diff --git a/requirements.txt b/requirements.txt
index f0c0150..311bb04 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-rdflib-endpoint
+rdflib-endpoint >= 0.4.0
 codemetapy >= 2.5.0
 codemeta2html >= 0.1.0
 fastapi