diff --git a/taiyangxue/python-op2/requirements.txt b/taiyangxue/python-op2/requirements.txt
index 0f3fed7..8a5c1df 100644
--- a/taiyangxue/python-op2/requirements.txt
+++ b/taiyangxue/python-op2/requirements.txt
@@ -10,7 +10,7 @@ numpy==1.19.1
 pandas==1.1.1
 python-dateutil==2.8.1
 pytz==2020.1
-PyYAML==5.3.1
+PyYAML==5.4
 requests==2.24.0
 six==1.15.0
 ua-parser==0.10.0