diff --git a/lambda/requirements-deploy.txt b/lambda/requirements-deploy.txt
index dce9105..1442182 100644
--- a/lambda/requirements-deploy.txt
+++ b/lambda/requirements-deploy.txt
@@ -1,5 +1,5 @@
 aws_kinesis_agg==1.1.2
 aws-xray-sdk==2.4.3
-python-dateutil==2.8.1
+python-dateutil==2.9.0
 amazon-kinesis-utils==0.1.8
 
diff --git a/lambda/requirements.txt b/lambda/requirements.txt
index 1656281..71e7d22 100644
--- a/lambda/requirements.txt
+++ b/lambda/requirements.txt
@@ -2,5 +2,5 @@ boto3 # pyup: ignore
 
 aws_kinesis_agg==1.1.2
 aws-xray-sdk==2.4.3
-python-dateutil==2.8.1
+python-dateutil==2.9.0
 amazon-kinesis-utils==0.1.8