diff --git a/.github/workflows/build-praat-parselmouth.yml b/.github/workflows/build-praat-parselmouth.yml
new file mode 100644
index 000000000..207b29791
--- /dev/null
+++ b/.github/workflows/build-praat-parselmouth.yml
@@ -0,0 +1,107 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `wheels` job of upstream's own cibuildwheel config:
+# https://github.com/YannickJadoul/Parselmouth/blob/v0.4.7/.github/workflows/wheels.yml
+name: Build praat-parselmouth wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'praat-parselmouth version to build (git tag without leading v, e.g. 0.4.7)'
+        required: true
+        default: '0.4.7'
+  pull_request:
+    paths:
+      - '.github/workflows/build-praat-parselmouth.yml'
+      - 'patches/praat-parselmouth/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.4.7' }}-${{ 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 0.4.7 there.
+  PARSELMOUTH_VERSION: ${{ inputs.version || '0.4.7' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build praat-parselmouth ${{ inputs.version || '0.4.7' }} cp312/cp313/cp314-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 480  # ~1M lines of vendored Praat C/C++ (clapack, gsl, glpk, flac, portaudio, espeak, vorbis, opusfile)
+
+    steps:
+      - name: Checkout Parselmouth v${{ env.PARSELMOUTH_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: YannickJadoul/Parselmouth
+          ref: v${{ env.PARSELMOUTH_VERSION }}
+          # praat/ and pybind11/ are vendored directly; only extern/fmt is a real submodule.
+          submodules: recursive
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Patch praat-parselmouth source
+        run: git apply python-wheels/patches/praat-parselmouth/${{ env.PARSELMOUTH_VERSION }}/*.patch
+
+      - name: Pin cmake build dependency
+        # Mirrors upstream's own CI (which rewrites pyproject.toml the same way at
+        # build time): cmake 4 dropped compatibility with cmake_minimum_required
+        # versions below 3.5, which the vendored pybind11 (3.5) and fmt (3.1...3.18)
+        # CMakeLists.txt rely on.
+        run: sed -i 's/"cmake>=3.18"/"cmake>=3.18,<4"/' pyproject.toml
+
+      - name: Build and test wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+        env:
+          CIBW_ARCHS: riscv64
+          CIBW_BUILD: cp312-manylinux_riscv64 cp313-manylinux_riscv64 cp314-manylinux_riscv64
+          # No musllinux riscv64 numpy wheel on the registry yet (workflow-anatomy.md).
+          CIBW_SKIP: "*musllinux*"
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Builds the heavy vendored `praat` static lib once for the whole job
+          # instead of once per interpreter (gotcha 15), exactly like upstream's
+          # own CIBW_BEFORE_ALL.
+          CIBW_BEFORE_ALL_LINUX: |
+            cmake -S . -B build_dependencies
+            cmake --build build_dependencies --target praat -j "$(nproc)"
+          CIBW_BEFORE_BUILD: rm -rf _skbuild
+          CIBW_ENVIRONMENT: >-
+            PARSELMOUTH_EXTRA_CMAKE_ARGS="-DPREBUILT_DEPENDENCIES=$(pwd)/build_dependencies"
+            CMAKE_BUILD_PARALLEL_LEVEL=4
+            PIP_ONLY_BINARY=numpy,cmake
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_REQUIRES: "pytest<8 pytest-lazy-fixture tgt future"
+          CIBW_TEST_COMMAND: pytest {project}/tests
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: praat-parselmouth-${{ env.PARSELMOUTH_VERSION }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish praat-parselmouth ${{ inputs.version || '0.4.7' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: praat-parselmouth-${{ inputs.version || '0.4.7' }}-manylinux_riscv64
diff --git a/patches/praat-parselmouth/0.4.7/0001-test-tolerate-FP-rounding-differences-in-test_xs-s-g.patch b/patches/praat-parselmouth/0.4.7/0001-test-tolerate-FP-rounding-differences-in-test_xs-s-g.patch
new file mode 100644
index 000000000..bb1656823
--- /dev/null
+++ b/patches/praat-parselmouth/0.4.7/0001-test-tolerate-FP-rounding-differences-in-test_xs-s-g.patch
@@ -0,0 +1,44 @@
+From fe441a9a966150645b0ec88f0bc62b7c22f4b797 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Fri, 11 Sep 2026 12:13:56 +0200
+Subject: [PATCH] test: tolerate FP rounding differences in test_xs's
+ grid-formula recomputation
+
+Upstream-Status: To upstream [not submitted; this port's automation may not open issues or PRs on repos other than riseproject-dev/python-wheels]
+
+test_xs re-derives each Sampled's x grid in Python (x1 + dx * arange(nx))
+and compares it to the C++-computed xs()/x_grid()/x_bins() with strict
+floating-point equality. On riscv64 the two independently-computed
+expressions differ in their last bit or two (compiler FMA fusion
+differences between GCC's riscv64 codegen and numpy's separate
+multiply-then-add), so the exact-equality assert fails even though the
+values agree to machine precision. Reproduces on riscv64 only; not seen
+on the x86_64/aarch64/arm64/windows runners upstream's own CI covers.
+
+Switch the three assertions to np.allclose with a tolerance far above
+double-precision rounding error but far below any real functional
+divergence.
+---
+ tests/test_sampled.py | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/tests/test_sampled.py b/tests/test_sampled.py
+index fc4c141..7b7cc93 100644
+--- a/tests/test_sampled.py
++++ b/tests/test_sampled.py
+@@ -21,9 +21,9 @@ import numpy as np
+ 
+ 
+ def test_xs(sampled):
+-	assert np.all(sampled.xs() == sampled.x1 + sampled.dx * np.arange(sampled.nx))
+-	assert np.all(sampled.x_grid() == sampled.x1 + sampled.dx * (np.arange(sampled.nx + 1) - 0.5))
+-	assert np.all(sampled.x_bins() == np.vstack((sampled.x_grid()[:-1], sampled.x_grid()[1:])).T)
++	assert np.allclose(sampled.xs(), sampled.x1 + sampled.dx * np.arange(sampled.nx), rtol=1e-9, atol=1e-12)
++	assert np.allclose(sampled.x_grid(), sampled.x1 + sampled.dx * (np.arange(sampled.nx + 1) - 0.5), rtol=1e-9, atol=1e-12)
++	assert np.allclose(sampled.x_bins(), np.vstack((sampled.x_grid()[:-1], sampled.x_grid()[1:])).T, rtol=1e-9, atol=1e-12)
+ 
+ 
+ def test_len(sampled):
+-- 
+2.50.1 (Apple Git-155)
+