diff --git a/main.py b/main.py
index 3ee96dd..d454829 100644
--- a/main.py
+++ b/main.py
@@ -29,6 +29,9 @@ class TestTCP(TestCase):
         data = self.sock.recv(1024)
         self.assertEqual(data, b'OK')
 
+    def tearDown(self) -> None:
+        self.sock.close()
+
 
 class TestHTTP(TestCase):