diff --git a/dependencies.yaml b/dependencies.yaml
index a6238168d..02c6a2194 100644
--- a/dependencies.yaml
+++ b/dependencies.yaml
@@ -67,7 +67,7 @@ libevse-security:
 # OCPP
 libocpp:
   git: https://github.com/EVerest/libocpp.git
-  git_tag: e52ac969095804144af4896af1984cedaf45a3f8
+  git_tag: c66383782a32827920af80314165843deed63c98
   cmake_condition: "EVEREST_DEPENDENCY_ENABLED_LIBOCPP"
 # Josev
 Josev:
diff --git a/tests/ocpp_tests/test_sets/ocpp201/reservations.py b/tests/ocpp_tests/test_sets/ocpp201/reservations.py
index 9a83eddfe..74e6a94c6 100644
--- a/tests/ocpp_tests/test_sets/ocpp201/reservations.py
+++ b/tests/ocpp_tests/test_sets/ocpp201/reservations.py
@@ -15,7 +15,7 @@
 from ocpp.v201.datatypes import *
 from ocpp.v201 import call as call_201
 from ocpp.v201 import call_result as call_result201
-from validations import validate_remote_start_stop_transaction
+from validations import (validate_remote_start_stop_transaction, wait_for_callerror_and_validate)
 from ocpp.routing import on, create_route_map
 
 
@@ -629,7 +629,6 @@ async def test_reservation_connector_occupied(
     # start charging session
     test_controller.plug_in()
 
-    # TODO mz fix comments everywhere in this file!!!
     # expect StatusNotification with status occupied
     assert await wait_for_and_validate(
         test_utility,
@@ -735,13 +734,9 @@ async def test_reservation_connector_rejected(
         evse_id=1
     )
 
-    # expect ReserveNow response with status rejected
-    assert await wait_for_and_validate(
-        test_utility,
-        charge_point_v201,
-        "ReserveNow",
-        call_result201.ReserveNowPayload(ReserveNowStatusType.rejected),
-    )
+    assert await wait_for_callerror_and_validate(test_utility,
+                                                 charge_point_v201,
+                                                 "NotImplemented")
 
 
 @pytest.mark.asyncio