diff --git a/dulwich/client.py b/dulwich/client.py
index b5f5f804..0db532d0 100644
--- a/dulwich/client.py
+++ b/dulwich/client.py
@@ -60,10 +60,6 @@ except ImportError:
     import urllib.request as urllib2
     import urllib.parse as urlparse
 
-import certifi
-import urllib3
-import urllib3.util
-
 import dulwich
 from dulwich.errors import (
     GitProtocolError,
@@ -1260,6 +1256,8 @@ def default_urllib3_manager(config, verify_ssl=True):
     :return: `urllib3.ProxyManager` instance for proxy configurations,
         `urllib3.PoolManager` otherwise.
     """
+    import urllib3
+    import certifi
     proxy_server = user_agent = None
 
     if config is not None:
@@ -1298,6 +1296,7 @@ class HttpGitClient(GitClient):
 
     def __init__(self, base_url, dumb=None, pool_manager=None, config=None,
                  username=None, password=None, **kwargs):
+        import urllib3.util
         self._base_url = base_url.rstrip("/") + "/"
         self._username = username
         self._password = password
diff --git a/dulwich/tests/test_client.py b/dulwich/tests/test_client.py
index eb1ccbea..881fabf5 100644
--- a/dulwich/tests/test_client.py
+++ b/dulwich/tests/test_client.py
@@ -35,8 +35,12 @@ try:
 except ImportError:
     import urllib.parse as urlparse
 
-import certifi
-import urllib3
+if '__pypy__' not in sys.modules:
+    import certifi
+    import urllib3
+else:
+    urllib3 = None
+    certifi = None
 
 import dulwich
 from dulwich import (
@@ -534,12 +538,20 @@ class TestGetTransportAndPath(TestCase):
         self.assertTrue(isinstance(c, SSHGitClient))
 
     def test_http(self):
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
+
         url = 'https://github.com/jelmer/dulwich'
         c, path = get_transport_and_path(url)
         self.assertTrue(isinstance(c, HttpGitClient))
         self.assertEqual('/jelmer/dulwich', path)
 
     def test_http_auth(self):
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
+
         url = 'https://user:passwd@github.com/jelmer/dulwich'
 
         c, path = get_transport_and_path(url)
@@ -550,6 +562,10 @@ class TestGetTransportAndPath(TestCase):
         self.assertEqual('passwd', c._password)
 
     def test_http_no_auth(self):
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
+
         url = 'https://github.com/jelmer/dulwich'
 
         c, path = get_transport_and_path(url)
@@ -632,6 +648,9 @@ class TestGetTransportAndPathFromUrl(TestCase):
             'prospero://bar/baz')
 
     def test_http(self):
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
         url = 'https://github.com/jelmer/dulwich'
         c, path = get_transport_and_path_from_url(url)
         self.assertTrue(isinstance(c, HttpGitClient))
@@ -863,6 +882,11 @@ class LocalGitClientTests(TestCase):
 
 class HttpGitClientTests(TestCase):
 
+    def setUp(self):
+        super(HttpGitClientTests, self).setUp()
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
     @staticmethod
     def b64encode(s):
         """Python 2/3 compatible Base64 encoder. Returns string."""
@@ -961,6 +985,11 @@ class TCPGitClientTests(TestCase):
 
 class DefaultUrllib3ManagerTest(TestCase):
 
+    def setUp(self):
+        super(DefaultUrllib3ManagerTest, self).setUp()
+        if '__pypy__' in sys.modules:
+            self.skipTest('urllib3 not available for pypy in debian')
+
     def assert_verify_ssl(self, manager, assertion=True):
         pool_keywords = tuple(manager.connection_pool_kw.items())
         assert_method = self.assertIn if assertion else self.assertNotIn
@@ -972,6 +1001,7 @@ class DefaultUrllib3ManagerTest(TestCase):
         self.assert_verify_ssl(manager)
 
     def test_config_no_proxy(self):
+
         manager = default_urllib3_manager(config=ConfigDict())
         self.assert_verify_ssl(manager)