diff --git a/CHANGELOG.md b/CHANGELOG.md
index 99066400..059ece78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.1.0.post1 - 2025.01.10
+- fix
+    - fix `pickle.load` `S3UnknownError` bug
+
 ## 4.1.0 - 2025.01.09
 - **breaking change**
     - Remove the `followlinks` parameter from `hdfs_listdir`, `hdfs_load_from`, `hdfs_scandir`, `HdfsPath.load`, `HdfsPath.scandir`, and keep the behavior as `followlinks=False`.
diff --git a/megfile/version.py b/megfile/version.py
index 83241484..c03a0ea3 100644
--- a/megfile/version.py
+++ b/megfile/version.py
@@ -1 +1 @@
-VERSION = "4.1.0"
+VERSION = "4.1.0.post1"
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7b8366d4..5f5fc170 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -22,7 +22,7 @@ sphinxcontrib-jquery
 sphinx_click
 
 # format
-ruff ~= 0.9.0
+ruff
 black  # for E501
 
 # static check