diff --git a/src/lithic/_base_client.py b/src/lithic/_base_client.py
index bea3bd66..ea4b067f 100644
--- a/src/lithic/_base_client.py
+++ b/src/lithic/_base_client.py
@@ -793,6 +793,7 @@ def __init__(
         custom_query: Mapping[str, object] | None = None,
         _strict_response_validation: bool,
     ) -> None:
+        kwargs: dict[str, Any] = {}
         if limits is not None:
             warnings.warn(
                 "The `connection_pool_limits` argument is deprecated. The `http_client` argument should be passed instead",
@@ -805,6 +806,7 @@ def __init__(
             limits = DEFAULT_CONNECTION_LIMITS
 
         if transport is not None:
+            kwargs["transport"] = transport
             warnings.warn(
                 "The `transport` argument is deprecated. The `http_client` argument should be passed instead",
                 category=DeprecationWarning,
@@ -814,6 +816,7 @@ def __init__(
                 raise ValueError("The `http_client` argument is mutually exclusive with `transport`")
 
         if proxies is not None:
+            kwargs["proxies"] = proxies
             warnings.warn(
                 "The `proxies` argument is deprecated. The `http_client` argument should be passed instead",
                 category=DeprecationWarning,
@@ -857,10 +860,9 @@ def __init__(
             base_url=base_url,
             # cast to a valid type because mypy doesn't understand our type narrowing
             timeout=cast(Timeout, timeout),
-            proxies=proxies,
-            transport=transport,
             limits=limits,
             follow_redirects=True,
+            **kwargs,  # type: ignore
         )
 
     def is_closed(self) -> bool:
@@ -1373,6 +1375,7 @@ def __init__(
         custom_headers: Mapping[str, str] | None = None,
         custom_query: Mapping[str, object] | None = None,
     ) -> None:
+        kwargs: dict[str, Any] = {}
         if limits is not None:
             warnings.warn(
                 "The `connection_pool_limits` argument is deprecated. The `http_client` argument should be passed instead",
@@ -1385,6 +1388,7 @@ def __init__(
             limits = DEFAULT_CONNECTION_LIMITS
 
         if transport is not None:
+            kwargs["transport"] = transport
             warnings.warn(
                 "The `transport` argument is deprecated. The `http_client` argument should be passed instead",
                 category=DeprecationWarning,
@@ -1394,6 +1398,7 @@ def __init__(
                 raise ValueError("The `http_client` argument is mutually exclusive with `transport`")
 
         if proxies is not None:
+            kwargs["proxies"] = proxies
             warnings.warn(
                 "The `proxies` argument is deprecated. The `http_client` argument should be passed instead",
                 category=DeprecationWarning,
@@ -1437,10 +1442,9 @@ def __init__(
             base_url=base_url,
             # cast to a valid type because mypy doesn't understand our type narrowing
             timeout=cast(Timeout, timeout),
-            proxies=proxies,
-            transport=transport,
             limits=limits,
             follow_redirects=True,
+            **kwargs,  # type: ignore
         )
 
     def is_closed(self) -> bool: