-first
   worker_receipt: workspace/seta/workers/seta-worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 7200
 output:
   destination: workspace/seta/tasks
diff --git a/examples/owned-swe-flow.yaml b/examples/owned-swe-flow.yaml
index 9482ec8..b487adf 100644
--- a/examples/owned-swe-flow.yaml
+++ b/examples/owned-swe-flow.yaml
@@ -22,7 +22,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: swe-flow-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 10000
 output:
   destination: workspace/campaign/generated/swe-flow
diff --git a/examples/owned-swe-gen.yaml b/examples/owned-swe-gen.yaml
index c088662..9203c2a 100644
--- a/examples/owned-swe-gen.yaml
+++ b/examples/owned-swe-gen.yaml
@@ -19,7 +19,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: swe-gen-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 10000
 output:
   destination: workspace/campaign/generated/swe-gen
diff --git a/examples/owned-swe-next.yaml b/examples/owned-swe-next.yaml
index 5c8e57e..bb7d98e 100644
--- a/examples/owned-swe-next.yaml
+++ b/examples/owned-swe-next.yaml
@@ -23,7 +23,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: swe-next-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/swe_next
diff --git a/examples/owned-swe-smith.yaml b/examples/owned-swe-smith.yaml
index 8118a21..296e224 100644
--- a/examples/owned-swe-smith.yaml
+++ b/examples/owned-swe-smith.yaml
@@ -19,7 +19,7 @@ execution:
   campaign_dir: workspace/smith
   run_id: smith-first
   worker_receipt: workspace/smith/workers/smith-worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 1800
 output:
   destination: workspace/smith/tasks
diff --git a/examples/owned-terminalworld.yaml b/examples/owned-terminalworld.yaml
index 0266eee..a5219d8 100644
--- a/examples/owned-terminalworld.yaml
+++ b/examples/owned-terminalworld.yaml
@@ -16,7 +16,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: terminalworld-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/terminalworld
diff --git a/examples/owned-tmax.yaml b/examples/owned-tmax.yaml
index 472b191..5114c90 100644
--- a/examples/owned-tmax.yaml
+++ b/examples/owned-tmax.yaml
@@ -15,7 +15,7 @@ execution:
   campaign_dir: workspace/campaign
   run_id: tmax-first
   worker_receipt: workspace/campaign/workers/worker.json
-  runtime_wheel: dist/repo2rlenv-0.9.0-py3-none-any.whl
+  runtime_wheel: dist/repo2rlenv-0.9.1-py3-none-any.whl
   timeout_sec: 14000
 output:
   destination: workspace/generated/tmax
diff --git a/pyproject.toml b/pyproject.toml
index d20144b..a6f5e3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "repo2rlenv"
-version = "0.9.0"
+version = "0.9.1"
 description = "Turn any repository into an RL environment for training and evaluation."
 readme = "README.md"
 license = "Apache-2.0 AND MIT"
diff --git a/uv.lock b/uv.lock
index fd7554b..6e18c5a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2543,7 +2543,7 @@ wheels = [
 
 [[package]]
 name = "repo2rlenv"
-version = "0.9.0"
+version = "0.9.1"
 source = { editable = "." }
 dependencies = [
     { name = "aiohttp" },