diff --git a/acme/acme/challenges.py b/acme/acme/challenges.py
index 501f74881..29b9bbb50 100644
--- a/acme/acme/challenges.py
+++ b/acme/acme/challenges.py
@@ -308,7 +308,7 @@ class HTTP01Response(KeyAuthorizationChallengeResponse):
         uri = chall.uri(domain)
         logger.debug("Verifying %s at %s...", chall.typ, uri)
         try:
-            http_response = requests.get(uri)
+            http_response = requests.get(uri, verify=False)
         except requests.exceptions.RequestException as error:
             logger.error("Unable to reach %s: %s", uri, error)
             return False
diff --git a/acme/acme/challenges_test.py b/acme/acme/challenges_test.py
index 81d39058e..be15e5b1a 100644
--- a/acme/acme/challenges_test.py
+++ b/acme/acme/challenges_test.py
@@ -186,7 +186,7 @@ class HTTP01ResponseTest(unittest.TestCase):
         mock_get.return_value = mock.MagicMock(text=validation)
         self.assertTrue(self.response.simple_verify(
             self.chall, "local", KEY.public_key()))
-        mock_get.assert_called_once_with(self.chall.uri("local"))
+        mock_get.assert_called_once_with(self.chall.uri("local"), verify=False)
 
     @mock.patch("acme.challenges.requests.get")
     def test_simple_verify_bad_validation(self, mock_get):
@@ -202,7 +202,7 @@ class HTTP01ResponseTest(unittest.TestCase):
                   HTTP01Response.WHITESPACE_CUTSET))
         self.assertTrue(self.response.simple_verify(
             self.chall, "local", KEY.public_key()))
-        mock_get.assert_called_once_with(self.chall.uri("local"))
+        mock_get.assert_called_once_with(self.chall.uri("local"), verify=False)
 
     @mock.patch("acme.challenges.requests.get")
     def test_simple_verify_connection_error(self, mock_get):