diff --git a/.github/workflows/build-pynini.yml b/.github/workflows/build-pynini.yml
new file mode 100644
index 00000000000..9297b33ed6e
--- /dev/null
+++ b/.github/workflows/build-pynini.yml
@@ -0,0 +1,126 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+# Based on the wheel-building stage of
+# https://github.com/kylebgorman/pynini/blob/v2.1.7/third_party/Dockerfile
+name: Build pynini wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pynini.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pynini.yml'
+      - 'docs/packages/pynini.yaml'
+      - 'patches/pynini/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pynini.yml'
+      - 'docs/packages/pynini.yaml'
+      - 'patches/pynini/**'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+  OPENFST_VERSION: 1.8.4
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: pynini
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build pynini ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 180
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    env:
+      PYNINI_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout pynini v${{ env.PYNINI_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: kylebgorman/pynini
+          ref: v${{ env.PYNINI_VERSION }}
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Apply patches
+        run: git apply python-wheels/patches/pynini/${{ env.PYNINI_VERSION }}/*.patch
+
+      - uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # pynini links a system OpenFst rather than bundling it; build it the same
+          # way upstream's own manylinux Dockerfile does (third_party/Dockerfile).
+          CIBW_BEFORE_ALL_LINUX: |
+            set -eux
+            curl -fsSL -o /tmp/openfst.tar.gz "https://www.openfst.org/twiki/pub/FST/FstDownload/openfst-${{ env.OPENFST_VERSION }}.tar.gz"
+            tar -xzf /tmp/openfst.tar.gz -C /tmp
+            cd /tmp/openfst-${{ env.OPENFST_VERSION }}
+            ./configure --enable-grm
+            make -j"$(nproc)"
+            make install
+            ldconfig
+          CIBW_TEST_REQUIRES: absl-py
+          CIBW_TEST_COMMAND: >-
+            python -c "import pynini; print(pynini.__file__, pynini.__version__)" &&
+            python -c "import importlib.metadata as m; l = sorted(p.name for p in m.files('pynini') if '.dist-info/licenses/' in str(p)); assert l == ['AUTHORS', 'LICENSE', 'LICENSE.openfst'], l" &&
+            cd {project} &&
+            rc=0 &&
+            for t in tests/*_test.py; do
+            [ "$t" = tests/chatspeak_model_test.py ] || python "$t" || rc=1;
+            done;
+            exit $rc
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pynini-${{ env.PYNINI_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pynini ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pynini-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pynini.yaml b/docs/packages/pynini.yaml
new file mode 100644
index 00000000000..6eeb7cbf0e2
--- /dev/null
+++ b/docs/packages/pynini.yaml
@@ -0,0 +1,6 @@
+package-name: pynini
+source-code: https://github.com/kylebgorman/pynini
+license: Apache-2.0
+versions:
+- version: 2.1.7
+  patched: true
diff --git a/patches/pynini/2.1.7/0001-ship-OpenFst-s-licence-in-the-wheel-s-dist-info.patch b/patches/pynini/2.1.7/0001-ship-OpenFst-s-licence-in-the-wheel-s-dist-info.patch
new file mode 100644
index 00000000000..461fc6e9500
--- /dev/null
+++ b/patches/pynini/2.1.7/0001-ship-OpenFst-s-licence-in-the-wheel-s-dist-info.patch
@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Mon, 28 Sep 2026 07:47:21 +0000
+Subject: [PATCH] ship OpenFst's licence in the wheel's dist-info
+
+setup.py links a system OpenFst (fst, fstscript, fstfar, fstfarscript,
+fstmpdtscript, fstpdtscript) built separately -- this repo carries no
+OpenFst source of its own, and third_party/Dockerfile fetches, builds
+and installs it before building the wheel. auditwheel then bundles
+those shared libraries into pynini.libs/ inside the wheel, as verified
+against the real pynini-2.1.7-cp312-cp312-manylinux_2_27_x86_64.
+manylinux_2_28_x86_64.whl from PyPI (165 MB, ~440 MB of libfst*.so
+under pynini.libs/).
+
+setup.py declares no `license_files`, so setuptools' default
+LICEN[CS]E*/AUTHORS* root glob is what ships pynini's own LICENSE and
+AUTHORS; it never reaches OpenFst's COPYING (Apache-2.0), which only
+exists in the OpenFst tarball fetched at build time and is not part of
+this checkout. Reproduced against that same real wheel: dist-info/
+licenses/ carries only AUTHORS and LICENSE.
+
+Restoring OpenFst 1.8.4's COPYING text unchanged as LICENSE.openfst at
+the project root is picked up by that same default glob with no
+packaging change, landing it in dist-info/licenses/ alongside pynini's
+own LICENSE and AUTHORS.
+
+Upstream-Status: To upstream [no fork of kylebgorman/pynini to push from]
+
+Signed-off-by: Ludovic Henry <git@ludovic.dev>
+---
+ LICENSE.openfst | 13 +++++++++++++
+ 1 file changed, 13 insertions(+)
+ create mode 100644 LICENSE.openfst
+
+diff --git a/LICENSE.openfst b/LICENSE.openfst
+new file mode 100644
+index 0000000..511ac14
+--- /dev/null
++++ b/LICENSE.openfst
+@@ -0,0 +1,13 @@
++Licensed under the Apache License, Version 2.0 (the "License");
++you may not use these files except in compliance with the License.
++You may obtain a copy of the License at
++
++    http://www.apache.org/licenses/LICENSE-2.0
++
++Unless required by applicable law or agreed to in writing, software
++distributed under the License is distributed on an "AS IS" BASIS,
++WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++See the License for the specific language governing permissions and
++limitations under the License.
++
++Copyright 2005-2024 Google LLC.