diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1c1e1aa..4555574 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.8
 tox==3.13.2
 coverage==4.5.4
-Sphinx==2.1.2
+Sphinx==4.1.2
 
 github3.py==1.3.0
 pytest==5.0.1