diff --git a/lambda/requirements.txt b/lambda/requirements.txt
index 1a25485..e99b5be 100644
--- a/lambda/requirements.txt
+++ b/lambda/requirements.txt
@@ -17,7 +17,7 @@ opt-einsum==3.1.0
 protobuf==3.10.0
 pyasn1==0.4.7
 pyasn1-modules==0.2.7
-PyYAML==5.1.2
+PyYAML==5.4
 requests==2.22.0
 requests-oauthlib==1.2.0
 rsa==4.0