diff --git a/tests/hazmat/primitives/test_dsa.py b/tests/hazmat/primitives/test_dsa.py
index 112818f..bbafbc6 100644
--- a/tests/hazmat/primitives/test_dsa.py
+++ b/tests/hazmat/primitives/test_dsa.py
@@ -75,7 +75,7 @@
             g=vector['g']
         ).parameters(backend)
         skey = parameters.generate_private_key()
-        if isinstance(skey, dsa.DSAPrivateKeyWithNumbers):
+        if isinstance(skey, dsa.DSAPrivateKeyWithSerialization):
             numbers = skey.private_numbers()
             skey_parameters = numbers.public_numbers.parameter_numbers
             pkey = skey.public_key()
@@ -98,7 +98,7 @@
     def test_generate_dsa_private_key_and_parameters(self, backend):
         skey = dsa.generate_private_key(1024, backend)
         assert skey
-        if isinstance(skey, dsa.DSAPrivateKeyWithNumbers):
+        if isinstance(skey, dsa.DSAPrivateKeyWithSerialization):
             numbers = skey.private_numbers()
             skey_parameters = numbers.public_numbers.parameter_numbers
             assert numbers.public_numbers.y == pow(
diff --git a/tests/hazmat/primitives/test_ec.py b/tests/hazmat/primitives/test_ec.py
index 40b1741..23f9aff 100644
--- a/tests/hazmat/primitives/test_ec.py
+++ b/tests/hazmat/primitives/test_ec.py
@@ -173,7 +173,7 @@
         ).private_key(backend)
         assert key
 
-        if isinstance(key, ec.EllipticCurvePrivateKeyWithNumbers):
+        if isinstance(key, ec.EllipticCurvePrivateKeyWithSerialization):
             priv_num = key.private_numbers()
             assert priv_num.private_value == vector['d']
             assert priv_num.public_numbers.x == vector['x']
diff --git a/tests/hazmat/primitives/test_rsa.py b/tests/hazmat/primitives/test_rsa.py
index e6d0ac2..d79d932 100644
--- a/tests/hazmat/primitives/test_rsa.py
+++ b/tests/hazmat/primitives/test_rsa.py
@@ -113,7 +113,7 @@
         skey = rsa.generate_private_key(public_exponent, key_size, backend)
         assert skey.key_size == key_size
 
-        if isinstance(skey, rsa.RSAPrivateKeyWithNumbers):
+        if isinstance(skey, rsa.RSAPrivateKeyWithSerialization):
             _check_rsa_private_numbers(skey.private_numbers())
             pkey = skey.public_key()
             assert isinstance(pkey.public_numbers(), rsa.RSAPublicNumbers)
diff --git a/tests/hazmat/primitives/test_serialization.py b/tests/hazmat/primitives/test_serialization.py
index 07a8f02..22c2145 100644
--- a/tests/hazmat/primitives/test_serialization.py
+++ b/tests/hazmat/primitives/test_serialization.py
@@ -53,7 +53,7 @@
         )
         assert key
         assert isinstance(key, rsa.RSAPrivateKey)
-        if isinstance(key, rsa.RSAPrivateKeyWithNumbers):
+        if isinstance(key, rsa.RSAPrivateKeyWithSerialization):
             _check_rsa_private_numbers(key.private_numbers())
 
     @pytest.mark.requires_backend_interface(interface=DSABackend)
@@ -76,7 +76,7 @@
         )
         assert key
         assert isinstance(key, dsa.DSAPrivateKey)
-        if isinstance(key, dsa.DSAPrivateKeyWithNumbers):
+        if isinstance(key, dsa.DSAPrivateKeyWithSerialization):
             _check_dsa_private_numbers(key.private_numbers())
 
     @pytest.mark.parametrize(
@@ -247,7 +247,7 @@
         )
         assert key
         assert isinstance(key, rsa.RSAPublicKey)
-        if isinstance(key, rsa.RSAPublicKeyWithNumbers):
+        if isinstance(key, rsa.RSAPublicKeyWithSerialization):
             numbers = key.public_numbers()
             assert numbers.e == 65537
 
@@ -330,7 +330,7 @@
 
         assert key
         assert isinstance(key, rsa.RSAPrivateKey)
-        if isinstance(key, rsa.RSAPrivateKeyWithNumbers):
+        if isinstance(key, rsa.RSAPrivateKeyWithSerialization):
             _check_rsa_private_numbers(key.private_numbers())
 
     @pytest.mark.parametrize(
@@ -352,7 +352,7 @@
         )
         assert key
         assert isinstance(key, dsa.DSAPrivateKey)
-        if isinstance(key, dsa.DSAPrivateKeyWithNumbers):
+        if isinstance(key, dsa.DSAPrivateKeyWithSerialization):
             _check_dsa_private_numbers(key.private_numbers())
 
     @pytest.mark.parametrize(
@@ -397,7 +397,7 @@
         )
         assert key
         assert isinstance(key, rsa.RSAPublicKey)
-        if isinstance(key, rsa.RSAPublicKeyWithNumbers):
+        if isinstance(key, rsa.RSAPublicKeyWithSerialization):
             numbers = key.public_numbers()
             assert numbers.e == 65537
 
diff --git a/tests/test_x509.py b/tests/test_x509.py
index 0440832..2a47268 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -353,7 +353,7 @@
         assert isinstance(cert.signature_hash_algorithm, hashes.SHA1)
         public_key = cert.public_key()
         assert isinstance(public_key, dsa.DSAPublicKey)
-        if isinstance(public_key, dsa.DSAPublicKeyWithNumbers):
+        if isinstance(public_key, dsa.DSAPublicKeyWithSerialization):
             num = public_key.public_numbers()
             assert num.y == int(
                 "4c08bfe5f2d76649c80acf7d431f6ae2124b217abc8c9f6aca776ddfa94"
@@ -406,7 +406,7 @@
         assert isinstance(cert.signature_hash_algorithm, hashes.SHA384)
         public_key = cert.public_key()
         assert isinstance(public_key, ec.EllipticCurvePublicKey)
-        if isinstance(public_key, ec.EllipticCurvePublicKeyWithNumbers):
+        if isinstance(public_key, ec.EllipticCurvePublicKeyWithSerialization):
             num = public_key.public_numbers()
             assert num.x == int(
                 "dda7d9bb8ab80bfb0b7f21d2f0bebe73f3335d1abc34eadec69bbcd095f"