diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10f86b02c..f91773617 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,12 +1,22 @@
 ## [Unreleased]
 
+## [v4.8.3](https://github.com/OpenNMT/CTranslate2/releases/tag/v4.8.3) (2026-10-13)
+
 ### New features
 
-* Support converting UMT5 models from Hugging Face Transformers
+* Support converting UMT5 models from Hugging Face Transformers (#2103) by [@the-cross-art](https://github.com/the-cross-art)
 
 ### Fixes and improvements
 
-* Support Transformer models where each layer has its own relative attention bias
+* Support Transformer models where each layer has its own relative attention bias by [@the-cross-art](https://github.com/the-cross-art)
+* Fix Windows ROCm Translator hangs and DLL loading (#2106) by [@0xDELUXA](https://github.com/0xDELUXA)
+* Fix crashes when loading model files from Python file-like objects (#2110) by [@Purfview](https://github.com/Purfview)
+* Upgrade pybind11 to 2.13.6 for CPython 3.14 allocator safety (#2108) by [@cepeter](https://github.com/cepeter)
+* Guard exhausted candidates in CUDA TopK stage 2 (#2104) by [@mzggr0914](https://github.com/mzggr0914)
+* Fix Windows shutdown deadlocks and memory leaks with the Ruy backend (#2076) by [@timo9378](https://github.com/timo9378)
+* Add Clang ThreadSanitizer testing (#1986) by [@3manifold](https://github.com/3manifold)
+* Improve ROCm wheel testing and release checks; upgrade build actions to Node.js 24 (#2112) by [@jordimas](https://github.com/jordimas)
+* Add local CUDA and ROCm release validation with CI wheels and commit status reporting by [@jordimas](https://github.com/jordimas)
 
 
 ## [v4.8.2](https://github.com/OpenNMT/CTranslate2/releases/tag/v4.8.2) (2026-08-31)
diff --git a/contributors.md b/contributors.md
new file mode 100644
index 000000000..a88e50772
--- /dev/null
+++ b/contributors.md
@@ -0,0 +1,29 @@
+# Release validation
+
+1. Open a release PR and wait for CI to pass.
+2. On each Linux x86-64 GPU machine, check out the PR head and build its native
+   tests locally. Install test dependencies, model data, GPU drivers, and runtime
+   libraries, including a GPU-compatible PyTorch. Authenticate with `gh auth login`
+   using an account permitted to download artifacts and write commit statuses.
+3. Run the native and Python tests, including GPU tests:
+
+   ```bash
+   bash tools/release-check.sh cuda
+   ```
+
+   Replace `cuda` with `rocm` on the AMD machine.
+
+The script finds the current branch's PR in the GitHub repository named by `origin`.
+It checks that tracked files are clean and HEAD matches the PR, then
+publishes `release/cuda` or `release/rocm` as pending, then success or failure.
+It downloads the CUDA or ROCm wheel from the latest push CI run for that exact
+commit. Wait for the wheel artifact to be uploaded before running validation.
+The wheel is installed into a temporary environment that reuses your Python
+dependencies; the environment is removed afterwards. Your installed CTranslate2
+is left untouched. Native tests use your local build, since CI does not upload it.
+The script requires a visible GPU and both test commands to pass.
+Detailed output stays in the terminal.
+
+Configure both statuses as required checks for release PRs. Re-run validation
+for every new commit. Publish the validated artifacts after CI and both GPU
+checks pass; validate again if the final release changes the tested code.
diff --git a/python/ctranslate2/version.py b/python/ctranslate2/version.py
index ebb987b0d..eec04197c 100644
--- a/python/ctranslate2/version.py
+++ b/python/ctranslate2/version.py
@@ -1,3 +1,3 @@
 """Version information."""
 
