diff --git a/README.md b/README.md
index a8acb08..119fe00 100644
--- a/README.md
+++ b/README.md
@@ -412,7 +412,7 @@ client library prefers.
 
 # CLI
 
-Pathy command line interface. (v0.5.1)
+Pathy command line interface. (v0.5.2)
 
 **Usage**:
 
diff --git a/pathy/s3.py b/pathy/s3.py
index 1ab8e01..53ef710 100644
--- a/pathy/s3.py
+++ b/pathy/s3.py
@@ -112,11 +112,13 @@ def exists(self) -> bool:
 
 class BucketClientS3(BucketClient):
     client: S3NativeClient
-    _session: Optional[Any]
+    _session: Optional[boto3.Session]
 
     @property
     def client_params(self) -> Dict[str, Any]:
-        return dict() if self._session is None else dict(session=self._session)
+        session: Any = self._session
+        result: Any = dict() if session is None else dict(client=session.client("s3"))
+        return result
 
     def __init__(self, **kwargs: Any) -> None:
         self.recreate(**kwargs)
diff --git a/requirements.txt b/requirements.txt
index f948ca7..a6516e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,3 @@
-smart-open>=2.2.0,<4.0.0
+smart-open>=5.0.0,<6.0.0
 typer>=0.3.0,<1.0.0
 dataclasses>=0.6,<1.0; python_version < "3.7"
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