diff --git a/cyaron/__init__.py b/cyaron/__init__.py
index 9561bed..6fdb07d 100644
--- a/cyaron/__init__.py
+++ b/cyaron/__init__.py
@@ -7,7 +7,7 @@
 from __future__ import absolute_import
 from .io import IO
 from .graph import Graph, Edge
-from .str import String
+from .string import String
 from .sequence import Sequence
 from .utils import *
 from .consts import *
diff --git a/cyaron/str.py b/cyaron/string.py
similarity index 100%
rename from cyaron/str.py
rename to cyaron/string.py
diff --git a/setup.py b/setup.py
index f5b0669..0cac8c4 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='cyaron',
-    version='0.2.7',
+    version='0.2.8',
     keywords='olympic informatics luogu aqours cyaron lovelive sunshine online judge',
     description='CYaRon: Yet Another Random Olympic-iNformatics test data generator, A library for automatically generating test data for Online Judge, Olympic Informatics or automatic application testing',
     license='LGPLv3',