diff --git a/requirements_dev.txt b/requirements_dev.txt
index 9d7da80..85e6d9a 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,7 +4,7 @@ watchdog==0.8.3
 flake8==3.5.0
 tox==2.9.1
 coverage==4.4.2
-Sphinx==1.6.4
+Sphinx==3.0.2
 cryptography==2.1.4
 PyYAML==3.12
 pytest==3.3.1