diff --git a/requirements.txt b/requirements.txt
index 4f854b7..8090a21 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ murmurhash==1.0.2
 numpy==1.16.4
 pandas==0.24.2
 python-Levenshtein==0.12.0
-PyYAML==5.1.1
+PyYAML==5.4
 scikit-learn==0.21.2
 sklearn-crfsuite==0.3.6
 python-dateutil==2.8.0