diff --git a/requirements.txt b/requirements.txt
index e4e87ee6..3b4d96d2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,3 +31,6 @@ python-mimeparse~=1.6.0
 
 # For /metrics (prometheus exporter)
 prometheus-client~=0.14.1
+
+# Documentation theme for readthedocs
+renku-sphinx-theme~=0.2.2