diff --git a/src/cryptography/hazmat/primitives/asymmetric/dsa.py b/src/cryptography/hazmat/primitives/asymmetric/dsa.py
index 4d332f2..733a967 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/dsa.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/dsa.py
@@ -71,17 +71,6 @@
         """
 
 
-DSAPrivateKeyWithNumbers = utils.deprecated(
-    DSAPrivateKeyWithSerialization,
-    __name__,
-    (
-        "The DSAPrivateKeyWithNumbers interface has been renamed to "
-        "DSAPrivateKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 @six.add_metaclass(abc.ABCMeta)
 class DSAPublicKey(object):
     @abc.abstractproperty
@@ -118,17 +107,6 @@
         """
 
 
-DSAPublicKeyWithNumbers = utils.deprecated(
-    DSAPublicKeyWithSerialization,
-    __name__,
-    (
-        "The DSAPublicKeyWithNumbers interface has been renamed to "
-        "DSAPublicKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 def generate_parameters(key_size, backend):
     return backend.generate_dsa_parameters(key_size)
 
diff --git a/src/cryptography/hazmat/primitives/asymmetric/ec.py b/src/cryptography/hazmat/primitives/asymmetric/ec.py
index 96809c1..631fcbf 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/ec.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/ec.py
@@ -71,17 +71,6 @@
         """
 
 
-EllipticCurvePrivateKeyWithNumbers = utils.deprecated(
-    EllipticCurvePrivateKeyWithSerialization,
-    __name__,
-    (
-        "The EllipticCurvePrivateKeyWithNumbers interface has been renamed to "
-        "EllipticCurvePrivateKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 @six.add_metaclass(abc.ABCMeta)
 class EllipticCurvePublicKey(object):
     @abc.abstractmethod
@@ -112,17 +101,6 @@
         """
 
 
-EllipticCurvePublicKeyWithNumbers = utils.deprecated(
-    EllipticCurvePublicKeyWithSerialization,
-    __name__,
-    (
-        "The EllipticCurvePublicKeyWithNumbers interface has been renamed to "
-        "EllipticCurvePublicKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 @utils.register_interface(EllipticCurve)
 class SECT571R1(object):
     name = "sect571r1"
diff --git a/src/cryptography/hazmat/primitives/asymmetric/rsa.py b/src/cryptography/hazmat/primitives/asymmetric/rsa.py
index ae00184..772473f 100644
--- a/src/cryptography/hazmat/primitives/asymmetric/rsa.py
+++ b/src/cryptography/hazmat/primitives/asymmetric/rsa.py
@@ -56,17 +56,6 @@
         """
 
 
-RSAPrivateKeyWithNumbers = utils.deprecated(
-    RSAPrivateKeyWithSerialization,
-    __name__,
-    (
-        "The RSAPrivateKeyWithNumbers interface has been renamed to "
-        "RSAPrivateKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 @six.add_metaclass(abc.ABCMeta)
 class RSAPublicKey(object):
     @abc.abstractmethod
@@ -103,17 +92,6 @@
         """
 
 
-RSAPublicKeyWithNumbers = utils.deprecated(
-    RSAPublicKeyWithSerialization,
-    __name__,
-    (
-        "The RSAPublicKeyWithNumbers interface has been renamed to "
-        "RSAPublicKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-
 def generate_private_key(public_exponent, key_size, backend):
     if not isinstance(backend, RSABackend):
         raise UnsupportedAlgorithm(
diff --git a/src/cryptography/hazmat/primitives/interfaces/__init__.py b/src/cryptography/hazmat/primitives/interfaces/__init__.py
index c980e5a..4c95190 100644
--- a/src/cryptography/hazmat/primitives/interfaces/__init__.py
+++ b/src/cryptography/hazmat/primitives/interfaces/__init__.py
@@ -8,357 +8,6 @@
 
