diff --git a/httprunner/__about__.py b/httprunner/__about__.py
index 9f31a860..e4c3adbf 100644
--- a/httprunner/__about__.py
+++ b/httprunner/__about__.py
@@ -1,7 +1,7 @@
 __title__ = 'HttpRunner'
 __description__ = 'HTTP test runner, not just about api test and load test.'
 __url__ = 'https://github.com/HttpRunner/HttpRunner'
-__version__ = '1.1.0-beta.1'
+__version__ = '1.1.0-beta.2'
 __author__ = 'debugtalk'
 __author_email__ = 'mail@debugtalk.com'
 __license__ = 'MIT'
diff --git a/httprunner/task.py b/httprunner/task.py
index 18a2dc3d..ca0ee5eb 100644
--- a/httprunner/task.py
+++ b/httprunner/task.py
@@ -12,7 +12,7 @@ class TestCase(unittest.TestCase):
     def __init__(self, test_runner, testcase_dict):
         super(TestCase, self).__init__()
         self.test_runner = test_runner
-        self.testcase_dict = testcase_dict
+        self.testcase_dict = copy.copy(testcase_dict)
 
     def runTest(self):
         """ run testcase and check result.
diff --git a/httprunner/utils.py b/httprunner/utils.py
index b47e8d46..688dfb41 100644
--- a/httprunner/utils.py
+++ b/httprunner/utils.py
@@ -331,7 +331,7 @@ def override_variables_binds(variables, new_mapping):
     """
     if isinstance(variables, list):
         variables_ordered_dict = convert_to_order_dict(variables)
-    elif isinstance(variables, OrderedDict):
+    elif isinstance(variables, (OrderedDict, dict)):
         variables_ordered_dict = variables
     else:
         raise exception.ParamsError("variables error!")