diff --git a/vdirsyncer/utils/__init__.py b/vdirsyncer/utils/__init__.py
index fcf22be..f167d78 100644
--- a/vdirsyncer/utils/__init__.py
+++ b/vdirsyncer/utils/__init__.py
@@ -5,7 +5,6 @@ import sys
 import threading
 
 import requests
-from requests.packages.urllib3.poolmanager import PoolManager
 
 from .compat import iteritems, urlparse
 from .. import exceptions, log
@@ -166,18 +165,6 @@ def _password_from_command(username, host):
                        format(' '.join(command), str(e)))
 
 
-class _FingerprintAdapter(requests.adapters.HTTPAdapter):
-    def __init__(self, fingerprint=None, **kwargs):
-        self.fingerprint = str(fingerprint)
-        super(_FingerprintAdapter, self).__init__(**kwargs)
-
-    def init_poolmanager(self, connections, maxsize, block=False):
-        self.poolmanager = PoolManager(num_pools=connections,
-                                       maxsize=maxsize,
-                                       block=block,
-                                       assert_fingerprint=self.fingerprint)
-
-
 def _verify_fingerprint_works():
     try:
         import requests