1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 29ea10ffb..d708694b0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -92,7 +92,7 @@ commands =
     make -C doc
 # sphinx_rtd_theme < 0.4.2 breaks search functionality for Sphinx >= 1.8
 deps =
-    sphinx
+    sphinx == 1.8.5
     sphinx-click
     sphinx_rtd_theme >= 0.4.2
     pytest