diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 0bb2e42..fd0314e 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.38.0"
+  ".": "3.38.1"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 485cf29..4ef50cc 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 26
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/supermemory--inc/supermemory-new-5e1ac142b427e15ca46d0920c4d65c6e1f464e46ce014e42cd5a716f97b820ab.yml
-openapi_spec_hash: f0d9f62796cf1fb5dd79dad7b1c692fd
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/supermemory--inc/supermemory-new-2ff6bdf7a8a1ec4f52d4e762d5b2366bd80f5812cc23223a5d21069a183e158b.yml
+openapi_spec_hash: 310e7f11a2add89f843068364f80463c
 config_hash: cde97ef3188581c5f4924c633ec33ddb
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bad0e98..4f771e4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 3.38.1 (2026-05-09)
+
+Full Changelog: [v3.38.0...v3.38.1](https://github.com/supermemoryai/python-sdk/compare/v3.38.0...v3.38.1)
+
+### Bug Fixes
+
+* **client:** add missing f-string prefix in file type error message ([cf16be5](https://github.com/supermemoryai/python-sdk/commit/cf16be5581f916f4de1477f0d4d8bc8782fe009d))
+
 ## 3.38.0 (2026-05-08)
 
 Full Changelog: [v3.37.0...v3.38.0](https://github.com/supermemoryai/python-sdk/compare/v3.37.0...v3.38.0)
diff --git a/pyproject.toml b/pyproject.toml
index 3de4295..5002a9a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "supermemory"
-version = "3.38.0"
+version = "3.38.1"
 description = "The official Python library for the supermemory API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/supermemory/_files.py b/src/supermemory/_files.py
index 2378358..5e737df 100644
--- a/src/supermemory/_files.py
+++ b/src/supermemory/_files.py
@@ -99,7 +99,7 @@ async def async_to_httpx_files(files: RequestFiles | None) -> HttpxRequestFiles
     elif is_sequence_t(files):
         files = [(key, await _async_transform_file(file)) for key, file in files]
     else:
-        raise TypeError("Unexpected file type input {type(files)}, expected mapping or sequence")
+        raise TypeError(f"Unexpected file type input {type(files)}, expected mapping or sequence")
 
     return files
 
diff --git a/src/supermemory/_version.py b/src/supermemory/_version.py
index 15c5a2a..346501d 100644
--- a/src/supermemory/_version.py
+++ b/src/supermemory/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "supermemory"
-__version__ = "3.38.0"  # x-release-please-version
+__version__ = "3.38.1"  # x-release-please-version