diff --git a/infrastructure/parallelcluster-ui.yaml b/infrastructure/parallelcluster-ui.yaml
index 1eb77e19..c63262d3 100644
--- a/infrastructure/parallelcluster-ui.yaml
+++ b/infrastructure/parallelcluster-ui.yaml
@@ -693,7 +693,7 @@ Resources:
               cfnresponse.send(event, context, response_status, response_data, physical_resource_id, reason)
 
       Handler: index.handler
-      Runtime: python3.7
+      Runtime: python3.9
       Role: !GetAtt EcrImageDeletionLambdaRole.Arn
 
   EcrImageDeletionLambdaLogGroup: