diff --git a/.gitignore b/.gitignore
index ccc697f5b..56b313732 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,8 @@ doc/build
 
 # example files
 doc/source/examples/**/*.*
+!doc/source/examples/conftest.py
+!doc/source/examples/__init__.py
 !doc/source/examples/**/*.ipynb
 !doc/source/examples/**/*.rst
 !doc/source/examples/**/*.gif
diff --git a/doc/source/examples/__init__.py b/doc/source/examples/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/doc/source/examples/conftest.py b/doc/source/examples/conftest.py
new file mode 100644
index 000000000..8bcb19539
--- /dev/null
+++ b/doc/source/examples/conftest.py
@@ -0,0 +1,6 @@
+# type: ignore
+
+
+def pytest_collectstart(collector):
+    if collector.fspath and collector.fspath.ext == ".ipynb":
+        collector.skip_compare += ("stderr",)
diff --git a/mypy.ini b/mypy.ini
index 0c95025b6..2537e4bfa 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -2,3 +2,4 @@
 mypy_path = doc/source/scripts/
 exclude =
     conf.py
+    conftest.py
diff --git a/tests/pytest.ini b/tests/pytest.ini
index 695f8b479..246ec2353 100644
--- a/tests/pytest.ini
+++ b/tests/pytest.ini
@@ -1,5 +1,5 @@
 [pytest]
-addopts = --nbval --current-env --sanitize-with ./sanitize_output.cfg
+addopts = --nbval --nbval-current-env --nbval-sanitize-with ./sanitize_output.cfg
 testpaths =
     ../doc/source/examples/analysis/volumetric/
     ../doc/source/examples/analysis/custom_parallel_analysis.ipynb