diff --git a/serverless.yml b/serverless.yml
index d0f44ff8..ea6c95e5 100644
--- a/serverless.yml
+++ b/serverless.yml
@@ -62,7 +62,6 @@ functions:
     timeout: 900
     memorySize: 3008
     role: EngineLambdaRole
-    reservedConcurrency: 5
     events:
       - sqs:
           arn: arn:aws:sqs:${self:provider.region}:${aws:accountId}:model-engine-queue
@@ -77,6 +76,7 @@ resources:
       Properties:
         QueueName: model-engine-queue
         VisibilityTimeout: 910 # must be >= lambda timeout (900)
+        maximumConcurrency: 2
 
     FastApiLambdaRole:
       Type: AWS::IAM::Role