diff --git a/requirements_dev.txt b/requirements_dev.txt
index bf49c07..6613635 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -30,12 +30,13 @@ pytz==2016.7
 PyYAML==3.12
 requests==2.11.1
 requests-toolbelt==0.7.0
-seed==0.11.3
+seed==0.11.2
 semantic-version==2.6.0
 simplejson==3.10.0
 six==1.10.0
 snowballstemmer==1.2.1
 Sphinx==1.6.2
+sphinxcontrib-websupport==1.0.1
 tornado==4.4.2
 tox==2.5.0
 twine==1.3.1