diff --git a/python/requirement.txt b/python/requirement.txt
index dd031bd..9a9df2e 100644
--- a/python/requirement.txt
+++ b/python/requirement.txt
@@ -1,3 +1,2 @@
 binarytree
-unittest2
 parameterized
diff --git a/python/testcases.py b/python/testcases.py
index 51102a6..c5094b3 100644
--- a/python/testcases.py
+++ b/python/testcases.py
@@ -1,4 +1,4 @@
-import unittest2 as unittest
+import unittest as unittest
 
 from binarytree import build
 from parameterized import parameterized