diff --git a/requirements.in b/requirements.in
index 8bb59da740522db978c06c969879412e6e6cb081..a15e6999589a300af35b9ccf1041d528685fafde 100644
--- a/requirements.in
+++ b/requirements.in
@@ -4,4 +4,5 @@ molecule~=2.14.0
 paramiko
 pip-tools
 python-vagrant
-sphinx~=1.7.0
\ No newline at end of file
+sphinx~=1.7.0
+sphinx_rtd_theme~=0.4.0
\ No newline at end of file