diff --git a/CHANGELOG.md b/CHANGELOG.md
index f78a51a..e0c392b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 - **Breaking: a canonical file dict nested inside a `Dynamic` input is no longer uploaded.** Such an input is `kind: "unknown"` in the descriptor — the standard's escape hatch — and the walk does not enter it. Uploading on the strength of a `url` key is the value-shape guess this change removes; a caller with a Dynamic input uploads with `upload_file` first and passes the storage URI, which `docs/input-preparation.md` has always prescribed.
 - **`prepare_inputs` accepts the explicit `{concept, content}` input envelope**, not only compact values, closing a parity gap with the JS SDK. An agent that fills an explicit template — the shape the hosted console and MCP hand out — can now hand it straight back; previously every file-bearing envelope position raised `InputPreparationError: Unsupported value at a file input … got dict`. The envelope's `content` is interpreted identically and preserved on output, so the concept annotation rides through to the run.
 - **The documentation is rewritten around the descriptor.** `docs/input-preparation.md` now describes the three call shapes, the signature call, pipe selection and its manifest-only `main_pipe` gap, the envelope, and why the template was the wrong signature source; `docs/architecture.md` follows the removal. It also catches up with v0.9.0, which shipped `output_form` and the `mthds` 0.13.0 bump without touching the docs: the views list is no longer described as having one token, the report's typed fields now include `output_form` and `default_pipe_ref`, and the pipe I/O contracts no longer claim an output carries no schema — 0.13.0 made `json_schema` required there, reversing the reasoning the doc still quoted.
+- **Requires `mthds` 0.14.0 (breaking).** The pin moves from 0.13.0. Nothing in this client changed with it: the release's substantive cut is `MTHDS_STANDARD_VERSION` going from `1.0.0` to `2.0.0`, which this SDK never reads — it stamps no crates and ships no manifest — and the new `is_mthds_version_satisfied` helper and the `parse_constraint` whitespace fix sit in `mthds.package.manifest.schema`, which nothing here imports. `PROTOCOL_VERSION` stays at `0.6.0`, so the routes and the wire contract are untouched. The move still matters to anyone installing this package: `pipelex` pins `mthds` exactly too and has already moved to 0.14.0, so two exact pins on different versions made the pair unresolvable — this is what lets `pipelex` and `pipelex-sdk` co-install again.
 
 ### Security
 
diff --git a/pyproject.toml b/pyproject.toml
index c72f56f..220359a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ classifiers = [
 ]
 
 dependencies = [
-  "mthds==0.13.0",
+  "mthds==0.14.0",
   "pydantic>=2.10.6,<3.0.0",
   "typing-extensions>=4.0.0",
   "httpx>=0.23.0,<1.0.0",
diff --git a/uv.lock b/uv.lock
index 1a38edf..2a51741 100644
--- a/uv.lock
+++ b/uv.lock
@@ -212,7 +212,7 @@ wheels = [
 
 [[package]]
 name = "mthds"
-version = "0.13.0"
+version = "0.14.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -221,9 +221,9 @@ dependencies = [
     { name = "tomlkit" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e4/b6/6c67b86693d01d473444523db0aeadc1afdffaa1748a264dfab9c1c77b1c/mthds-0.13.0.tar.gz", hash = "sha256:ef59ffa94902da72371390cc39d8c0d85dfd2a524dbca2a8909a0a1ba6255607", size = 216142, upload-time = "2026-09-02T15:09:15.937Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/92/59/4ca9539571a2030f9427aeddb01bc334910953ebdfa4ab7db2051a6b8ae7/mthds-0.14.0.tar.gz", hash = "sha256:d2b4a9cd064004dfd5b802bb71c9894601fba9e598426f96e4bede16d52c3900", size = 221186, upload-time = "2026-09-06T21:44:54.585Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/89/26/f73e625b54cfba2e09a29df5e7173e508c25d3f7ce106be69fae6065d76c/mthds-0.13.0-py3-none-any.whl", hash = "sha256:606fef7978bbc8a5b249882c0b9377fed37123f618f8183f29e89b71a4eadac0", size = 85993, upload-time = "2026-09-02T15:09:14.334Z" },
+    { url = "https://files.pythonhosted.org/packages/28/0b/32908eeed33396c5aafd4bcb2a1adc38d0ab8d85c2fde3af0bf4c2f73745/mthds-0.14.0-py3-none-any.whl", hash = "sha256:59a706205b6e6df47345caac01038588d21ab9e9c246afc765ee50b5f27f05a8", size = 87192, upload-time = "2026-09-06T21:44:53.022Z" },
 ]
 
 [[package]]
@@ -326,7 +326,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "httpx", specifier = ">=0.23.0,<1.0.0" },
-    { name = "mthds", specifier = "==0.13.0" },
+    { name = "mthds", specifier = "==0.14.0" },
     { name = "mypy", marker = "extra == 'dev'", specifier = "==1.19.1" },
     { name = "pydantic", specifier = ">=2.10.6,<3.0.0" },
     { name = "pylint", marker = "extra == 'dev'", specifier = "==4.0.4" },