diff --git a/requirements_dev.txt b/requirements_dev.txt
index cf8d8aa..fe2de25 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,6 +3,6 @@ wheel==0.33.4
 flake8==3.7.7
 tox==3.12.1
 coverage==4.5.3
-Sphinx==2.0.1
+Sphinx==2.1.1
 sphinx-rtd-theme==0.4.3
 cryptography==2.6.1