diff --git a/acme/acme/client.py b/acme/acme/client.py
index a7471a4ec..17ff96e06 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -15,20 +15,12 @@ from typing import Set
 from typing import Text
 from typing import Tuple
 from typing import Union
-import warnings
 
 import josepy as jose
 import OpenSSL
 import requests
 from requests.adapters import HTTPAdapter
 from requests.utils import parse_header_links
-# We're capturing the warnings described at
-# https://github.com/requests/toolbelt/issues/331 until we can remove this
-# dependency in Certbot 2.0.
-with warnings.catch_warnings():
-    warnings.filterwarnings("ignore", "'urllib3.contrib.pyopenssl",
-                            DeprecationWarning)
-    from requests_toolbelt.adapters.source import SourceAddressAdapter
 
 from acme import challenges
 from acme import crypto_util
@@ -489,14 +481,10 @@ class ClientNetwork:
     :param bool verify_ssl: Whether to verify certificates on SSL connections.
     :param str user_agent: String to send as User-Agent header.
     :param float timeout: Timeout for requests.
-    :param source_address: Optional source address to bind to when making
-        requests. (deprecated since 1.30.0)
-    :type source_address: str or tuple(str, int)
     """
     def __init__(self, key: jose.JWK, account: Optional[messages.RegistrationResource] = None,
                  alg: jose.JWASignature = jose.RS256, verify_ssl: bool = True,
-                 user_agent: str = 'acme-python', timeout: int = DEFAULT_NETWORK_TIMEOUT,
-                 source_address: Optional[Union[str, Tuple[str, int]]] = None) -> None:
+                 user_agent: str = 'acme-python', timeout: int = DEFAULT_NETWORK_TIMEOUT) -> None:
         self.key = key
         self.account = account
         self.alg = alg
@@ -507,11 +495,6 @@ class ClientNetwork:
         self._default_timeout = timeout
         adapter = HTTPAdapter()
 
-        if source_address is not None:
-            warnings.warn("Support for source_address is deprecated and will be "
-                          "removed soon.", DeprecationWarning, stacklevel=2)
-            adapter = SourceAddressAdapter(source_address)
-
         self.session.mount("http://", adapter)
         self.session.mount("https://", adapter)
 
diff --git a/acme/setup.py b/acme/setup.py
index 5d88564dd..d71580153 100644
--- a/acme/setup.py
+++ b/acme/setup.py
@@ -12,7 +12,6 @@ install_requires = [
     'pyrfc3339',
     'pytz>=2019.3',
     'requests>=2.20.0',
-    'requests-toolbelt>=0.3.0',
     'setuptools>=41.6.0',
 ]
 
diff --git a/acme/tests/client_test.py b/acme/tests/client_test.py
index c3209685c..093ac519a 100644
--- a/acme/tests/client_test.py
+++ b/acme/tests/client_test.py
@@ -791,32 +791,5 @@ class ClientNetworkWithMockedResponseTest(unittest.TestCase):
         self.net.post('uri', self.obj, content_type=None, new_nonce_url='new_nonce_uri')
 
 
-class ClientNetworkSourceAddressBindingTest(unittest.TestCase):
-    """Tests that if ClientNetwork has a source IP set manually, the underlying library has
-    used the provided source address."""
-
-    def setUp(self):
-        self.source_address = "8.8.8.8"
-
-    def test_source_address_set(self):
-        with mock.patch('warnings.warn') as mock_warn:
-            net = ClientNetwork(key=None, alg=None, source_address=self.source_address)
-            mock_warn.assert_called_once()
-            self.assertIn('source_address', mock_warn.call_args[0][0])
-        for adapter in net.session.adapters.values():
-            self.assertIn(self.source_address, adapter.source_address)
-
-    def test_behavior_assumption(self):
-        """This is a test that guardrails the HTTPAdapter behavior so that if the default for
-        a Session() changes, the assumptions here aren't violated silently."""
-        # Source address not specified, so the default adapter type should be bound -- this
-        # test should fail if the default adapter type is changed by requests
-        net = ClientNetwork(key=None, alg=None)
-        session = requests.Session()
-        for scheme in session.adapters:
-            client_network_adapter = net.session.adapters.get(scheme)
-            default_adapter = session.adapters.get(scheme)
-            self.assertEqual(client_network_adapter.__class__, default_adapter.__class__)
-
 if __name__ == '__main__':
     unittest.main()  # pragma: no cover