diff --git a/lambda/requirements-deploy.txt b/lambda/requirements-deploy.txt
index 461e7c6..63b6f56 100644
--- a/lambda/requirements-deploy.txt
+++ b/lambda/requirements-deploy.txt
@@ -1,4 +1,4 @@
 aws_kinesis_agg==1.1.3
 aws-xray-sdk==2.6.0
-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 f8cfd18..ffb9351 100644
--- a/lambda/requirements.txt
+++ b/lambda/requirements.txt
@@ -3,5 +3,5 @@ botocore # pyup: ignore
 
 aws_kinesis_agg==1.1.3
 aws-xray-sdk==2.6.0
-python-dateutil==2.8.1
+python-dateutil==2.9.0
 amazon_kinesis_utils==0.1.8