diff --git a/x86-Architecture/cfn-templates/open5gs-worker-x86.yaml b/x86-Architecture/cfn-templates/open5gs-worker-x86.yaml
index a3280e4..53045b2 100644
--- a/x86-Architecture/cfn-templates/open5gs-worker-x86.yaml
+++ b/x86-Architecture/cfn-templates/open5gs-worker-x86.yaml
@@ -652,6 +652,7 @@ Resources:
                 "ec2:DescribeInstances",
                 "ec2:DetachNetworkInterface",
                 "ec2:ModifyNetworkInterfaceAttribute",
+                "ec2:DescribeSubnets",
                 "autoscaling:CompleteLifecycleAction",
                 "ec2:DeleteTags",
                 "ec2:DescribeNetworkInterfaces",
@@ -675,7 +676,7 @@ Resources:
   LambdaAttach2ndENI:
     Type: "AWS::Lambda::Function"
     Properties:
-      Runtime: "python2.7"
+      Runtime: "python3.8"
       Handler: "lambda_function.lambda_handler"
       Role: !GetAtt RoleLambdaAttach2ndEniCfn.Arn
       Code:
@@ -684,18 +685,8 @@ Resources:
       Timeout: "60"
       Environment:
         Variables:
-          SubnetId1:
-            Fn::ImportValue:
-              !Sub "${InfraStackName}-MultusSubnet1Az1"
-          SubnetId2:
-            Fn::ImportValue:
-              !Sub "${InfraStackName}-MultusSubnet2Az1"
-          SecGroupId1:
-            Fn::ImportValue:
-              !Sub "${InfraStackName}-MultusSecurityGroup"
-          SecGroupId2:
-            Fn::ImportValue:
-              !Sub "${InfraStackName}-MultusSecurityGroup"
+          SubnetIds: !Join [",", [Fn::ImportValue: !Sub "${InfraStackName}-MultusSubnet1Az1", Fn::ImportValue: !Sub "${InfraStackName}-MultusSubnet2Az1"]]
+          SecGroupIds: !Join [",", [Fn::ImportValue: !Sub "${InfraStackName}-MultusSecurityGroup"]]
 # End of Lambda
 
 # CloudWatch Event Trigger
@@ -756,7 +747,7 @@ Resources:
               cfnresponse.send(event, context, cfnresponse.SUCCESS, responseData, "CustomResourcePhysicalID")
 
       Handler: index.handler
-      Runtime: "python3.6"
+      Runtime: "python3.8"
       Timeout: "60"
       Role: !GetAtt RoleLambdaAttach2ndEniCfn.Arn