diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4f846b5..d214686 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
+        python-version: [ '3.11', '3.12', '3.13', '3.14', '3.15' ]
 
     steps:
     - name: Checkout
@@ -30,6 +30,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
+        allow-prereleases: true
 
     - name: Install akernel
       run: |
diff --git a/plugins/akernel_task/pyproject.toml b/plugins/akernel_task/pyproject.toml
index 60b37c6..4187af1 100644
--- a/plugins/akernel_task/pyproject.toml
+++ b/plugins/akernel_task/pyproject.toml
@@ -7,7 +7,7 @@ name = "fps_akernel_task"
 version = "0.2.1"
 description = "An FPS plugin for the kernel task API"
 keywords = ["jupyter", "server", "fastapi", "plugins"]
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 dependencies = [
     "jupyverse-api >=0.15.0,<0.16.0",
     "anyio",
@@ -31,3 +31,7 @@ Homepage = "https://github.com/davidbrochart/akernel"
 [project.entry-points]
 "fps.modules"       = {akernel_task = "fps_akernel_task.main:AKernelTaskModule", akernelthread_task = "fps_akernel_task.main:AKernelThreadTaskModule"}
 "jupyverse.modules" = {akernel_task = "fps_akernel_task.main:AKernelTaskModule", akernelthread_task = "fps_akernel_task.main:AKernelThreadTaskModule"}
+
+[tool.hatch.build.targets.wheel.shared-data]
+"share/jupyter/kernels/akernel-task/kernel.json" = "share/jupyter/kernels/akernel-task/kernel.json"
+"share/jupyter/kernels/akernel-thread/kernel.json" = "share/jupyter/kernels/akernel-thread/kernel.json"
diff --git a/share/jupyter/kernels/akernel-task/kernel.json b/plugins/akernel_task/share/jupyter/kernels/akernel-task/kernel.json
similarity index 100%
rename from share/jupyter/kernels/akernel-task/kernel.json
rename to plugins/akernel_task/share/jupyter/kernels/akernel-task/kernel.json
diff --git a/share/jupyter/kernels/akernel-thread/kernel.json b/plugins/akernel_task/share/jupyter/kernels/akernel-thread/kernel.json
similarity index 100%
rename from share/jupyter/kernels/akernel-thread/kernel.json
rename to plugins/akernel_task/share/jupyter/kernels/akernel-thread/kernel.json
diff --git a/pyproject.toml b/pyproject.toml
index c8fe245..6f07115 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,16 +8,16 @@ version = "0.4.1"
 description = "An asynchronous Python Jupyter kernel"
 readme = "README.md"
 license = {text = "MIT"}
-requires-python = ">=3.10"
+requires-python = ">=3.11"
 authors = [{name = "David Brochart", email = "david.brochart@gmail.com"}]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Programming Language :: Python",
-    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: 3.15",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
@@ -57,8 +57,6 @@ packages = ["src/akernel"]
 
 [tool.hatch.build.targets.wheel.shared-data]
 "share/jupyter/kernels/akernel/kernel.json" = "share/jupyter/kernels/akernel/kernel.json"
-"share/jupyter/kernels/akernel-task/kernel.json" = "share/jupyter/kernels/akernel-task/kernel.json"
-"share/jupyter/kernels/akernel-thread/kernel.json" = "share/jupyter/kernels/akernel-thread/kernel.json"
 
 [project.urls]
 Homepage = "https://github.com/davidbrochart/akernel"
diff --git a/src/akernel/message.py b/src/akernel/message.py
index b30a78a..0a5d49d 100644
--- a/src/akernel/message.py
+++ b/src/akernel/message.py
@@ -4,7 +4,7 @@
 import hmac
 import json
 import uuid
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from typing import Any, cast
 
 from dateutil.parser import parse as dateutil_parse  # type: ignore
@@ -22,7 +22,7 @@ def date_to_str(obj: dict[str, Any]):
 
 
 def utcnow() -> datetime:
-    return datetime.now(timezone.utc)
+    return datetime.now(UTC)
 
 
 def feed_identities(msg_list: list[bytes]) -> tuple[list[bytes], list[bytes]]:
diff --git a/tests/test_jupyter_interrupt.py b/tests/test_jupyter_interrupt.py
index f23f3b4..1a81550 100644
--- a/tests/test_jupyter_interrupt.py
+++ b/tests/test_jupyter_interrupt.py
@@ -121,6 +121,8 @@ async def test_jupyter_interrupt_preserves_kernel(
         root = tmp_path
     else:
         root = Path(__file__).resolve().parents[1]
+        if execute_in_thread:
+            root /= "plugins/akernel_task"
     spec_path = root / "share" / "jupyter" / "kernels" / name / "kernel.json"
     spec = json.loads(spec_path.read_text())
     # Use this interpreter and checkout while retaining the shipped launch options.
diff --git a/tests/test_kernelspec.py b/tests/test_kernelspec.py
index c750370..1c1ac63 100644
--- a/tests/test_kernelspec.py
+++ b/tests/test_kernelspec.py
@@ -22,7 +22,10 @@ def test_install_matches_packaged_kernelspec(tmp_path, monkeypatch, options, nam
     app(["install", *options], result_action="return_value")
     relative_path = Path("share/jupyter/kernels") / name / "kernel.json"
     installed = json.loads((tmp_path / relative_path).read_text())
-    packaged = json.loads((Path(__file__).resolve().parents[1] / relative_path).read_text())
+    package_root = Path(__file__).resolve().parents[1]
+    if name != "akernel":
+        package_root /= "plugins/akernel_task"
+    packaged = json.loads((package_root / relative_path).read_text())
     assert installed == packaged
     assert installed["display_name"] == f"Python 3 ({name})"
     assert installed["interrupt_mode"] == interrupt_mode