diff --git a/requirements_dev.txt b/requirements_dev.txt
index f75babd..d8a7fc9 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -5,7 +5,7 @@ watchdog==0.9.0
 flake8==3.6.0
 tox==3.5.3
 coverage==4.5.1
-Sphinx==1.8.3
+Sphinx==1.8.5
 cryptography==2.6.1
 PyYAML==3.12
 pytest==4.0.2