diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..a34a56c
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,15 @@
+"""Doctest configuration."""
+
+from doctest import ELLIPSIS, NORMALIZE_WHITESPACE
+
+from sybil import Sybil
+from sybil.parsers.rest import DocTestParser, PythonCodeBlockParser, SkipParser
+
+pytest_collect_file = Sybil(
+    parsers=[
+        DocTestParser(optionflags=NORMALIZE_WHITESPACE | ELLIPSIS),
+        PythonCodeBlockParser(),
+        SkipParser(),
+    ],
+    patterns=["*.rst", "*.py"],
+).pytest()
diff --git a/pyproject.toml b/pyproject.toml
index 3645f4e..8b87807 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ dependencies = [
 test = [
   "pytest >=6",
   "pytest-cov >=3",
+  "sybil",
 ]
 dev = [
   "pytest >=6",