diff --git a/requirements_dev.txt b/requirements_dev.txt
index 1ba26e1..c7376e7 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.8.3
 flake8==3.5.0
 tox==2.9.1
 coverage==4.5.1
-Sphinx==1.7.1
+Sphinx==3.3.0
 twine==1.10.0
 
 pytest==3.4.2