diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f06b150b..0a81b6b9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -91,6 +91,29 @@ jobs:
       - name: Run fuzz session
         run: uv tool run --from 'nox[uv]==2026.4.10' nox -f noxfile.py -s fuzz
 
+  # Every interpreter `requires-python` admits and the trove classifiers
+  # advertise. `verify` stays single-version because it owns the coverage
+  # artifact Sonar consumes and the Isabelle replay, neither of which varies by
+  # interpreter; this job carries the compatibility signal on the hermetic suite
+  # alone, so a release cannot advertise a version nothing exercises.
+  interpreters:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+      - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@c771a70e6277c0a99b617c7a806ffedaca235ff9 # v8
+      - name: Run unit suite
+        env:
+          UV_PYTHON: ${{ matrix.python-version }}
+        run: uv tool run --from 'nox[uv]==2026.4.10' nox -f noxfile.py -s tests
+
   # Opt-in, non-blocking, runtime-gated container integration tests (RUN-314).
   # Kept out of the hermetic `verify` graph; the `docker` marker tests self-skip
   # when no runtime is present, and this whole job never fails the build.
diff --git a/implementations/python/pyproject.toml b/implementations/python/pyproject.toml
index 4616679d..dd059339 100644
--- a/implementations/python/pyproject.toml
+++ b/implementations/python/pyproject.toml
@@ -14,6 +14,8 @@ classifiers = [
     "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
     "typer>=0.12.0",
diff --git a/implementations/python/tests/test_mcp_server.py b/implementations/python/tests/test_mcp_server.py
index 57c73669..89f409ba 100644
--- a/implementations/python/tests/test_mcp_server.py
+++ b/implementations/python/tests/test_mcp_server.py
@@ -31,7 +31,7 @@ def _text(result) -> str:
 
 def _call(server, tool: str, args: dict | None = None) -> str:
     """Synchronously call a tool and return its text."""
-    return asyncio.get_event_loop().run_until_complete(_async_call(server, tool, args or {}))
+    return asyncio.run(_async_call(server, tool, args or {}))
 
 
 async def _async_call(server, tool: str, args: dict) -> str:
@@ -897,7 +897,7 @@ def test_server_has_all_tools(self):
         # Using the real registration surface (rather than a hand-copied
         # literal) means a drift between what the server exposes and what
         # raes_tool_surface advertises cannot pass silently.
-        registered = asyncio.get_event_loop().run_until_complete(server.list_tools())
+        registered = asyncio.run(server.list_tools())
         registered_names = {tool.name for tool in registered}
         assert registered_names, "server registered no tools"