diff --git a/doc/dev-docs/requirements.txt b/doc/dev-docs/requirements.txt
index cd6467e..cfd7bee 100644
--- a/doc/dev-docs/requirements.txt
+++ b/doc/dev-docs/requirements.txt
@@ -1 +1,3 @@
 breathe
+sphinx=1.6.6
+sphinx-rtd-theme