diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 484c7dbf..d004c61c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -41,7 +41,7 @@ jobs:
           - os: ubuntu-latest
             python-version: "3.11"
             sphinx: "==7.0.0"
-            myst-parser: "==2.0.0"
+            myst-parser: "==3.0.0"
           # Newest known-compatible dependencies
           - os: ubuntu-latest
             python-version: "3.12"
diff --git a/myst_nb/core/read.py b/myst_nb/core/read.py
index 8fc2bb67..9bf6befb 100644
--- a/myst_nb/core/read.py
+++ b/myst_nb/core/read.py
@@ -57,8 +57,11 @@ def create_nb_reader(
     :returns: the notebook reader, and the (potentially modified) MdParserConfig,
         or None if the input cannot be read as a notebook.
     """
-    # the import is here so this module can be loaded without sphinx
-    from sphinx.util import import_object
+
+    try:
+        from sphinx.util._importer import import_object
+    except ImportError:
+        from sphinx.util import import_object
 
     # get all possible readers
     readers = nb_config.custom_formats.copy()
diff --git a/pyproject.toml b/pyproject.toml
index 6a62fa0e..b80ede9f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -131,6 +131,7 @@ show_error_codes = true
 check_untyped_defs = true
 strict_equality = true
 no_implicit_optional = true
+ignore_missing_imports = true
 warn_unused_ignores = true
 
 [[tool.mypy.overrides]]
@@ -149,3 +150,25 @@ ignore = [
 
 [tool.ruff.lint.isort]
 force-sort-within-sections = true
+
+[tool.pytest.ini_options]
+filterwarnings = [
+    'error',
+    'ignore:unclosed database in:ResourceWarning',
+    # from asyncio triggered by jupyter_client
+    'ignore:There is no current event loop:DeprecationWarning',
+    'ignore:Parsing dates involving a day of month without a year specified is :DeprecationWarning',
+    # from jupyter_core
+    'ignore:Jupyter is migrating its paths to use standard platformdirs:DeprecationWarning',
+    # nbclient
+    'ignore:Parsing dates involving a day of month without a year specified is :DeprecationWarning:nbclient',
+    # From dateutil in sqlalchemy and jupyter_cache
+    'ignore:datetime.datetime.utcnow\(\) is deprecated:DeprecationWarning:sqlalchemy',
+    'ignore:datetime.datetime.utcnow\(\) is deprecated:DeprecationWarning:jupyter_cache',
+    # Windows issues, some may need to be fixed in MyST-NB, others are upstream
+    'ignore:Proactor event loop does not implement add_reader:RuntimeWarning:zmq',
+]
+
+markers = [
+    "sphinx_params",
+]