 import six
 
-from cryptography import utils
-from cryptography.hazmat.primitives import ciphers, hashes
-from cryptography.hazmat.primitives.asymmetric import (
-    AsymmetricSignatureContext, AsymmetricVerificationContext, dsa, ec,
-    padding, rsa
-)
-from cryptography.hazmat.primitives.ciphers import modes
-from cryptography.hazmat.primitives.kdf import KeyDerivationFunction
-from cryptography.hazmat.primitives.padding import PaddingContext
-
-
-BlockCipherAlgorithm = utils.deprecated(
-    ciphers.BlockCipherAlgorithm,
-    __name__,
-    (
-        "The BlockCipherAlgorithm interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-CipherAlgorithm = utils.deprecated(
-    ciphers.CipherAlgorithm,
-    __name__,
-    (
-        "The CipherAlgorithm interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-Mode = utils.deprecated(
-    modes.Mode,
-    __name__,
-    (
-        "The Mode interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers.modes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-ModeWithAuthenticationTag = utils.deprecated(
-    modes.ModeWithAuthenticationTag,
-    __name__,
-    (
-        "The ModeWithAuthenticationTag interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers.modes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-ModeWithInitializationVector = utils.deprecated(
-    modes.ModeWithInitializationVector,
-    __name__,
-    (
-        "The ModeWithInitializationVector interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers.modes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-ModeWithNonce = utils.deprecated(
-    modes.ModeWithNonce,
-    __name__,
-    (
-        "The ModeWithNonce interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers.modes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-CipherContext = utils.deprecated(
-    ciphers.CipherContext,
-    __name__,
-    (
-        "The CipherContext interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-AEADCipherContext = utils.deprecated(
-    ciphers.AEADCipherContext,
-    __name__,
-    (
-        "The AEADCipherContext interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-AEADEncryptionContext = utils.deprecated(
-    ciphers.AEADEncryptionContext,
-    __name__,
-    (
-        "The AEADEncryptionContext interface has moved to the "
-        "cryptography.hazmat.primitives.ciphers module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurve = utils.deprecated(
-    ec.EllipticCurve,
-    __name__,
-    (
-        "The EllipticCurve interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurvePrivateKey = utils.deprecated(
-    ec.EllipticCurvePrivateKey,
-    __name__,
-    (
-        "The EllipticCurvePrivateKey interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurvePrivateKeyWithNumbers = utils.deprecated(
-    ec.EllipticCurvePrivateKeyWithSerialization,
-    __name__,
-    (
-        "The EllipticCurvePrivateKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurvePublicKey = utils.deprecated(
-    ec.EllipticCurvePublicKey,
-    __name__,
-    (
-        "The EllipticCurvePublicKey interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurvePublicKeyWithNumbers = utils.deprecated(
-    ec.EllipticCurvePublicKeyWithSerialization,
-    __name__,
-    (
-        "The EllipticCurvePublicKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-EllipticCurveSignatureAlgorithm = utils.deprecated(
-    ec.EllipticCurveSignatureAlgorithm,
-    __name__,
-    (
-        "The EllipticCurveSignatureAlgorithm interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.ec module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-DSAParameters = utils.deprecated(
-    dsa.DSAParameters,
-    __name__,
-    (
-        "The DSAParameters interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-DSAParametersWithNumbers = utils.deprecated(
-    dsa.DSAParametersWithNumbers,
-    __name__,
-    (
-        "The DSAParametersWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-DSAPrivateKey = utils.deprecated(
-    dsa.DSAPrivateKey,
-    __name__,
-    (
-        "The DSAPrivateKey interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-DSAPrivateKeyWithNumbers = utils.deprecated(
-    dsa.DSAPrivateKeyWithSerialization,
-    __name__,
-    (
-        "The DSAPrivateKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-DSAPublicKey = utils.deprecated(
-    dsa.DSAPublicKey,
-    __name__,
-    (
-        "The DSAPublicKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-DSAPublicKeyWithNumbers = utils.deprecated(
-    dsa.DSAPublicKeyWithSerialization,
-    __name__,
-    (
-        "The DSAPublicKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.dsa.module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-PaddingContext = utils.deprecated(
-    PaddingContext,
-    __name__,
-    (
-        "The PaddingContext interface has moved to the "
-        "cryptography.hazmat.primitives.padding module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-HashContext = utils.deprecated(
-    hashes.HashContext,
-    __name__,
-    (
-        "The HashContext interface has moved to the "
-        "cryptography.hazmat.primitives.hashes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-HashAlgorithm = utils.deprecated(
-    hashes.HashAlgorithm,
-    __name__,
-    (
-        "The HashAlgorithm interface has moved to the "
-        "cryptography.hazmat.primitives.hashes module"
-    ),
-    utils.DeprecatedIn08
-)
-
-
-RSAPrivateKey = utils.deprecated(
-    rsa.RSAPrivateKey,
-    __name__,
-    (
-        "The RSAPrivateKey interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.rsa module"
-    ),
-    utils.DeprecatedIn08
-)
-
-RSAPrivateKeyWithNumbers = utils.deprecated(
-    rsa.RSAPrivateKeyWithSerialization,
-    __name__,
-    (
-        "The RSAPrivateKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.rsa module and has been "
-        "renamed RSAPrivateKeyWithSerialization"
-    ),
-    utils.DeprecatedIn08
-)
-
-RSAPublicKey = utils.deprecated(
-    rsa.RSAPublicKey,
-    __name__,
-    (
-        "The RSAPublicKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.rsa module"
-    ),
-    utils.DeprecatedIn08
-)
-
-RSAPublicKeyWithNumbers = utils.deprecated(
-    rsa.RSAPublicKeyWithSerialization,
-    __name__,
-    (
-        "The RSAPublicKeyWithNumbers interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.rsa module"
-    ),
-    utils.DeprecatedIn08
-)
-
-AsymmetricPadding = utils.deprecated(
-    padding.AsymmetricPadding,
-    __name__,
-    (
-        "The AsymmetricPadding interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric.padding module"
-    ),
-    utils.DeprecatedIn08
-)
-
-AsymmetricSignatureContext = utils.deprecated(
-    AsymmetricSignatureContext,
-    __name__,
-    (
-        "The AsymmetricPadding interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric module"
-    ),
-    utils.DeprecatedIn08
-)
-
-AsymmetricVerificationContext = utils.deprecated(
-    AsymmetricVerificationContext,
-    __name__,
-    (
-        "The AsymmetricVerificationContext interface has moved to the "
-        "cryptography.hazmat.primitives.asymmetric module"
-    ),
-    utils.DeprecatedIn08
-)
-
-KeyDerivationFunction = utils.deprecated(
-    KeyDerivationFunction,
-    __name__,
-    (
-        "The KeyDerivationFunction interface has moved to the "
-        "cryptography.hazmat.primitives.kdf module"
-    ),
-    utils.DeprecatedIn08
-)
-
 
 @six.add_metaclass(abc.ABCMeta)
 class MACContext(object):
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 445554e..0bf8c0e 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -10,8 +10,7 @@
 import warnings
 
 
-DeprecatedIn08 = DeprecationWarning
-DeprecatedIn09 = PendingDeprecationWarning
+DeprecatedIn09 = DeprecationWarning
 
 
 def read_only_property(name):