diff --git a/requirements_dev.txt b/requirements_dev.txt
index bb99b04..43b7b91 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.8
 tox==3.14.0
 coverage==4.5.4
-Sphinx==2.2.0
+Sphinx==2.2.1
 cryptography==2.7
 PyYAML==5.1.2
 pytest==5.2.1