diff --git a/tools/test-requires b/tools/test-requires
index cba42a4..27851da 100644
--- a/tools/test-requires
+++ b/tools/test-requires
@@ -6,3 +6,6 @@
 #
 #TODO(afazekas): ensure pg_config installed
 psycopg2
+# needed for doc build
+sphinx>=1.1.2
+