diff --git a/.github/workflows/build-faust-cchardet.yml b/.github/workflows/build-faust-cchardet.yml
new file mode 100644
index 000000000..d024ce0a2
--- /dev/null
+++ b/.github/workflows/build-faust-cchardet.yml
@@ -0,0 +1,99 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on the `build_wheels` job of
+# https://github.com/faust-streaming/cChardet/blob/v3.2.0/.github/workflows/build-and-upload-to-pypi.yml
+name: Build faust-cchardet wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'faust-cchardet version to build (e.g. 3.2.0)'
+        required: true
+        default: '3.2.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-faust-cchardet.yml'
+      - 'patches/faust-cchardet/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '3.2.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  FAUST_CCHARDET_VERSION: ${{ inputs.version || '3.2.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build faust-cchardet ${{ inputs.version || '3.2.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 90
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout cChardet v${{ env.FAUST_CCHARDET_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: faust-streaming/cChardet
+          ref: v${{ env.FAUST_CCHARDET_VERSION }}
+          submodules: recursive
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      # pyproject.toml declares `license` but no `license-files`, and
+      # meson-python's build backend has no default COPYING/LICENSE glob, so
+      # every wheel upstream publishes ships with none. See
+      # patches/faust-cchardet/3.2.0 for details.
+      - name: Patch cChardet source
+        run: git apply python-wheels/patches/faust-cchardet/${{ env.FAUST_CCHARDET_VERSION }}/*.patch
+
+      - name: Build and test wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+
+      - name: Verify the wheel ships the compiled extension and licence
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          for whl in sys.argv[1:]:
+              names = zipfile.ZipFile(whl).namelist()
+              assert any(n.startswith("cchardet/_cchardet") and n.endswith(".so") for n in names), names
+              assert any(n.endswith(".dist-info/licenses/COPYING") for n in names), names
+              print(whl, "ok")
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: faust-cchardet-${{ env.FAUST_CCHARDET_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish faust-cchardet ${{ inputs.version || '3.2.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: faust-cchardet-${{ inputs.version || '3.2.0' }}-*-manylinux_riscv64
diff --git a/patches/faust-cchardet/3.2.0/0001-ship-the-tri-license-COPYING-in-the-wheel-s-dist-info.patch b/patches/faust-cchardet/3.2.0/0001-ship-the-tri-license-COPYING-in-the-wheel-s-dist-info.patch
new file mode 100644
index 000000000..3888d2529
--- /dev/null
+++ b/patches/faust-cchardet/3.2.0/0001-ship-the-tri-license-COPYING-in-the-wheel-s-dist-info.patch
@@ -0,0 +1,46 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Thu, 10 Sep 2026 07:43:01 +0200
+Subject: [PATCH] ship the MPL-1.1/GPL-2.0-or-later/LGPL-2.1-or-later COPYING
+ in the wheel's dist-info
+
+pyproject.toml declares the tri-license as a legacy `license = { text = ... }`
+table, which two things break:
+
+- meson-python's build backend has no default LICEN[CS]E*/COPYING* glob
+  (pyproject-metadata only ever includes files named in `license-files`),
+  so every wheel upstream publishes (verified against the real
+  faust_cchardet-3.2.0-cp312-cp312-manylinux_2_24_x86_64.manylinux_2_28_x86_64.whl
+  from PyPI) carries no licence file at all.
+- pyproject-metadata refuses `license-files` outright unless `license` is
+  itself a PEP 639 SPDX expression string, not the old table form:
+  "project.license-files" must not be used when "project.license" is not
+  a SPDX license expression.
+
+The fix is two coupled edits: turn `license` into the plain SPDX string
+(the text was already valid SPDX, just wrapped in the deprecated table),
+and add `license-files = ["COPYING"]`. meson-python then copies the
+repository's root COPYING into dist-info/licenses/COPYING. The vendored
+uchardet submodule under src/ext/uchardet ships its own COPYING that is
+byte-identical to the root one (both are the MPL 1.1 text uchardet itself
+is tri-licensed under), so one file covers both.
+
+Upstream-Status: To upstream [not yet submitted; no fork of faust-streaming/cChardet to push from]
+---
+ pyproject.toml | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/pyproject.toml b/pyproject.toml
+index 3f750f9..6d910a9 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -18,7 +18,8 @@ name = "faust-cchardet"
+ description = "cChardet is high speed universal character encoding detector."
+ readme = "README.md"
+ authors = [{ name = "PyYoshi", email = "myoshi321go@gmail.com" }]
+-license = { text = "MPL-1.1 OR GPL-2.0-or-later OR LGPL-2.1-or-later" }
++license = "MPL-1.1 OR GPL-2.0-or-later OR LGPL-2.1-or-later"
++license-files = ["COPYING"]
+ keywords = ["cython", "chardet", "charsetdetect"]
+ # meson-python (the build backend) requires Python >= 3.8. Python 3.9 is no
+ # longer supported; the floor is 3.10.