diff --git a/.github/workflows/build-zuban.yml b/.github/workflows/build-zuban.yml
new file mode 100644
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+++ b/.github/workflows/build-zuban.yml
@@ -0,0 +1,156 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `build` job of
+# https://github.com/zubanls/zuban/blob/v0.9.3/.github/workflows/wheels.yml
+name: Build zuban wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'zuban version to build (git tag without the leading v, e.g. 0.9.3)'
+        required: true
+        default: '0.9.3'
+  pull_request:
+    paths:
+      - '.github/workflows/build-zuban.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.9.3' }}-${{ 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 0.9.3 there.
+  ZUBAN_VERSION: ${{ inputs.version || '0.9.3' }}
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheel:
+    needs: [setup]
+    name: Build zuban ${{ inputs.version || '0.9.3' }} manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 360
+
+    steps:
+      - name: Checkout zuban v${{ env.ZUBAN_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: zubanls/zuban
+          ref: v${{ env.ZUBAN_VERSION }}
+          submodules: recursive
+          persist-credentials: false
+
+      # `[tool.maturin] license-files = ["licenses.html"]` in
+      # deploy/pypi/zuban/pyproject.toml requires this file to exist before
+      # maturin builds; upstream's own pre-maturin-build.sh generates it the
+      # same way. The riscv64 runner ships no Rust toolchain (unlike
+      # upstream's GitHub-hosted runners), so install one first.
+      - uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772  # master
+        with:
+          toolchain: stable
+
+      - name: Generate third-party licenses.html
+        working-directory: deploy/pypi/zuban
+        run: |
+          cargo install --features cli --locked --debug cargo-about --version 0.9.0
+          cargo about generate -o licenses.html about.hbs --fail --manifest-path ../../../Cargo.toml
+
+      - name: Build wheel
+        uses: PyO3/maturin-action@e83996d129638aa358a18fbd1dfb82f0b0fb5d3b  # v1.51.0
+        with:
+          command: build
+          target: riscv64gc-unknown-linux-gnu
+          working-directory: deploy/pypi/zuban
+          args: --release --locked --out dist --ignore-rust-version
+          manylinux: '2_39'
+          before-script-linux: git config --global --add safe.directory "*"
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: zuban-${{ env.ZUBAN_VERSION }}-manylinux_riscv64
+          path: deploy/pypi/zuban/dist/*.whl
+          if-no-files-found: error
+
+  test_wheel:
+    name: Test zuban ${{ inputs.version || '0.9.3' }} on Python ${{ matrix.python-version }}
+    needs: [setup, build_wheel]
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 30
+    env:
+      # Without this uv would reuse the runner image's system CPython for 3.12
+      # and download a standalone build for the others.
+      UV_PYTHON_PREFERENCE: only-managed
+    strategy:
+      fail-fast: false
+      matrix:
+        # This repo's default interpreter matrix (gotcha in workflow-anatomy.md);
+        # the wheel is interpreter-agnostic (bindings = "bin"), so every
+        # interpreter -- including free-threaded -- exercises the same binary.
+        python-version: ['3.12', '3.13', '3.14', '3.14t']
+
+    steps:
+      - name: Download wheel
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          name: zuban-${{ env.ZUBAN_VERSION }}-manylinux_riscv64
+
+      - name: Install Python
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d  # v10.0.1
+        with:
+          python-version: ${{ matrix.python-version }}
+          activate-environment: true
+          enable-cache: false
+
+      - name: Install wheel
+        run: uv pip install --reinstall --no-index --find-links . zuban
+
+      # No `python -m zuban` (gotcha 224): zuban/__init__.py deliberately
+      # raises, so only the installed console scripts are usable. `zuban
+      # check` exercises the bundled typeshed stubs (submodule checkout), not
+      # just process startup; `zmypy` execs `zuban mypy` via a sibling-path
+      # lookup, so it also proves both console scripts installed together.
+      - name: Test wheel
+        run: |
+          set -euo pipefail
+          zuban --help >/dev/null
+          zmypy --version
+
+          work=$(mktemp -d)
+          cat > "$work/bad.py" <<'PY'
+          def add(a: int, b: int) -> int:
+              return a + b
+
+          add("1", "2")
+          PY
+
+          set +e
+          out=$(zuban check "$work/bad.py" 2>&1)
+          rc=$?
+          set -e
+          echo "$out"
+          [ "$rc" -ne 0 ]
+          echo "$out" | grep -qi 'error'
+
+          cat > "$work/good.py" <<'PY'
+          def add(a: int, b: int) -> int:
+              return a + b
+
+          add(1, 2)
+          PY
+          zuban check "$work/good.py"
+
+  publish:
+    name: Publish zuban ${{ inputs.version || '0.9.3' }}
+    needs: [setup, build_wheel, test_wheel]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: zuban-${{ inputs.version || '0.9.3' }}-manylinux_riscv64