diff --git a/README.md b/README.md
index ec62f83..c72e2ce 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,10 @@
 
 # 更新日志
 
+## `v2.6.2`
+
+- 修复文件后缀非小写导致的误判问题[#92](https://github.com/rachpt/lanzou-gui/issues/92)
+
 ## `v2.6.1`
 
 - 修复下载某些 txt 文件失败的问题[#53](https://github.com/zaxtyson/LanZouCloud-API/issues/53)
diff --git a/lanzou/api/__init__.py b/lanzou/api/__init__.py
index 7faba86..40f9cea 100644
--- a/lanzou/api/__init__.py
+++ b/lanzou/api/__init__.py
@@ -1,5 +1,5 @@
 from lanzou.api.core import LanZouCloud
 
-version = '2.6.1'
+version = '2.6.2'
 
 __all__ = ['utils', 'types', 'models', 'LanZouCloud', 'version']
diff --git a/lanzou/api/utils.py b/lanzou/api/utils.py
index b5d94af..3ee1a58 100644
--- a/lanzou/api/utils.py
+++ b/lanzou/api/utils.py
@@ -73,7 +73,7 @@ def is_name_valid(filename: str) -> bool:
         'xmind', 'enc', 'bds', 'bdi', 'ssf', 'it', 'gz'
     )
 
-    return filename.split('.')[-1] in valid_suffix_list
+    return filename.split('.')[-1].lower() in valid_suffix_list
 
 
 def is_file_url(share_url: str) -> bool: