diff --git a/pyproject.toml b/pyproject.toml
index 8d0b8072b..f2b80c00e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "cohere"
-version = "5.13.1"
+version = "5.13.2"
 description = ""
 readme = "README.md"
 authors = []
diff --git a/src/cohere/aws_client.py b/src/cohere/aws_client.py
index 26ce11514..8aea9d15c 100644
--- a/src/cohere/aws_client.py
+++ b/src/cohere/aws_client.py
@@ -196,6 +196,13 @@ def _hook(
 
     return _hook
 
+def get_boto3_session(
+    **kwargs: typing.Any,  
+):
+    non_none_args = {k: v for k, v in kwargs.items() if v is not None}
+    return lazy_boto3().Session(**non_none_args)
+
+
 
 def map_request_to_bedrock(
         service: str,
@@ -204,14 +211,15 @@ def map_request_to_bedrock(
         aws_session_token: typing.Optional[str] = None,
         aws_region: typing.Optional[str] = None,
 ) -> EventHook:
-    session = lazy_boto3().Session(
+    session = get_boto3_session(
         region_name=aws_region,
         aws_access_key_id=aws_access_key,
         aws_secret_access_key=aws_secret_key,
         aws_session_token=aws_session_token,
     )
+    aws_region = session.region_name
     credentials = session.get_credentials()
-    signer = lazy_botocore().auth.SigV4Auth(credentials, service, session.region_name)
+    signer = lazy_botocore().auth.SigV4Auth(credentials, service, aws_region)
 
     def _event_hook(request: httpx.Request) -> None:
         headers = request.headers.copy()
diff --git a/src/cohere/core/client_wrapper.py b/src/cohere/core/client_wrapper.py
index fcc6933d6..9fb4430e7 100644
--- a/src/cohere/core/client_wrapper.py
+++ b/src/cohere/core/client_wrapper.py
@@ -24,7 +24,7 @@ def get_headers(self) -> typing.Dict[str, str]:
         headers: typing.Dict[str, str] = {
             "X-Fern-Language": "Python",
             "X-Fern-SDK-Name": "cohere",
-            "X-Fern-SDK-Version": "5.13.1",
+            "X-Fern-SDK-Version": "5.13.2",
         }
         if self._client_name is not None:
             headers["X-Client-Name"] = self._client_name
diff --git a/src/cohere/sagemaker_client.py b/src/cohere/sagemaker_client.py
index 84d20a2ac..77f9f9115 100644
--- a/src/cohere/sagemaker_client.py
+++ b/src/cohere/sagemaker_client.py
@@ -26,7 +26,10 @@ def __init__(
             aws_region=aws_region,
             timeout=timeout,
         )
-        self.sagemaker_finetuning = Client(aws_region=aws_region)
+        try:
+            self.sagemaker_finetuning = Client(aws_region=aws_region)
+        except Exception:
+            pass
 
 
 class SagemakerClientV2(AwsClientV2):
@@ -50,4 +53,7 @@ def __init__(
             aws_region=aws_region,
             timeout=timeout,
         )
-        self.sagemaker_finetuning = Client(aws_region=aws_region)
\ No newline at end of file
+        try:
+            self.sagemaker_finetuning = Client(aws_region=aws_region)
+        except Exception:
+            pass
\ No newline at end of file
diff --git a/tests/test_client_init.py b/tests/test_client_init.py
new file mode 100644
index 000000000..9783b2540
--- /dev/null
+++ b/tests/test_client_init.py
@@ -0,0 +1,16 @@
+import os
+import typing
+import unittest
+
+import cohere
+from cohere import ToolMessage, UserMessage, AssistantMessage
+
+class TestClientInit(unittest.TestCase):
+    def test_inits(self) -> None:
+        cohere.BedrockClient()
+        cohere.BedrockClientV2()
+        cohere.SagemakerClient()
+        cohere.SagemakerClientV2()
+        cohere.Client(api_key="n/a")
+        cohere.ClientV2(api_key="n/a")
+