diff --git a/requirements.txt b/requirements.txt
index 69d2cc5..b9540b0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,7 +19,7 @@ MarkupSafe==1.1.1
 promise==2.2.1
 pydantic==0.32.2
 python-multipart==0.0.5
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 Rx==1.6.1
 six==1.12.0