diff --git a/setup.cfg b/setup.cfg
index e5ffda7..7420867 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -21,7 +21,7 @@ include_package_data = true
 install_requires =
     pandas
     pyshacl
-    rdflib >= 6.2.0
+    rdflib >= 6.2.0, < 7.0.0
     requests
     tabulate
 packages = find: