diff --git a/requirements.txt b/requirements.txt
index 668b6ea6f..473841ac9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ coverage==4.5.3
 coveralls==1.6.0
 
 # Documentation generation
-Sphinx==1.8.4
+Sphinx==1.8.5
 
 # Code style and type checks
 mypy==0.670