diff --git a/requirements.txt b/requirements.txt
index 90c9399dc8..4f691a8d1f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,7 @@ ruamel.yaml
 six
 sphinx
 sphinx-argparse
-sphinx_rtd_theme
+sphinx-rtd-theme==0.2.4
 texttable
 tornado
 urllib3