diff --git a/.github/workflows/build-edt.yml b/.github/workflows/build-edt.yml
new file mode 100644
index 000000000..a8f477fd5
--- /dev/null
+++ b/.github/workflows/build-edt.yml
@@ -0,0 +1,105 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on: https://github.com/seung-lab/euclidean-distance-transform-3d/blob/3.1.2/.github/workflows/build_wheels.yml
+name: Build edt wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'edt version to build (git tag, e.g. 3.1.2)'
+        required: true
+        default: '3.1.2'
+  pull_request:
+    paths:
+      - '.github/workflows/build-edt.yml'
+      - 'patches/edt/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '3.1.2' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  EDT_VERSION: ${{ inputs.version || '3.1.2' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build edt ${{ inputs.version || '3.1.2' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout edt ${{ env.EDT_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: seung-lab/euclidean-distance-transform-3d
+          ref: ${{ env.EDT_VERSION }}
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Apply patches
+        run: git apply python-wheels/patches/edt/${{ env.EDT_VERSION }}/*.patch
+
+      - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # numpy is a build-time requirement (headers, via pyproject.toml's
+          # build-system.requires) and, despite not being declared as a
+          # runtime dependency by name, an implicit one too (the compiled
+          # extension calls numpy's C API at import time). Only our registry
+          # has it for riscv64; only-binary keeps a newer PyPI release from
+          # winning the resolution and then compiling from sdist.
+          CIBW_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=numpy
+          CIBW_TEST_REQUIRES: pytest numpy scipy
+          CIBW_TEST_COMMAND: python -m pytest -v {project}/automated_test.py
+
+      - name: Check wheel contents
+        run: |
+          python3 - wheelhouse/*.whl <<'EOF'
+          import sys, zipfile
+          names = zipfile.ZipFile(sys.argv[1]).namelist()
+          exts = {n.split("/")[-1].split(".")[0] for n in names if n.endswith(".so")}
+          assert exts == {"edt"}, exts
+          licences = {n.rsplit("/", 1)[-1] for n in names if ".dist-info/licenses/" in n} - {""}
+          assert licences == {"COPYING", "COPYING.LESSER"}, licences
+          EOF
+
+      - name: Store wheels
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: edt-${{ env.EDT_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: ./wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish edt ${{ inputs.version || '3.1.2' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: edt-${{ inputs.version || '3.1.2' }}-*-manylinux_riscv64
diff --git a/patches/edt/3.1.2/0001-Ship-the-LGPL-license-files-in-the-wheel.patch b/patches/edt/3.1.2/0001-Ship-the-LGPL-license-files-in-the-wheel.patch
new file mode 100644
index 000000000..04c05d790
--- /dev/null
+++ b/patches/edt/3.1.2/0001-Ship-the-LGPL-license-files-in-the-wheel.patch
@@ -0,0 +1,39 @@
+From 28d7662d54333ee225c4567fb26a22f7608a8479 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Mon, 7 Sep 2026 16:03:48 +0200
+Subject: [PATCH] Ship the LGPL license files in the wheel
+
+setup.cfg names license_files = LICENSE, but the project has no LICENSE
+file at the root -- only COPYING (GPLv3 text) and COPYING.LESSER (the
+LGPLv3 addendum, per the standard GNU dual-file convention). An explicit
+license_files list turns off setuptools' default LICEN[CS]E*/COPYING*
+glob, so the mismatch means every published wheel (verified on PyPI's
+edt-3.1.2 manylinux wheels) ships no license file at all in
+dist-info/licenses/.
+
+Point license_files at the files that actually exist so the wheel
+carries the LGPL-3.0-or-later text it declares.
+
+Upstream-Status: To upstream [not yet submitted; same gap exists in every edt wheel on PyPI historically, needs maintainer discussion not a drive-by PR]
+---
+ setup.cfg | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/setup.cfg b/setup.cfg
+index 43efb4b..464890d 100644
+--- a/setup.cfg
++++ b/setup.cfg
+@@ -7,7 +7,9 @@ description_file = README.md
+ author = William Silversmith
+ author_email = ws9@princeton.edu
+ home_page = https://github.com/seung-lab/euclidean-distance-transform-3d/
+-license_files = LICENSE
++license_files =
++    COPYING
++    COPYING.LESSER
+ license = LGPL-3.0-or-later
+ classifier =
+     Intended Audience :: Developers
+-- 
+2.50.1 (Apple Git-155)
+