diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..db5cbf4
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,31 @@
+# Copyright (C) 2024  Jelle van der Werff
+#
+# This file is part of thebeat.
+#
+# thebeat is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# thebeat is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with thebeat.  If not, see <https://www.gnu.org/licenses/>.
+
+import sys
+
+import pytest
+
+NUMPY2_DOCTESTS = [
+    'thebeat.stats.ks_test'
+]
+
+
+def pytest_collection_modifyitems(items):
+    skipif = pytest.mark.skipif(condition=sys.version_info < (3, 9), reason="Doctest requires NumPy 2 to be installed")
+    for item in items:
+        if item.name in NUMPY2_DOCTESTS:
+            item.add_marker(skipif)
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 8d4d82c..baa3a79 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,2 +1,5 @@
 pytest
 pytest-mpl
+
+numpy>=2; python_version>=3.9
+numpy<2; python_version==3.8