-__version__ = "4.8.2"
+__version__ = "4.8.3"
diff --git a/tools/release-check.sh b/tools/release-check.sh
new file mode 100755
index 000000000..f65367d14
--- /dev/null
+++ b/tools/release-check.sh
@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+# Usage: bash tools/release-check.sh cuda|rocm
+set -euo pipefail
+if (( $# != 1 )) || [[ $1 != cuda && $1 != rocm ]]; then
+    echo "Usage: bash tools/release-check.sh cuda|rocm" >&2
+    exit 2
+fi
+backend=$1
+cd "$(git rev-parse --show-toplevel)"
+
+if ! git diff HEAD --quiet; then
+    echo "Commit or stash changes to tracked files before validation." >&2
+    exit 1
+fi
+if git remote get-url upstream >/dev/null 2>&1; then
+    repo=$(git remote get-url upstream)
+else
+    repo=$(git remote get-url origin)
+fi
+repo=${repo#*github.com[:/]}
+repo=${repo%.git}
+sha=$(git rev-parse HEAD)
+branch=$(git branch --show-current)
+pr=$(gh pr list --repo "$repo" --state open --head "$branch" --json number,headRefOid --jq ".[] | select(.headRefOid == \"$sha\") | .number" | head -n 1)
+if [[ -z $pr ]]; then
+    echo "Local HEAD is not the head commit of an open PR for $branch in $repo." >&2
+    exit 1
+fi
+publish() {
+    gh api "repos/$repo/statuses/$sha" \
+        -f "state=$1" -f "context=release/$backend" >/dev/null
+}
+publish pending
+state=failure
+workdir=$(mktemp -d)
+trap 'result=$?; rm -rf "$workdir"; publish "$state" || exit 1; exit "$result"' EXIT
+artifact=python-wheels-Linux-auto64
+[[ $backend == rocm ]] && artifact=rocm-python-wheels-Linux
+run=${RELEASE_CHECK_RUN_ID:-}
+if [[ -n $run ]]; then
+    artifacts=$(gh api --paginate "repos/$repo/actions/runs/$run/artifacts" --jq '.artifacts[] | select(.expired == false) | .name')
+    if [[ $'\n'"$artifacts"$'\n' != *$'\n'"$artifact"$'\n'* ]]; then
+        echo "CI run $run does not contain an available $artifact artifact." >&2
+        exit 1
+    fi
+else
+    runs=$(gh run list --repo "$repo" --workflow ci.yml --commit "$sha" --limit 100 --json databaseId --jq '.[].databaseId')
+    for candidate in $runs; do
+        artifacts=$(gh api --paginate "repos/$repo/actions/runs/$candidate/artifacts" --jq '.artifacts[] | select(.expired == false) | .name')
+        if [[ $'\n'"$artifacts"$'\n' == *$'\n'"$artifact"$'\n'* ]]; then
+            run=$candidate
+            break
+        fi
+    done
+fi
+if [[ -z $run ]]; then
+    echo "No CI run for commit $sha contains an available $artifact artifact." >&2
+    exit 1
+fi
+echo "Downloading $artifact from https://github.com/$repo/actions/runs/$run"
+gh run download "$run" --repo "$repo" --name "$artifact" --dir "$workdir/wheels"
+python -m venv "$workdir/venv"
+python="$workdir/venv/bin/python"
+"$python" -m pip install -r python/tests/requirements.txt
+"$python" -m pip install --force-reinstall --find-links "$workdir/wheels" ctranslate2
+"$python" -I -c "import ctranslate2; print(ctranslate2.__file__); assert ctranslate2.get_cuda_device_count() > 0, 'No GPU available in the PR wheel; check drivers and runtime libraries'"
+if [[ -x tests/ctranslate2_test ]]; then
+    tests/ctranslate2_test tests/data
+else
+    echo "Skipping native tests: tests/ctranslate2_test is not built." >&2
+fi
+"$python" -I -m pytest -v python/tests/ --ignore=python/tests/test_fairseq.py --ignore=python/tests/test_opennmt_py.py --ignore=python/tests/test_opennmt_tf.py
+state=success