diff --git a/.github/workflows/build-pendulum.yml b/.github/workflows/build-pendulum.yml
new file mode 100644
index 000000000000..a20580290d40
--- /dev/null
+++ b/.github/workflows/build-pendulum.yml
@@ -0,0 +1,145 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `Tests` job of
+# https://github.com/python-pendulum/pendulum/blob/3.3.0/.github/workflows/tests.yml
+name: Build pendulum wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/pendulum.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pendulum.yml'
+      - 'docs/packages/pendulum.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-pendulum.yml'
+      - 'docs/packages/pendulum.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: pendulum
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    name: Build pendulum ${{ 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) }}
+        # pendulum's pyo3 dependency has a plain `features =
+        # ["pyo3/extension-module"]` (no abi3-pyNN), so every interpreter
+        # needs its own build. pypy3.11 (upstream also builds it) is
+        # dropped: PyPy has no riscv64 port. Upstream's own tests.yml only
+        # exercises free-threading on 3.14t/3.15t, not 3.13t. cp310/cp311 are
+        # dropped too: time-machine, one of upstream's own test dependencies,
+        # is only published for cp312+ on our registry and has no riscv64
+        # wheel on public PyPI either, so a cp310/cp311 wheel couldn't be
+        # tested against upstream's real suite (same trim as
+        # build-neo4j-rust-ext.yml's pyarrow note).
+        python: ['cp312', 'cp313', 'cp314', 'cp314t']
+
+    env:
+      PENDULUM_VERSION: ${{ matrix.version }}
+      # Without this uv would reuse the runner image's system CPython for
+      # some interpreters and download a standalone build for the others.
+      UV_PYTHON_PREFERENCE: only-managed
+
+    steps:
+      - name: Checkout pendulum v${{ env.PENDULUM_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: python-pendulum/pendulum
+          ref: ${{ env.PENDULUM_VERSION }}
+          persist-credentials: false
+
+      - name: Determine target interpreter
+        id: interp
+        run: |
+          v="${{ matrix.python }}"
+          v="${v#cp}"
+          t="${v%t}"
+          suffix=""
+          if [ "$t" != "$v" ]; then
+            suffix="t"
+          fi
+          echo "value=python${t:0:1}.${t:1}${suffix}" >> "$GITHUB_OUTPUT"
+
+      - name: Build wheel
+        uses: PyO3/maturin-action@e83996d129638aa358a18fbd1dfb82f0b0fb5d3b  # v1.51.0
+        with:
+          target: riscv64gc-unknown-linux-gnu
+          args: --release --strip -i ${{ steps.interp.outputs.value }} --out dist
+          manylinux: '2_39'
+
+      - name: Install Python
+        uses: astral-sh/setup-uv@20cfd1bf945f4377ade1205e4dbc17946fc9a30d  # v10.0.1
+        with:
+          python-version: ${{ steps.interp.outputs.value }}
+          activate-environment: true
+          enable-cache: false
+
+      # Mirrors upstream's own "Tests" job (tests.yml): install the runtime
+      # and test dependencies it declares, then run its own test suite
+      # unmodified, once against the just-built wheel and once (as upstream
+      # also does) with the native extension disabled.
+      - name: Install test dependencies
+        env:
+          UV_EXTRA_INDEX_URL: https://pypi.riseproject.dev/simple/
+        run: |
+          # --no-deps: --no-index disables index lookups entirely, including for
+          # pendulum's own runtime deps (python-dateutil, tzdata), which dist/
+          # doesn't carry. They're installed explicitly below instead.
+          # python-dateutil pinned to upstream's poetry.lock: 3.0's tz.gettz()
+          # objects gain a .key, which breaks test_instance_with_aware_datetime_any_tzinfo.
+          uv pip install pendulum --no-index --find-links dist --force-reinstall --no-deps
+          uv pip install 'python-dateutil==2.9.0.post0' 'tzdata>=2020.1' 'pytest>=9.0.3' 'pytest-benchmark>=4.0.0,<5.0.0' 'time-machine>=3.0.0,<4.0.0'
+
+      - name: Test Pure Python
+        run: PENDULUM_EXTENSIONS=0 pytest -q tests
+
+      - name: Test
+        run: pytest -q tests
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: pendulum-${{ env.PENDULUM_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: dist/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish pendulum ${{ 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: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: pendulum-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/pendulum.yaml b/docs/packages/pendulum.yaml
new file mode 100644
index 000000000000..c428cc05d062
--- /dev/null
+++ b/docs/packages/pendulum.yaml
@@ -0,0 +1,5 @@
+package-name: pendulum
+source-code: https://github.com/python-pendulum/pendulum
+license: MIT License
+versions:
+- version: 3.3.0