Develop on Python 3.14, support 3.11+, add non-blocking 3.15 lane

.github/workflows/docs_pages.yaml

@@ -21,8 +21,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Install dependencies
         run: uv sync --all-extras

.github/workflows/linting.yaml

@@ -10,8 +10,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Install dependencies
         run: uv sync --all-extras

.github/workflows/publish.yml

@@ -24,7 +24,10 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: [ "3.12", "3.13", "3.14" ]
+        # Mirrors the blocking legs of tests.yaml. Deliberately excludes the
+        # experimental 3.15 lane — a release gate must not depend on a leg
+        # that is allowed to fail.
+        python-version: [ "3.11", "3.12", "3.13", "3.14" ]
     name: pytest (Python ${{ matrix.python-version }})
     steps:
       - name: Checkout
@@ -56,8 +59,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Install dependencies
         run: uv sync --all-extras
@@ -80,8 +83,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Build
         run: uv build

.github/workflows/tests.yaml

@@ -34,8 +34,24 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.12", "3.13", "3.14" ]
-    name: pytest (Python ${{ matrix.python-version }})
+        # Supported range: 3.11 (floor, see requires-python in pyproject.toml)
+        # through 3.14 (the development version, see .python-version).
+        python-version: [ "3.11", "3.12", "3.13", "3.14" ]
+        experimental: [ false ]
+        include:
+          # Forward-looking lane for the next release (3.15, due 2026-10-01).
+          # Non-blocking on purpose: as of 3.15.0a8 this fails during
+          # *dependency installation*, not during our tests — shapely has no
+          # 3.15 wheels yet, so uv falls back to a source build that needs
+          # numpy headers. That is an upstream packaging gap, NOT an
+          # OSHConnect incompatibility. Expect this leg to go green on its
+          # own once shapely ships 3.15 wheels; if it fails for any other
+          # reason, that IS worth investigating.
+          - python-version: "3.15"
+            experimental: true
+    name: pytest (Python ${{ matrix.python-version }}${{ matrix.experimental && ' — experimental, non-blocking' || '' }})
+    # Only the experimental leg is allowed to fail without failing the run.
+    continue-on-error: ${{ matrix.experimental }}
     steps:
       - name: Checkout
         uses: actions/checkout@v5
@@ -85,12 +101,12 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Install package with NO extras
         run: |
-          uv venv --python 3.13
+          uv venv --python 3.14
           uv pip install .
 
       - name: Import smoke test (no extras)
@@ -138,8 +154,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       - name: Install dependencies
         run: uv sync --all-extras
@@ -186,8 +202,8 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
 
-      - name: Install Python 3.13
-        run: uv python install 3.13
+      - name: Install Python 3.14
+        run: uv python install 3.14
 
       # Append `.dev<run_number>` to the version in pyproject.toml so each
       # dev push gets a fresh PEP 440-compliant pre-release (e.g.

.gitignore

@@ -161,7 +161,11 @@ cython_debug/
 
 .idea/
 
-.python-version
+# .python-version is intentionally TRACKED — it pins development to 3.14.
+# Without it, uv selects the newest stable interpreter satisfying
+# requires-python (>=3.11), so every contributor would silently move to
+# 3.15 the day it ships. 3.15 is meant to be a non-blocking preview lane
+# in tests.yaml, not the dev environment.
 
 poetry.lock
 

.python-version

@@ -0,0 +1 @@
+3.14

README.md

@@ -94,8 +94,13 @@ coverage is on, source is scoped to `src/oshconnect`, and obvious dead lines
 (`if TYPE_CHECKING:`, `raise NotImplementedError`, etc.) are excluded.
 
 CI (`.github/workflows/tests.yaml`) runs the suite with `--cov` on every push
-across Python 3.12 / 3.13 / 3.14 and uploads `coverage.xml` as a workflow
-artifact (downloadable from the run page).
+across Python 3.11 / 3.12 / 3.13 / 3.14 and uploads `coverage.xml` as a workflow
+artifact (downloadable from the run page). A further non-blocking lane runs
+against the 3.15 pre-release as an early-warning signal; it is allowed to fail
+and does not gate merges.
+
+Development happens on Python 3.14 (pinned in `.python-version`); 3.11 is the
+supported floor.
 
 ## Documentation Coverage
 

docs/source/architecture/index.md

@@ -103,7 +103,7 @@ For the inverse direction (creating resources server-side), see
 
 - **pydantic** — all resource and schema models. Bumping the minimum requires
   confirming pre-built wheels exist for all supported Python versions
-  (3.12 – 3.14).
+  (3.11 – 3.14).
 - **shapely** — geometry handling for spatial resources.
 - **paho-mqtt** — MQTT streaming for CS API Part 3.
 - **websockets** / **aiohttp** — WebSocket and async HTTP streaming.

pyproject.toml

@@ -1,12 +1,19 @@
 [project]
 name = "oshconnect"
-version = "0.5.3a1"
+version = "0.5.4a0"
 description = "Library for interfacing with OSH, helping guide visualization efforts, and providing a place to store configurations. Implements OGC CS API Part 3 (Pub/Sub) MQTT topic conventions including :data topics and resource event topics."
 readme = "README.md"
 authors = [
     { name = "Ian Patterson", email = "ian.patterson@georobotix.us" },
 ]
-requires-python = "<4.0,>=3.12"
+# Floor is 3.11, not 3.10: `datetime.fromisoformat` only accepts arbitrary
+# ISO 8601 fractional-second precision from 3.11 on. 3.10 rejects the
+# 5-digit form OSH emits (`…T17:12:58.51182Z`) with "Invalid isoformat
+# string", failing tests/test_resource_datamodels.py::test_control_stream_resource.
+# Dropping to 3.10 is possible but needs a parsing shim in timemanagement.py —
+# don't lower this without adding one. Development happens on 3.14 (see
+# .python-version); the full matrix is in .github/workflows/tests.yaml.
+requires-python = "<4.0,>=3.11"
 # Core stays transport-free: HTTP discovery/CRUD and the pydantic model layer
 # only. Streaming transports are opt-in extras ([mqtt], [nats], [streaming])
 # so minimal installs stay small — see [project.optional-dependencies].