diff --git a/requirements.txt b/requirements.txt
index be235a5..20f122e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,4 +5,4 @@ jieba==0.42.1
 numpy==1.18.4
 pnlp==0.21
 pybind11==2.5.0
-PyYAML==5.3.1
+PyYAML==5.4