diff --git a/doc-requirements.txt b/doc-requirements.txt
index 446ed9d980da..d9e3e3ef79c7 100644
--- a/doc-requirements.txt
+++ b/doc-requirements.txt
@@ -6,7 +6,7 @@
 # Install the documentation requirements with:
 #     pip install -r doc-requirements.txt
 #
-sphinx>=1.3,!=1.5.0,!=1.6.4,!=1.7.3
+sphinx>=1.3,!=1.5.0,!=1.6.4,!=1.7.3,<1.8
 colorspacious
 ipython
 ipywidgets