diff --git a/tests/integration/conftest.py b/tests/integration/conftest.py
index abb3849..61ce47a 100644
--- a/tests/integration/conftest.py
+++ b/tests/integration/conftest.py
@@ -144,7 +144,7 @@ def application(account, application_plan, application_params) -> Application:
 
 @pytest.fixture(scope='module')
 def app_key_params(account, application):
-    value = ''.join(random.choices(string.ascii_uppercase + string.digits + '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~', k=100))
+    value = ''.join(random.choices(string.ascii_uppercase + string.digits + '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~', k=255))
     return({"application_id": application["id"], "account_id": account["id"], "key": value})
 
 
diff --git a/tests/integration/test_integration_application.py b/tests/integration/test_integration_application.py
index 051bc99..0cbdf35 100644
--- a/tests/integration/test_integration_application.py
+++ b/tests/integration/test_integration_application.py
@@ -1,5 +1,6 @@
 import random
 import string
+import base64
 import secrets
 import pytest
 
@@ -38,8 +39,17 @@ def test_application_key_list(application, app_key):
     keys = application.keys.list()
     assert len(keys) > 0
 
+
 def test_application_update_userkey(application):
-    new_key = "".join(random.choices(string.ascii_letters + string.digits + "-_.", k=100))
+    new_key = "".join(random.choices(string.ascii_letters + string.digits + "-_.", k=255))
+    updated_application = application.update(params={"user_key": new_key})
+    asserts.assert_resource(updated_application)
+    assert updated_application["user_key"] == new_key
+
+
+def test_application_update_userkey_base64(application):
+    new_key = "".join(random.choices(string.ascii_letters + string.digits + "-_.", k=41))
+    new_key = base64.b64encode(new_key.encode('ascii')).decode()
     updated_application = application.update(params={"user_key": new_key})
     asserts.assert_resource(updated_application)
     assert updated_application["user_key"] == new_key