diff --git a/requirements_dev.txt b/requirements_dev.txt
index 6237eb4..f1e79a4 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.10.2
 flake8==3.7.9
 tox==3.14.6
 coverage==5.1
-Sphinx==3.0.1
+Sphinx==3.1.1
 twine==3.1.1
 Click>=7.0
 python-dateutil>=2.8.1