diff --git a/.github/workflows/build-bcrypt.yml b/.github/workflows/build-bcrypt.yml
new file mode 100644
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+++ b/.github/workflows/build-bcrypt.yml
@@ -0,0 +1,172 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on upstream's wheel builder:
+#   https://github.com/pyca/bcrypt/blob/5.0.0/.github/workflows/wheel-builder.yml
+# bcrypt is a PyO3/Rust extension built with setuptools-rust (not maturin): abi3
+# is opt-in via a bdist_wheel flag, not a pyproject/Cargo feature - see build_abi3.
+name: Build bcrypt wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'bcrypt version to build (git tag, e.g. 5.0.0)'
+        required: true
+        default: '5.0.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-bcrypt.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '5.0.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # `inputs.version` is empty on pull_request events; default to 5.0.0 there.
+  BCRYPT_VERSION: ${{ inputs.version || '5.0.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+  # abi3 floor: cp312 is RISE's min Python, so the one wheel loads on >=3.12.
+  ABI3_FLOOR: cp312
+
+jobs:
+  # Build the sdist ourselves from the tag (never the prebuilt PyPI sdist); it's
+  # arch-independent, so build it once on x86 (gotcha 4).
+  build_sdist:
+    name: Build bcrypt ${{ inputs.version || '5.0.0' }} sdist
+    runs-on: ubuntu-latest
+    outputs:
+      sdist_name: ${{ steps.sdist.outputs.sdist_name }}
+      package_version: ${{ steps.sdist.outputs.package_version }}
+    steps:
+      - name: Checkout bcrypt ${{ env.BCRYPT_VERSION }}
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0  # v7.0.0
+        with:
+          repository: pyca/bcrypt
+          ref: ${{ env.BCRYPT_VERSION }}
+          persist-credentials: false
+
+      - name: Install Python
+        uses: astral-sh/setup-uv@fac544c07dec837d0ccb6301d7b5580bf5edae39  # v8.2.0
+        with:
+          python-version: '3.12'
+          activate-environment: true
+          enable-cache: false
+
+      - name: Build sdist
+        id: sdist
+        run: |
+          set -euo pipefail
+          rm -rf dist
+          uv pip install build twine
+          python -m build --sdist --outdir dist
+          twine check dist/*
+
+          sdist_name="$(ls dist)"
+          {
+            echo "sdist_name=${sdist_name}"
+            echo "package_version=$(echo "${sdist_name}" | sed -En 's/bcrypt-(.+)\.tar\.gz/\1/p')"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Upload sdist artifact
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: ${{ steps.sdist.outputs.sdist_name }}
+          path: dist/${{ steps.sdist.outputs.sdist_name }}
+          if-no-files-found: error
+
+  # One cp312-abi3 wheel: cibuildwheel builds it once and reuses+tests it on
+  # cp313/cp314 (find_compatible_wheel), so all three tags share one wheel.
+  build_abi3:
+    needs: [build_sdist]
+    name: Build bcrypt ${{ inputs.version || '5.0.0' }} cp312-abi3-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    steps:
+      - name: Download sdist
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: ${{ needs.build_sdist.outputs.sdist_name }}
+          path: dist/
+
+      - name: Build and test wheel
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: dist/${{ needs.build_sdist.outputs.sdist_name }}
+        env:
+          CIBW_ARCHS: riscv64
+          CIBW_BUILD: 'cp312-* cp313-* cp314-*'
+          CIBW_SKIP: '*-musllinux_*'  # rustup.rs has no riscv64 musl toolchain
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # setuptools-rust emits abi3 only when bdist_wheel gets --py-limited-api
+          # (cibuildwheel won't); without this it's per-interpreter wheels, not abi3.
+          CIBW_CONFIG_SETTINGS: --build-option=--py-limited-api=${{ env.ABI3_FLOOR }}
+          # No Rust in the manylinux image; install it and put cargo on PATH.
+          CIBW_BEFORE_ALL_LINUX: >-
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          CIBW_ENVIRONMENT: 'PATH="$PATH:$HOME/.cargo/bin"'
+          # Upstream's suite; {package} is the extracted sdist dir (gotcha 5).
+          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_COMMAND: pytest -q {package}/tests
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: bcrypt-${{ env.BCRYPT_VERSION }}-cp312-abi3-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  # Free-threaded wheel: per-interpreter, no abi3 (pyo3 disables abi3 under
+  # Py_GIL_DISABLED). Only cp314t - the riscv64 image has no cp313t interpreter.
+  build_freethreaded:
+    needs: [build_sdist]
+    name: Build bcrypt ${{ inputs.version || '5.0.0' }} cp314t-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    steps:
+      - name: Download sdist
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: ${{ needs.build_sdist.outputs.sdist_name }}
+          path: dist/
+
+      - name: Build and test wheel
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: dist/${{ needs.build_sdist.outputs.sdist_name }}
+        env:
+          CIBW_ARCHS: riscv64
+          CIBW_BUILD: 'cp314t-*'  # no --py-limited-api: abi3 has no free-threaded ABI
+          CIBW_SKIP: '*-musllinux_*'
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_BEFORE_ALL_LINUX: >-
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          CIBW_ENVIRONMENT: 'PATH="$PATH:$HOME/.cargo/bin"'
+          CIBW_TEST_REQUIRES: pytest
+          CIBW_TEST_COMMAND: pytest -q {package}/tests
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: bcrypt-${{ env.BCRYPT_VERSION }}-cp314t-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish bcrypt ${{ inputs.version || '5.0.0' }} to GitLab
+    needs: [build_sdist, build_abi3, build_freethreaded]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Publish wheels and open docs PR
+        uses: riseproject-dev/python-wheels/actions/publish-wheels@main
+        with:
+          artifact-pattern: bcrypt-${{ needs.build_sdist.outputs.package_version }}-*-manylinux_riscv64
+          gitlab-username: ${{ vars.GITLAB_DEPLOY_USER }}
+          gitlab-token: ${{ secrets.GITLAB_DEPLOY_TOKEN }}
+          gitlab-project-id: ${{ vars.GITLAB_PROJECT_ID }}
+          gh-token: ${{ secrets.GITHUB_TOKEN }}