diff --git a/requirements_dev.txt b/requirements_dev.txt
index 96f9e4e..be29426 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.8.4
 tox==3.5.2
 coverage==4.5.1
-Sphinx==1.8.1
+Sphinx==3.3.0
 twine==1.12.1
 
 pytest==3.8.2