diff --git a/HISTORY.md b/HISTORY.md
index 6f43951c..aa1e3eb6 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -6,6 +6,12 @@ The format is based on [Keep a
 Changelog](https://keepachangelog.com/en/1.0.0/), and this project
 adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [4.1.2](https://github.com/uploadcare/pyuploadcare/compare/v4.1.1...v4.1.2) - 2023-09-08
+
+### Fixed
+
+- Incorrect expiration time was calculated for signed uploads causing the `AuthenticationError: Expired signature` exception.
+
 ## [4.1.1](https://github.com/uploadcare/pyuploadcare/compare/v4.1.0...v4.1.1) - 2023-09-04
 
 ### Fixed
diff --git a/pyproject.toml b/pyproject.toml
index efa8cf44..5afe6047 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pyuploadcare"
-version = "4.1.1"
+version = "4.1.2"
 description = "Python library for Uploadcare.com"
 authors = ["Uploadcare Inc <hello@uploadcare.com>"]
 readme = "README.md"
diff --git a/pyuploadcare/__init__.py b/pyuploadcare/__init__.py
index 1936c695..c269665d 100644
--- a/pyuploadcare/__init__.py
+++ b/pyuploadcare/__init__.py
@@ -1,5 +1,5 @@
 # isort: skip_file
-__version__ = "4.1.1"
+__version__ = "4.1.2"
 
 from pyuploadcare.resources.file import File  # noqa: F401
 from pyuploadcare.resources.file_group import FileGroup  # noqa: F401
diff --git a/pyuploadcare/client.py b/pyuploadcare/client.py
index c9d4be93..84cb6d8e 100644
--- a/pyuploadcare/client.py
+++ b/pyuploadcare/client.py
@@ -1,5 +1,6 @@
 import os
 import socket
+from time import time
 from typing import (
     IO,
     Any,
@@ -373,7 +374,7 @@ def _file_name(file_object, index):
             files=files,
             store=self._format_store(store),
             secure_upload=self.signed_uploads,
-            expire=self.signed_uploads_ttl,
+            expire=int(time()) + self.signed_uploads_ttl,
             common_metadata=common_metadata,
         )
         ucare_files = [self.file(response[file_name]) for file_name in files]
@@ -425,7 +426,7 @@ def multipart_upload(  # noqa: C901
             content_type=mime_type,
             store=self._format_store(store),
             secure_upload=self.signed_uploads,
-            expire=self.signed_uploads_ttl,
+            expire=int(time()) + self.signed_uploads_ttl,
             metadata=metadata,
         )
 
@@ -495,7 +496,7 @@ def upload_from_url(
             filename=filename,
             metadata=metadata,
             secure_upload=self.signed_uploads,
-            expire=self.signed_uploads_ttl,
+            expire=int(time()) + self.signed_uploads_ttl,
             check_duplicates=check_duplicates,
             save_duplicates=save_duplicates,
         )
@@ -647,7 +648,7 @@ def create_file_group(self, files: List[File]) -> FileGroup:
         group_info = self.upload_api.create_group(
             files=file_urls,
             secure_upload=self.signed_uploads,
-            expire=self.signed_uploads_ttl,
+            expire=int(time()) + self.signed_uploads_ttl,
         )
 
         group = self.file_group(group_info["id"], group_info)
diff --git a/tests/functional/resources/test_resources.py b/tests/functional/resources/test_resources.py
index cd2e64be..e6f947d4 100644
--- a/tests/functional/resources/test_resources.py
+++ b/tests/functional/resources/test_resources.py
@@ -1,4 +1,6 @@
 import os
+from datetime import datetime, timedelta
+from unittest.mock import MagicMock, patch
 
 import pytest
 
@@ -134,6 +136,31 @@ def test_file_upload_multiple(small_file, small_file2, uploadcare):
         )
 
 
+@pytest.mark.freeze_time("2021-10-12")
+def test_file_upload_signature(small_file, uploadcare, signed_uploads):
+    assert uploadcare.signed_uploads
+    fake_response = MagicMock()
+    fake_response.json.return_value = {
+        "sample1.txt": "96e0a8f8-91f3-4162-907d-2d67d36ebae8"
+    }
+    with open(small_file.name, "rb") as fh:
+        with patch.object(
+            uploadcare.upload_api._client, "post", return_value=fake_response
+        ) as mocked_post:
+            response = uploadcare.upload(fh)
+
+    assert mocked_post.called
+    data = mocked_post.call_args.kwargs["data"]
+    expected_expire = datetime.now() + timedelta(
+        seconds=uploadcare.signed_uploads_ttl
+    )
+    assert data["expire"] == str(int(expected_expire.timestamp()))
+    assert (
+        data["signature"]
+        == "f7d27174ad85736b9a4ace81a3cf420b99b2ddc78415b00adfc0c326a39cb490"
+    )
+
+
 @pytest.mark.vcr
 def test_file_create_local_copy(uploadcare):
     file = uploadcare.file("35ea470d-216c-4752-91d2-5176b34c1225")