diff --git a/.github/workflows/nox.yml b/.github/workflows/nox.yml
index a03b2d7b..69dc0051 100644
--- a/.github/workflows/nox.yml
+++ b/.github/workflows/nox.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.11", "3.12", "3.13"]
+        python-version: ["3.11", "3.12", "3.13", "3.14"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/adaptive/runner.py b/adaptive/runner.py
index b2e5ec9a..1ab058a1 100644
--- a/adaptive/runner.py
+++ b/adaptive/runner.py
@@ -626,7 +626,7 @@ def __init__(
             raise_if_retries_exceeded=raise_if_retries_exceeded,
             allow_running_forever=True,
         )
-        self.ioloop = ioloop or asyncio.get_event_loop()
+        self.ioloop = ioloop if ioloop is not None else _get_or_create_event_loop()
 
         # When the learned function is 'async def', we run it
         # directly on the event loop, and not in the executor.
@@ -987,7 +987,22 @@ def replay_log(
         getattr(learner, method)(*args)
 
 
-# -- Internal executor-related, things
+# -- Internal executor-related things
+
+
+def _get_or_create_event_loop() -> asyncio.AbstractEventLoop:
+    """Get the running event loop or create a new one.
+
+    In Python 3.10+, asyncio.get_event_loop() is deprecated when no loop is running.
+    In Python 3.14+, it raises RuntimeError instead of creating a new loop.
+    This function provides a compatible way to get or create an event loop.
+    """
+    try:
+        return asyncio.get_running_loop()
+    except RuntimeError:
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        return loop
 
 
 def _ensure_executor(executor: ExecutorTypes | None) -> concurrent.Executor:
diff --git a/noxfile.py b/noxfile.py
index 71a2217a..06b816fc 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -6,7 +6,7 @@
 
 nox.options.default_venv_backend = "uv"
 
-python = ["3.11", "3.12", "3.13"]
+python = ["3.11", "3.12", "3.13", "3.14"]
 num_cpus = os.cpu_count() or 1
 xdist = ("-n", "auto") if num_cpus > 2 else ()
 
diff --git a/pyproject.toml b/pyproject.toml
index 5c7186e9..e3f4d28f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
     "scipy",