diff --git a/setup.py b/setup.py
index 65035ca..1d8075b 100755
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
   long_description=open(README).read(),
   package_dir={'fluent': 'fluent'},
   packages=['fluent'],
-  install_requires=['msgpack<1.0.0'],
+  install_requires=['msgpack>=1.0.0'],
   author='Kazuki Ohta',
   author_email='kazuki.ohta@gmail.com',
   url='https://github.com/fluent/fluent-logger-python',
diff --git a/tests/mockserver.py b/tests/mockserver.py
index 426d139..096f0d0 100644
--- a/tests/mockserver.py
+++ b/tests/mockserver.py
@@ -68,7 +68,7 @@ def get_received(self):
         self._buf.seek(0)
         # TODO: have to process string encoding properly. currently we assume
         # that all encoding is utf-8.
-        return list(Unpacker(self._buf, encoding='utf-8'))
+        return list(Unpacker(self._buf))
 
     def close(self):