diff --git a/sdk/keyvault/azure-keyvault-certificates/dev_requirements.txt b/sdk/keyvault/azure-keyvault-certificates/dev_requirements.txt
index b9e0c3fa837d..9ec43be16e15 100644
--- a/sdk/keyvault/azure-keyvault-certificates/dev_requirements.txt
+++ b/sdk/keyvault/azure-keyvault-certificates/dev_requirements.txt
@@ -5,4 +5,5 @@
 aiohttp>=3.0
 parameterized>=0.7.3
 python-dateutil>=2.8.0
-pyopenssl
\ No newline at end of file
+pyopenssl
+cryptography>=44.0.2,<47.0.0
\ No newline at end of file
diff --git a/sdk/keyvault/azure-keyvault-certificates/pyproject.toml b/sdk/keyvault/azure-keyvault-certificates/pyproject.toml
index 1e1c725ee585..e4ad0b71451b 100644
--- a/sdk/keyvault/azure-keyvault-certificates/pyproject.toml
+++ b/sdk/keyvault/azure-keyvault-certificates/pyproject.toml
@@ -93,6 +93,7 @@ dev = [
     "azure-identity",
     "azure-keyvault-nspkg",
     "azure-sdk-tools",
+    "cryptography>=44.0.2,<47.0.0",
     "parameterized>=0.7.3",
     "pyopenssl",
     "python-dateutil>=2.8.0",
diff --git a/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py b/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py
index b0c6b4138afd..99d6409a2666 100644
--- a/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py
+++ b/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/_models.py
@@ -252,11 +252,11 @@ def recovery_level(self) -> Optional[str]:
         return self._attributes.recovery_level if self._attributes else None
 
     @property
-    def tags(self) -> Dict[str, str]:
+    def tags(self) -> Optional[Dict[str, str]]:
         """Application specific metadata in the form of key-value pairs.
 
         :returns: A dictionary of tags attached to the key.
-        :rtype: dict[str, str]
+        :rtype: dict[str, str] or None
         """
         return self._tags
 
diff --git a/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/crypto/_models.py b/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/crypto/_models.py
index c16d5811f7e9..cbd65e4da0e7 100644
--- a/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/crypto/_models.py
+++ b/sdk/keyvault/azure-keyvault-keys/azure/keyvault/keys/crypto/_models.py
@@ -317,7 +317,16 @@ def __copy__(self) -> KeyVaultRSAPublicKey:
         """
         return self
 
-    def verifier(  # pylint:disable=docstring-missing-param,docstring-missing-return,docstring-missing-rtype
+    def __deepcopy__(self, memo: dict) -> KeyVaultRSAPublicKey:
+        """Returns this instance since it is treated as immutable.
+
+        :param dict memo: The memo dictionary used by deepcopy.
+        :returns: This instance.
+        :rtype: ~azure.keyvault.keys.crypto.KeyVaultRSAPublicKey
+        """
+        return self
+
+    def verifier(# pylint:disable=docstring-missing-param,docstring-missing-return,docstring-missing-rtype
         self, signature: bytes, padding: AsymmetricPadding, algorithm: HashAlgorithm
     ) -> NoReturn:
         """Not implemented. This method was deprecated in `cryptography` 2.0 and removed in 37.0.0."""
@@ -499,6 +508,15 @@ def __copy__(self) -> KeyVaultRSAPrivateKey:
         """
         return self
 
+    def __deepcopy__(self, memo: dict) -> KeyVaultRSAPrivateKey:
+        """Returns this instance since it is treated as immutable.
+
+        :param dict memo: The memo dictionary used by deepcopy.
+        :returns: This instance.
+        :rtype: ~azure.keyvault.keys.crypto.KeyVaultRSAPrivateKey
+        """
+        return self
+
 
 class DecryptResult:
     """The result of a decrypt operation.
diff --git a/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt b/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
index 839e9f8c0109..2dd2a406a66c 100644
--- a/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
+++ b/sdk/keyvault/azure-keyvault-keys/dev_requirements.txt
@@ -4,5 +4,6 @@
 aiohttp>=3.0
 azure-identity
 azure-mgmt-keyvault==10.1.0
+cryptography<47.0.0
 parameterized>=0.7.3
 python-dateutil>=2.8.0
\ No newline at end of file
diff --git a/sdk/keyvault/azure-keyvault-keys/tests/conftest.py b/sdk/keyvault/azure-keyvault-keys/tests/conftest.py
index bfcd18356825..32b2c439318a 100644
--- a/sdk/keyvault/azure-keyvault-keys/tests/conftest.py
+++ b/sdk/keyvault/azure-keyvault-keys/tests/conftest.py
@@ -82,6 +82,6 @@ def immediate_return(_):
 
 @pytest.fixture(scope="session")
 def event_loop(request):
-    loop = asyncio.get_event_loop()
+    loop = asyncio.new_event_loop()
     yield loop
     loop.close()