diff --git a/requirement-dev.txt b/requirement-dev.txt
index defd055..9363cf9 100644
--- a/requirement-dev.txt
+++ b/requirement-dev.txt
@@ -2,5 +2,5 @@ yapf==0.23.0
 twine==1.11.0
 bumpversion==0.5.3
 pytest==3.7.4
-oss2==2.5.0
+oss2==2.13.1
 pycryptodome==3.6.6