diff --git a/src/obspec/_attributes.py b/src/obspec/_attributes.py
index 13be30b..0aa1f1f 100644
--- a/src/obspec/_attributes.py
+++ b/src/obspec/_attributes.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import sys
+from collections.abc import Mapping
 from typing import Literal, Union
 
 if sys.version_info >= (3, 10):
@@ -45,7 +46,7 @@
 Any other string key specifies a user-defined metadata field for the object.
 """
 
-Attributes: TypeAlias = dict[Attribute, str]
+Attributes: TypeAlias = Mapping[Attribute, str]
 """Additional attributes of an object
 
 Attributes can be specified in [`Put`][obspec.Put]/[`PutAsync`][obspec.PutAsync] and
diff --git a/src/obspec/_put.py b/src/obspec/_put.py
index 3591cdb..5d16f17 100644
--- a/src/obspec/_put.py
+++ b/src/obspec/_put.py
@@ -4,7 +4,13 @@
 
 if TYPE_CHECKING:
     import sys
-    from collections.abc import AsyncIterable, AsyncIterator, Iterable, Iterator
+    from collections.abc import (
+        AsyncIterable,
+        AsyncIterator,
+        Iterable,
+        Iterator,
+        Mapping,
+    )
     from pathlib import Path
 
     from ._attributes import Attributes
@@ -80,7 +86,7 @@ def put(  # noqa: PLR0913
         file: IO[bytes] | Path | bytes | Buffer | Iterator[Buffer] | Iterable[Buffer],
         *,
         attributes: Attributes | None = None,
-        tags: dict[str, str] | None = None,
+        tags: Mapping[str, str] | None = None,
         mode: PutMode | None = None,
         use_multipart: bool | None = None,
         chunk_size: int = ...,
@@ -147,7 +153,7 @@ async def put_async(  # noqa: PLR0913
         | Iterable[Buffer],
         *,
         attributes: Attributes | None = None,
-        tags: dict[str, str] | None = None,
+        tags: Mapping[str, str] | None = None,
         mode: PutMode | None = None,
         use_multipart: bool | None = None,
         chunk_size: int = ...,