diff --git a/.github/workflows/build-pemja.yml b/.github/workflows/build-pemja.yml
new file mode 100644
index 00000000000..7bf8addb7ae
--- /dev/null
+++ b/.github/workflows/build-pemja.yml
@@ -0,0 +1,174 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the Linux-aarch64 job of
+# https://github.com/alibaba/pemja/blob/release-0.6.2/.github/workflows/build_wheels.yml
+# and on https://github.com/alibaba/pemja/blob/release-0.6.2/.github/workflows/java_tests.yml.
+name: Build pemja wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pemja.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pemja.yml'
+      - 'docs/packages/pemja.yaml'
+      - 'patches/pemja/**'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pemja.yml'
+      - 'docs/packages/pemja.yaml'
+      - 'patches/pemja/**'
+
+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
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: pemja
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build pemja ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    env:
+      PEMJA_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout pemja release-${{ env.PEMJA_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: alibaba/pemja
+          ref: release-${{ env.PEMJA_VERSION }}
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Patch pemja source
+        run: git apply python-wheels/patches/pemja/${{ env.PEMJA_VERSION }}/00*.patch
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Upstream builds against JDK 8; Rocky 10 only packages JDK 21.
+          CIBW_BEFORE_ALL_LINUX: dnf -y install java-21-openjdk-devel
+          CIBW_ENVIRONMENT_LINUX: JAVA_HOME=/usr/lib/jvm/java-21-openjdk
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pemja-${{ env.PEMJA_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  test_wheels:
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    name: Test pemja ${{ matrix.version }} on Python ${{ matrix.python-version }}
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        python-version: ['3.12', '3.13', '3.14', '3.14t']
+
+    env:
+      PEMJA_VERSION: ${{ matrix.version }}
+      # The JVM side loads the shared libpython, which manylinux's CPython lacks and uv's ships.
+      UV_PYTHON_PREFERENCE: only-managed
+
+    steps:
+      - name: Checkout pemja release-${{ env.PEMJA_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: alibaba/pemja
+          ref: release-${{ env.PEMJA_VERSION }}
+          persist-credentials: false
+
+      - name: Download wheels
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c  # v8.0.1
+        with:
+          pattern: pemja-${{ env.PEMJA_VERSION }}-*-manylinux_riscv64
+          path: dist
+          merge-multiple: true
+
+      - name: Install Python
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d  # v10.0.1
+        with:
+          python-version: ${{ matrix.python-version }}
+          activate-environment: true
+          enable-cache: false
+
+      # Temurin publishes no riscv64 JDK 11, upstream's test JDK.
+      - uses: actions/setup-java@b6effb05e454b25005698d916606bdc6ffcbf961  # v5.7.0
+        with:
+          distribution: temurin
+          java-version: '21'
+          architecture: riscv64
+
+      - name: Install Maven
+        run: |
+          sudo apt-get update -qq
+          sudo apt-get install -y -qq --no-install-recommends maven
+
+      - name: Install the wheel
+        run: uv pip install --only-binary pemja --find-links dist "pemja==${PEMJA_VERSION}"
+
+      # Upstream's Java tests load the extension from the source tree (`build_ext --inplace`).
+      - name: Stage the wheel's extension modules in the source tree
+        run: |
+          site_pemja=$(python -c 'import importlib.util; print(importlib.util.find_spec("pemja").submodule_search_locations[0])')
+          cp -v "${site_pemja}"/pemja_*.so src/main/python/pemja/
+
+      # google-java-format 1.7, which spotless runs first, does not work on JDK 21.
+      - name: Run upstream's Java tests
+        run: mvn -B test -Dspotless.skip=true
+
+  publish:
+    name: Publish pemja ${{ matrix.version }}
+    needs: [setup, build_wheels, test_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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pemja-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pemja.yaml b/docs/packages/pemja.yaml
new file mode 100644
index 00000000000..6b310affb8a
--- /dev/null
+++ b/docs/packages/pemja.yaml
@@ -0,0 +1,6 @@
+package-name: pemja
+source-code: https://github.com/alibaba/pemja
+license: Apache-2.0
+versions:
+- version: 0.6.2
+  patched: true
diff --git a/patches/pemja/0.6.2/0001-Drop-cpython-freethreading-from-the-cibuildwheel-ena.patch b/patches/pemja/0.6.2/0001-Drop-cpython-freethreading-from-the-cibuildwheel-ena.patch
new file mode 100644
index 00000000000..baaaf6abea2
--- /dev/null
+++ b/patches/pemja/0.6.2/0001-Drop-cpython-freethreading-from-the-cibuildwheel-ena.patch
@@ -0,0 +1,40 @@
+From 5e2fbce78ca16078733fa77dcfff6dec57c1a1b7 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Wed, 30 Sep 2026 17:45:34 +0000
+Subject: [PATCH] Drop cpython-freethreading from the cibuildwheel enable
+ groups
+
+cibuildwheel 3.0 removed the cpython-freethreading enable group -
+free-threaded builds are selected by the build identifier itself now,
+not an opt-in group - and its config parser rejects the value outright,
+before any container starts and for every interpreter in the matrix:
+
+  Failed to parse enable group. Unknown enable group:
+  cpython-freethreading. Valid group names are: cpython-prerelease,
+  graalpy, pypy, pypy-eol, pyodide-eol, pyodide-prerelease
+
+Upstream's build_wheels.yml pins pypa/cibuildwheel@v2.23.3, where the
+group is still valid and is what enables its cp313t wheels, so dropping
+it upstream would lose those wheels there.
+
+Upstream-Status: Inappropriate [needed only for cibuildwheel 3.0+, which python-wheels pins repo-wide; upstream pins v2.23.3]
+---
+ pyproject.toml | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/pyproject.toml b/pyproject.toml
+index 05da42c..ac0d260 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -6,7 +6,6 @@ requires = [
+ ]
+ 
+ [tool.cibuildwheel]
+-enable = ["cpython-freethreading"]
+ 
+ [tool.cibuildwheel.macos]
+ archs = "x86_64 arm64"
+\ No newline at end of file
+-- 
+2.43.0
+