diff --git a/docs/server/requirements.txt b/docs/server/requirements.txt
index 4321f44b..cd06eab9 100644
--- a/docs/server/requirements.txt
+++ b/docs/server/requirements.txt
@@ -3,3 +3,5 @@ recommonmark>=0.4.0
 sphinx-rtd-theme>=0.1.9
 sphinxcontrib-napoleon>=0.4.4
 sphinxcontrib-httpdomain>=1.5.0
+pyyaml>=3.12
+bigchaindb