diff --git a/setup.py b/setup.py
index 45e7baf..f874a88 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@
     'pytest-pycodestyle>=2.2.0;python_version>"3.5"',
     'pytest-pydocstyle>=2;python_version<="3.5"',
     'pytest-pydocstyle>=2.2.0;python_version>"3.5"',
-    'sphinx>=3',
+    'sphinx>=5',
     'tox>=3.7.0',
 ]