diff --git a/openeo_driver/dummy/dummy_backend.py b/openeo_driver/dummy/dummy_backend.py
index bc1bdfd9..9445aaaa 100644
--- a/openeo_driver/dummy/dummy_backend.py
+++ b/openeo_driver/dummy/dummy_backend.py
@@ -57,8 +57,8 @@ def __init__(self):
         super(DummyVisitor, self).__init__()
         self.processes = []
 
-    def enterProcess(self, process_id: str, arguments: dict):
-        self.processes.append((process_id, arguments))
+    def enterProcess(self, process_id: str, arguments: dict, namespace: Union[str, None]):
+        self.processes.append((process_id, arguments, namespace))
 
     def constantArgument(self, argument_id: str, value):
         if isinstance(value, numbers.Real):
diff --git a/setup.py b/setup.py
index b94b5f6a..8a56f5d5 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,7 @@
         'flask',
         'werkzeug>=1.0.1',
         'requests',
-        'openeo>=0.4.10a2.*',
+        'openeo>=0.5.0a1.*',
         'openeo_processes>=0.0.4',
         'gunicorn>=20.0.1',
         'numpy>=1.17.0,<1.19.0',#tensorflow 2.3 requires numpy <1.19