diff --git a/requirements_dev.txt b/requirements_dev.txt
index 0ad5caa..7ade3e0 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.7.9
 tox==3.14.6
 coverage==5.0.4
-Sphinx==2.3.1
+Sphinx==3.0.1
 cryptography==2.8
 PyYAML==5.3
 pytest==5.3.5