diff --git a/requirements_dev.txt b/requirements_dev.txt
index 09890bc..1a64fd4 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ wheel==0.31.1
 watchdog==0.10.3
 tox==3.4.0
 coverage==4.5.3
-Sphinx==3.2.1
+Sphinx==5.1.0
 pygments==2.2.0
 cryptography==2.4.1
 PyYAML==5.3.1