diff --git a/setup.cfg b/setup.cfg
index 37dd333..1eec727 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 [metadata]
 name = iamport-rest-client
-version = 0.9.0
+version = 0.9.1
 author = PerhapsSPY
 author_email = perhapsspy@gmail.com
 description = REST client for I'mport;(http://www.iamport.kr)
@@ -28,16 +28,16 @@ zip_safe = False
 packages = find:
 python_requires = >=3.6
 install_requires =
-  requests==2.26.0
+  requests>=2.26.0
 
 [options.extras_require]
 dev =
-  pytest==6.2.4
+  pytest>=6.2.4
   pytest-cov==2.12.1
   flake8==4.0.1
   isort==5.9.3
   mypy==0.910
-  types-requests==2.26.0
+  types-requests>=2.26.0
 
 [options.packages.find]
 exclude = tests
diff --git a/tests/test_pay_foreign.py b/tests/test_pay_foreign.py
index 11b9762..beb461b 100644
--- a/tests/test_pay_foreign.py
+++ b/tests/test_pay_foreign.py
@@ -18,4 +18,4 @@ def test_pay_foreign(iamport):
     try:
         iamport.pay_foreign(**payload)
     except iamport.ResponseError as e:
-        assert e.code == -1
+        assert e.code == 1