diff --git a/setup.cfg b/setup.cfg
index a615a04d..b736709d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -54,7 +54,7 @@ dev =
     zest.releaser>=6.20.1
 
 doc =
-    Sphinx==3.5.3
+    Sphinx==4.0.2
     docutils==0.17.1
 
 [options.entry_points]