diff --git a/stripe/_http_client.py b/stripe/_http_client.py
index 4fb246523..132ce4eaa 100644
--- a/stripe/_http_client.py
+++ b/stripe/_http_client.py
@@ -1,4 +1,5 @@
 from io import BytesIO
+import atexit
 import textwrap
 import email
 import time
@@ -603,6 +604,7 @@ def __init__(
             _lib = requests
 
         self.requests = _lib
+        atexit.register(self.close)
 
     def request(
         self,