diff --git a/setup.py b/setup.py
index ccb9f3d6e..60f5209c0 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ with open('README.rst') as f:
 extras_require = {
     'voice': ['PyNaCl==1.3.0'],
     'docs': [
-        'sphinx==1.8.5',
+        'sphinx==2.4.4',
         'sphinxcontrib_trio==1.1.1',
         'sphinxcontrib-websupport',
     ]