diff --git a/monkey/monkey_island/cc/resources/propagation_credentials.py b/monkey/monkey_island/cc/resources/propagation_credentials.py
index 2342d0f37..f3cd05132 100644
--- a/monkey/monkey_island/cc/resources/propagation_credentials.py
+++ b/monkey/monkey_island/cc/resources/propagation_credentials.py
@@ -29,7 +29,7 @@ class PropagationCredentials(AbstractResource):
         return propagation_credentials, HTTPStatus.OK
 
     def post(self, collection=None):
-        credentials = [Credentials.from_json(c) for c in request.json]
+        credentials = [Credentials.from_mapping(c) for c in request.json]
 
         if collection == _configured_collection:
             self._credentials_repository.save_configured_credentials(credentials)
diff --git a/monkey/tests/unit_tests/monkey_island/cc/resources/test_propagation_credentials.py b/monkey/tests/unit_tests/monkey_island/cc/resources/test_propagation_credentials.py
index e613d85b5..37fdb131b 100644
--- a/monkey/tests/unit_tests/monkey_island/cc/resources/test_propagation_credentials.py
+++ b/monkey/tests/unit_tests/monkey_island/cc/resources/test_propagation_credentials.py
@@ -89,8 +89,8 @@ def test_propagation_credentials_endpoint__post_stolen(flask_client, credentials
     resp = flask_client.post(
         url,
         json=[
-            Credentials.to_json(LM_HASH_CREDENTIALS),
-            Credentials.to_json(NT_HASH_CREDENTIALS),
+            Credentials.to_mapping(LM_HASH_CREDENTIALS),
+            Credentials.to_mapping(NT_HASH_CREDENTIALS),
         ],
     )
     assert resp.status_code == HTTPStatus.NO_CONTENT
@@ -134,8 +134,8 @@ def test_propagation_credentials_endpoint__post_not_found(flask_client):
     resp = flask_client.post(
         NON_EXISTENT_COLLECTION_URL,
         json=[
-            Credentials.to_json(LM_HASH_CREDENTIALS),
-            Credentials.to_json(NT_HASH_CREDENTIALS),
+            Credentials.to_mapping(LM_HASH_CREDENTIALS),
+            Credentials.to_mapping(NT_HASH_CREDENTIALS),
         ],
     )
     assert resp.status_code == HTTPStatus.NOT_FOUND