diff --git a/.github/workflows/build-cronexpr.yml b/.github/workflows/build-cronexpr.yml
new file mode 100644
index 000000000..73691b0f7
--- /dev/null
+++ b/.github/workflows/build-cronexpr.yml
@@ -0,0 +1,88 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `build_wheels` job of
+# https://github.com/CodyRay/pycronexpr/blob/v0.30.0/.github/workflows/deploy.yaml
+name: Build cronexpr wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'cronexpr version to build (git tag without leading v, e.g. 0.30.0)'
+        required: true
+        default: '0.30.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-cronexpr.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.30.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  # `inputs.version` is empty on pull_request events; default to 0.30.0 there.
+  CRONEXPR_VERSION: ${{ inputs.version || '0.30.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build cronexpr ${{ inputs.version || '0.30.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 60
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ["cp312", "cp313", "cp314", "cp314t"]
+
+    steps:
+      - name: Checkout pycronexpr v${{ env.CRONEXPR_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: CodyRay/pycronexpr
+          ref: v${{ env.CRONEXPR_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: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # scikit-build-core fetches cmake/ninja from PyPI when missing on PATH, and CMake
+          # 4+ rejects supertinycron's CPM-fetched cmake_minimum_required(3.5) (gotcha 257).
+          CIBW_ENVIRONMENT: >-
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+            CMAKE_POLICY_VERSION_MINIMUM=3.5
+          CIBW_TEST_COMMAND: >-
+            python -c "import _ccronexpr as m; assert m.__file__.endswith('.so'), m.__file__" &&
+            python -c "import cronexpr, unittest;
+            from datetime import datetime, timezone;
+            d = datetime(2024, 9, 4, tzinfo=timezone.utc);
+            assert cronexpr.next_fire('0 0 21 ? 1/2 TUE#1 *', d) == datetime(2024, 11, 5, 21, 0, tzinfo=timezone.utc);
+            assert cronexpr.prev_fire('0 0 21 ? 1/2 TUE#1 *', d) == datetime(2024, 9, 3, 21, 0, tzinfo=timezone.utc);
+            unittest.TestCase().assertRaises(ValueError, cronexpr.prev_fire, '* 35 * * *')"
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: cronexpr-${{ env.CRONEXPR_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish cronexpr ${{ inputs.version || '0.30.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: cronexpr-${{ inputs.version || '0.30.0' }}-*-manylinux_riscv64