diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d6ce4cb6..993d12b9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "5.35.0"
+  ".": "5.35.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eea7e8b5..c0c98897 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 5.35.1 (2026-05-09)
+
+Full Changelog: [v5.35.0...v5.35.1](https://github.com/RetellAI/retell-python-sdk/compare/v5.35.0...v5.35.1)
+
+### Bug Fixes
+
+* **client:** add missing f-string prefix in file type error message ([291d6f4](https://github.com/RetellAI/retell-python-sdk/commit/291d6f41f0ebe9b8de3fb0e148218495098c959b))
+
 ## 5.35.0 (2026-05-08)
 
 Full Changelog: [v5.34.0...v5.35.0](https://github.com/RetellAI/retell-python-sdk/compare/v5.34.0...v5.35.0)
diff --git a/pyproject.toml b/pyproject.toml
index 5940e80c..377dc9f4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "retell-sdk"
-version = "5.35.0"
+version = "5.35.1"
 description = "The official Python library for the retell API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/retell/_files.py b/src/retell/_files.py
index 0fdce17b..76da9e08 100644
--- a/src/retell/_files.py
+++ b/src/retell/_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/retell/_version.py b/src/retell/_version.py
index 28739dea..472c1421 100644
--- a/src/retell/_version.py
+++ b/src/retell/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "retell"
-__version__ = "5.35.0"  # x-release-please-version
+__version__ = "5.35.1"  # x-release-please-version