diff --git a/README.md b/README.md
index 109c618f..260fc507 100644
--- a/README.md
+++ b/README.md
@@ -109,23 +109,22 @@ settings = {
 smart = client.FHIRClient(settings=settings)
 
 search = Encounter.where(struct={'subject': '2cda5aad-e409-4070-9a15-e1c35c46ed5a', 'status': 'finished'})
-encounters = search.perform_resources(smart.server)
-print({res.type[0].text for res in search.perform_resources(smart.server)})
+print({res.type[0].text for res in search.perform_resources_iter(smart.server)})
 # {'Encounter for symptom', 'Encounter for check up (procedure)'}
 
 # to include the resources referred to by the encounter via `subject` in the results
 search = search.include('subject')
-print({res.resource_type for res in search.perform_resources(smart.server)})
+print({res.resource_type for res in search.perform_resources_iter(smart.server)})
 # {'Encounter', 'Patient'}
 
 # to include the Procedure resources which refer to the encounter via `encounter`
 search = search.include('encounter', Procedure, reverse=True)
-print({res.resource_type for res in search.perform_resources(smart.server)})
+print({res.resource_type for res in search.perform_resources_iter(smart.server)})
 # {'Encounter', 'Patient', 'Procedure'}
 
-# to get the raw Bundle instead of resources only, you can use:
-bundle = search.perform(smart.server)
-print({entry.resource.resource_type for entry in bundle.entry})
+# to get the raw Bundles instead of resources only, you can use:
+bundles = search.perform_iter(smart.server)
+print({entry.resource.resource_type for bundle in bundles for entry in bundle.entry})
 # {'Encounter', 'Patient', 'Procedure'}
 ```
 
diff --git a/demos/flask/flask_app.py b/demos/flask/flask_app.py
index fbde5ee8..34eb7751 100755
--- a/demos/flask/flask_app.py
+++ b/demos/flask/flask_app.py
@@ -38,11 +38,8 @@ def _reset():
         del session['state']
 
 def _get_prescriptions(smart):
-    bundle = MedicationRequest.where({'patient': smart.patient_id}).perform(smart.server)
-    pres = [be.resource for be in bundle.entry] if bundle is not None and bundle.entry is not None else None
-    if pres is not None and len(pres) > 0:
-        return pres
-    return None
+    search = MedicationRequest.where({'patient': smart.patient_id})
+    return list(search.perform_resources_iter(smart.server))
 
 def _get_medication_by_ref(ref, smart):
     med_id = ref.split("/")[1]
@@ -88,7 +85,7 @@ def index():
         # generate simple body text
         body += "<p>You are authorized and ready to make API requests for <em>{0}</em>.</p>".format(name)
         pres = _get_prescriptions(smart)
-        if pres is not None:
+        if pres:
             body += "<p>{0} prescriptions: <ul><li>{1}</li></ul></p>".format("His" if 'male' == smart.patient.gender else "Her", '</li><li>'.join([_get_med_name(p,smart) for p in pres]))
         else:
             body += "<p>(There are no prescriptions for {0})</p>".format("him" if 'male' == smart.patient.gender else "her")
diff --git a/demos/flask/requirements.txt b/demos/flask/requirements.txt
index e69d659d..b06704c8 100644
--- a/demos/flask/requirements.txt
+++ b/demos/flask/requirements.txt
@@ -1,3 +1,3 @@
 beaker>=1.13.0
-fhirclient>=4
+fhirclient>=4.3
 flask>=2.3.2