diff --git a/.github/workflows/build-pyjpt.yml b/.github/workflows/build-pyjpt.yml
new file mode 100644
index 000000000000..8e44a9c8c4aa
--- /dev/null
+++ b/.github/workflows/build-pyjpt.yml
@@ -0,0 +1,127 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on: https://github.com/joint-probability-trees/jpt-dev/blob/1.3.4/.github/workflows/reusable-test-and-build.yml
+name: Build pyjpt wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pyjpt.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pyjpt.yml'
+      - 'docs/packages/pyjpt.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pyjpt.yml'
+      - 'docs/packages/pyjpt.yaml'
+
+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: pyjpt
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build pyjpt ${{ matrix.version }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 120
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+        # No cp314t: our registry has no free-threaded pandas wheel.
+        # No cp314: dnutils (a runtime dependency, every released version) imports
+        # _thread._set_sentinel, removed in Python 3.14, so pyjpt fails to import
+        # on cp314 regardless of architecture.
+        python: ["cp312", "cp313"]
+
+    env:
+      PYJPT_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout pyjpt ${{ env.PYJPT_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: joint-probability-trees/jpt-dev
+          ref: ${{ env.PYJPT_VERSION }}
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          output-dir: wheelhouse/
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # Cython 3.3.0 shipped after this release and rejects the .pyx/.pxd
+          # signature pairs in jpt.base.intervals; build-system.requires only floors it.
+          CIBW_BEFORE_ALL: echo 'Cython<3.3.0' > /cython-constraint.txt
+          CIBW_ENVIRONMENT: >-
+            PIP_CONSTRAINT=/cython-constraint.txt
+            PIP_BUILD_CONSTRAINT=/cython-constraint.txt
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            PIP_ONLY_BINARY=numpy,scipy,pandas,scikit-learn,matplotlib,contourpy,kiwisolver,pillow
+            SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYJPT=${{ env.PYJPT_VERSION }}
+          CIBW_BEFORE_TEST_LINUX: dnf -y install graphviz
+          CIBW_TEST_SOURCES: tests examples
+          # The dev extra minus docs/jupyter/mlflow/kaleido; mlflow is what holds
+          # upstream's pandas below 3, whose str dtype infer_from_dataframe rejects.
+          CIBW_TEST_EXTRAS: matplotlib,seq
+          CIBW_TEST_REQUIRES: pytest ddt scikit-learn plotly pandas<3
+          # The deselected tests export plotly figures, which needs kaleido (no riscv64 build).
+          # The --deselect tests fail only on riscv64, at or near the last few ULP of a
+          # double (e.g. test_conditional_jpt: 0.9999999999999999 != 1.0; test_conditioning:
+          # 1.0000000000000373 != 1), from vectorized FMA/accumulation order differing across
+          # architectures - not a pyjpt bug, and the asserts are Python == rather than approx.
+          CIBW_TEST_COMMAND: >-
+            python -c "import jpt.base.intervals.base as m; assert m.__file__.endswith('.so'), m.__file__" &&
+            python -m pytest tests/test -p no:cacheprovider
+            -k "not plotly and not test_pdf_grid_3_None and not test_abalone
+            and not test_gaussians and not test_restaurant and not test_tourism"
+            --deselect tests/test/base/functions/test_piecewise.py::PLFTest::test_xshift
+            --deselect tests/test/distributions/qpd/test_quantiles.py::FitInvariantTest::test_fit_extreme_magnitudes
+            --deselect tests/test/test_trees.py::JPTTest::test_conditional_jpt
+            --deselect tests/test/test_trees.py::TestGaussianConditionalJPT::test_conditioning
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pyjpt-${{ env.PYJPT_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pyjpt ${{ 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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pyjpt-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pyjpt.yaml b/docs/packages/pyjpt.yaml
new file mode 100644
index 000000000000..fbe84688cada
--- /dev/null
+++ b/docs/packages/pyjpt.yaml
@@ -0,0 +1,5 @@
+package-name: pyjpt
+source-code: https://github.com/joint-probability-trees/jpt-dev
+license: Unknown
+versions:
+- version: 1.3.4