diff --git a/requirements/developer.pip b/requirements/developer.pip
index 6b839fa3..e5507151 100644
--- a/requirements/developer.pip
+++ b/requirements/developer.pip
@@ -3,4 +3,4 @@
 # Development
 flake8
 flake8-import-order
-sphinx
+sphinx==1.4.9
diff --git a/tox.ini b/tox.ini
index 1e04df53..cb400ea7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,7 @@ commands =
 [testenv:docs]
 basepython = python2.7
 deps =
-    sphinx
+    sphinx==1.4.9
     sphinx_rtd_theme
 changedir = docs
 commands =