diff --git a/.github/workflows/build-semantic-text-splitter.yml b/.github/workflows/build-semantic-text-splitter.yml
new file mode 100644
index 000000000..066c2cb33
--- /dev/null
+++ b/.github/workflows/build-semantic-text-splitter.yml
@@ -0,0 +1,130 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# This workflow is based on the `linux` job of
+# https://github.com/benbrandt/text-splitter/blob/v0.32.0/.github/workflows/python.yml
+name: Build semantic-text-splitter wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'semantic-text-splitter version to build (git tag without leading v, e.g. 0.32.0)'
+        required: true
+        default: '0.32.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-semantic-text-splitter.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '0.32.0' }}-${{ 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 0.32.0 there.
+  SEMANTIC_TEXT_SPLITTER_VERSION: ${{ inputs.version || '0.32.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build semantic-text-splitter ${{ inputs.version || '0.32.0' }} ${{ matrix.tag }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 120
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # bindings/python/Cargo.toml's `abi3` feature (pyo3/abi3-py310) is on
+          # by default, so one abi3 wheel serves every GIL-ful interpreter;
+          # pyo3 disables abi3 under Py_GIL_DISABLED, giving the free-threaded
+          # build its own wheel (upstream's own python.yml does the same, via
+          # a separate `-i python3.14t` maturin-action step). The `abi3t`
+          # feature (pyo3/abi3t-py315) targets an unreleased CPython and is
+          # out of scope for this repo's floor.
+          - tag: cp310-abi3
+            # Built on cp310 -- the oldest interpreter the abi3 tag claims --
+            # and re-tested on the newer ones via find_compatible_wheel.
+            build: >-
+              cp310-manylinux_riscv64 cp311-manylinux_riscv64
+              cp312-manylinux_riscv64 cp313-manylinux_riscv64
+              cp314-manylinux_riscv64
+            test-requires: pytest tokenizers tree-sitter-python
+            test-command: cd bindings/python && python -m pytest -v tests
+          - tag: cp314t
+            build: cp314t-manylinux_riscv64
+            test-requires: pytest tokenizers
+            # tree-sitter-python ships no cp314t wheel anywhere upstream (only
+            # cp310-abi3), and its sdist is missing src/scanner.c (present in
+            # its git tag, so this reproduces on any arch, not just riscv64) --
+            # building it here fails at import with "undefined symbol:
+            # tree_sitter_python_external_scanner_create". test_integration.py
+            # imports it at module scope, so the whole suite is uncollectable
+            # on this interpreter (gotcha 149's shape); the compiled-extension
+            # assertion below is the only check this leg gets.
+            test-command: 'true'
+
+    steps:
+      - name: Checkout text-splitter ${{ env.SEMANTIC_TEXT_SPLITTER_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: benbrandt/text-splitter
+          ref: v${{ env.SEMANTIC_TEXT_SPLITTER_VERSION }}
+          persist-credentials: false
+
+      - name: Stage the licence beside semantic-text-splitter's pyproject.toml
+        # maturin globs LICEN[CS]E* relative to the pyproject directory, which
+        # is bindings/python/ in this workspace -- the licence file lives at
+        # the repo root instead (primp/moyopy hit the same gap).
+        run: cp LICENSE.txt bindings/python/
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: bindings/python
+          output-dir: wheelhouse/
+        env:
+          # musllinux is dropped: rustup.rs ships no riscv64 musl toolchain.
+          CIBW_BUILD: ${{ matrix.build }}
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          # semantic-text-splitter ships no [tool.cibuildwheel], so the Rust
+          # toolchain its maturin backend needs is installed in-container here.
+          CIBW_BEFORE_ALL_LINUX: >-
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+          # tree-sitter-python's own sdist (no riscv64 wheel on public PyPI)
+          # builds clean but is missing the external scanner's symbols; our
+          # registry already carries a correctly-built riscv64 wheel for it
+          # (cp310-abi3 leg only -- see matrix.test-requires for cp314t).
+          CIBW_ENVIRONMENT_LINUX: >-
+            PATH="$PATH:$HOME/.cargo/bin"
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          CIBW_TEST_REQUIRES: ${{ matrix.test-requires }}
+          CIBW_TEST_SOURCES: bindings/python/tests
+          CIBW_TEST_COMMAND: >-
+            python -c "import semantic_text_splitter, importlib.metadata as md;
+            files = md.files('semantic-text-splitter');
+            assert any(str(p).endswith('.so') for p in files), files;
+            assert any(str(p).endswith('licenses/LICENSE.txt') for p in files)" &&
+            ${{ matrix.test-command }}
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: semantic-text-splitter-${{ env.SEMANTIC_TEXT_SPLITTER_VERSION }}-${{ matrix.tag }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish semantic-text-splitter ${{ inputs.version || '0.32.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: semantic-text-splitter-${{ inputs.version || '0.32.0' }}-*-manylinux_riscv64