diff --git a/tests/test_innodrive.py b/tests/test_innodrive.py
index 72f3008..387697b 100644
--- a/tests/test_innodrive.py
+++ b/tests/test_innodrive.py
@@ -2,7 +2,7 @@
 
 import pytest
 from hypothesis import given
-import json
+import ujson
 import hypothesis.strategies as st
 
 from httpx import Client
@@ -38,7 +38,7 @@ def test_budget_multiple_requests(test_app, email, numbers):
         "planned_time": numbers,
         "inno_discount": "no"
     }
-    response = test_app.post("/rangeprice/" + email, content=json.dumps(data))
+    response = test_app.post("/rangeprice/" + email, content=ujson.dumps(data))
     assert response.json()['price'] == my_spec["budget_minute_price"] * numbers
 
 @pytest.mark.parametrize("email", ["m.matantsev@innopolis.university"])
@@ -53,5 +53,5 @@ def test_luxury_multiple_requests(test_app, email, numbers):
         "planned_time": numbers,
         "inno_discount": "no"
     }
-    response = test_app.post("/rangeprice/" + email, content=json.dumps(data))
+    response = test_app.post("/rangeprice/" + email, content=ujson.dumps(data))
     assert response.json()['price'] == my_spec["luxury_minute_price"] * numbers