diff --git a/.github/workflows/build-simplification.yml b/.github/workflows/build-simplification.yml
index ce6da191b7ba..d42a4ed0656c 100644
--- a/.github/workflows/build-simplification.yml
+++ b/.github/workflows/build-simplification.yml
@@ -117,7 +117,13 @@ jobs:
             cp target/release/librdp.so include/header.h {project}/src/simplification/
           # numpy/cython have riscv64 wheels only on our registry; cython-cmake
           # and scikit-build-core are pure Python and resolve from public PyPI.
-          CIBW_ENVIRONMENT: PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
+          # PATH: from 2.0.0 the build backend is maturin, which looks for cargo on
+          # PATH and otherwise tries to rustup-install into a temp dir (and fails:
+          # "Target triple not supported by rustup: riscv64-unknown-linux-gnu");
+          # CIBW_BEFORE_ALL_LINUX's rustup puts it in ~/.cargo/bin.
+          CIBW_ENVIRONMENT_LINUX: >-
+            PATH=$HOME/.cargo/bin:$PATH
+            PIP_EXTRA_INDEX_URL=https://pypi.riseproject.dev/simple/
           CIBW_TEST_ENVIRONMENT: PIP_ONLY_BINARY=numpy
 
       - name: Check wheel contents
diff --git a/docs/packages/simplification.yaml b/docs/packages/simplification.yaml
index 90cb479a6060..f96994c14c0b 100644
--- a/docs/packages/simplification.yaml
+++ b/docs/packages/simplification.yaml
@@ -12,3 +12,4 @@ versions:
   - filename: simplification-1.0.0-cp314-cp314t-manylinux_2_34_riscv64.manylinux_2_39_riscv64.whl
     sha256: 11ed3047ecceef29e61ab76a528d0977e19ee11e8b9bba193bdb708d0309f6fb
     requires-python: '>=3.10'
+- version: 2.0.0
diff --git a/patches/simplification/2.0.0/0001-package-the-mit-licence-of-the-vendored-rdp-rust-lib.patch b/patches/simplification/2.0.0/0001-package-the-mit-licence-of-the-vendored-rdp-rust-lib.patch
new file mode 100644
index 000000000000..a3e459df4447
--- /dev/null
+++ b/patches/simplification/2.0.0/0001-package-the-mit-licence-of-the-vendored-rdp-rust-lib.patch
@@ -0,0 +1,73 @@
+From 3b53c29ccc02ff7f7d4fa5bf85c996e4dd336b2d Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Tue, 8 Sep 2026 07:21:11 +0200
+Subject: [PATCH] package the MIT licence of the vendored rdp Rust library
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+simplification's Cython extension (src/simplification/cutil.pyx) links
+against librdp.so, a prebuilt cdylib that upstream's own CI downloads
+from urschrei/rdp's GitHub releases and CMakeLists.txt bundles into
+the wheel via install(FILES ... DESTINATION ${SKBUILD_PROJECT_NAME}).
+rdp has no riscv64 release asset, so our build compiles it from source
+(urschrei/rdp v0.15.0, the tag that was latest when simplification
+1.0.0 shipped) instead - see build-simplification.yml. Either way the
+library ships inside the wheel, and rdp is MIT-licensed (Copyright (c)
+2016 Stephan Hügel), so its licence needs to travel with the binary.
+
+pyproject.toml sets license-files = ["LICENSE.md"] explicitly, which
+is PEP 639's opt-in form -- unlike setuptools' default LICEN[CS]E*
+glob, a licence file dropped at the project root is not picked up on
+its own, so the list itself needs extending.
+
+Upstream-Status: To upstream [not filed against urschrei/simplification from this automated port; a maintainer should report it upstream]
+---
+ LICENSE_rdp    | 21 +++++++++++++++++++++
+ pyproject.toml |  2 +-
+ 2 files changed, 22 insertions(+), 1 deletion(-)
+ create mode 100644 LICENSE_rdp
+
+diff --git a/LICENSE_rdp b/LICENSE_rdp
+new file mode 100644
+index 0000000..3331443
+--- /dev/null
++++ b/LICENSE_rdp
+@@ -0,0 +1,21 @@
++The MIT License (MIT)
++
++Copyright (c) 2016 Stephan Hügel
++
++Permission is hereby granted, free of charge, to any person obtaining a copy
++of this software and associated documentation files (the "Software"), to deal
++in the Software without restriction, including without limitation the rights
++to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
++copies of the Software, and to permit persons to whom the Software is
++furnished to do so, subject to the following conditions:
++
++The above copyright notice and this permission notice shall be included in
++all copies or substantial portions of the Software.
++
++THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
++IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
++FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
++AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
++LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
++OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
++THE SOFTWARE.
+diff --git a/pyproject.toml b/pyproject.toml
+index 97ca438..d8d4c02 100644
+--- a/pyproject.toml
++++ b/pyproject.toml
+@@ -10,7 +10,7 @@ dependencies = [
+ authors = [{ name = "Stephan Hügel" }, { email = "urschrei@gmail.com" }]
+ maintainers = [{ name = "Stephan Hügel" }, { email = "urschrei@gmail.com" }]
+ license = "BlueOak-1.0.0"
+-license-files = ["LICENSE.md"]
++license-files = ["LICENSE.md", "LICENSE_rdp"]
+ keywords = ["Geo", "Polyline", "Linestring", "Ramer-Douglas-Peucker", "Douglas-Peucker", "Visvalingam-Whyatt"]
+ classifiers = [
+     "Programming Language :: Python",
+-- 
+2.50.1 (Apple Git-155)
+