diff --git a/infrastructure/applications/pretix/cache.tf b/infrastructure/applications/pretix/cache.tf
index 503fad864b..14f0a43dc1 100644
--- a/infrastructure/applications/pretix/cache.tf
+++ b/infrastructure/applications/pretix/cache.tf
@@ -23,3 +23,24 @@ resource "aws_elasticache_cluster" "cache" {
     ignore_changes = [engine_version]
   }
 }
+
+data "aws_ami" "ecs_arm" {
+  most_recent = true
+
+  filter {
+    name   = "name"
+    values = ["al2023-ami-ecs-hvm-2023.0.20240328-kernel-6.1-arm64"]
+  }
+
+  filter {
+    name   = "virtualization-type"
+    values = ["hvm"]
+  }
+
+  filter {
+    name   = "architecture"
+    values = ["arm64"]
+  }
+
+  owners = ["amazon"]
+}
diff --git a/infrastructure/applications/pretix/main.tf b/infrastructure/applications/pretix/main.tf
index 3c79f6723f..9ad7b5f09c 100644
--- a/infrastructure/applications/pretix/main.tf
+++ b/infrastructure/applications/pretix/main.tf
@@ -88,8 +88,7 @@ resource "aws_ecs_task_definition" "pretix_service" {
     {
       name      = "pretix"
       image     = "${data.aws_ecr_repository.repo.repository_url}@${data.aws_ecr_image.image.image_digest}"
-      cpu       = 2048
-      memory    = 1900
+      memoryReservation    = 1900
       essential = true
       environment = [
         {
diff --git a/infrastructure/applications/pretix/vpc.tf b/infrastructure/applications/pretix/vpc.tf
index 974ce32fd6..75df0c47e8 100644
--- a/infrastructure/applications/pretix/vpc.tf
+++ b/infrastructure/applications/pretix/vpc.tf
@@ -23,6 +23,20 @@ data "aws_subnet" "public" {
   }
 }
 
+data "aws_subnet" "private" {
+  vpc_id = data.aws_vpc.default.id
+
+  filter {
+    name   = "tag:Type"
+    values = ["private"]
+  }
+
+  filter {
+    name   = "tag:AZ"
+    values = ["eu-central-1a"]
+  }
+}
+
 data "aws_subnets" "private" {
   filter {
     name   = "vpc-id"
diff --git a/infrastructure/applications/pycon_backend/worker.tf b/infrastructure/applications/pycon_backend/worker.tf
index 5d83a41874..8600473e75 100644
--- a/infrastructure/applications/pycon_backend/worker.tf
+++ b/infrastructure/applications/pycon_backend/worker.tf
@@ -229,7 +229,7 @@ data "template_file" "user_data" {
 
 resource "aws_instance" "instance_1" {
   ami               = data.aws_ami.ecs.id
-  instance_type     = "t4g.nano"
+  instance_type     = "t4g.micro"
   subnet_id         = data.aws_subnet.private_1a.id
   availability_zone = "eu-central-1a"
   vpc_security_group_ids = [
@@ -247,26 +247,6 @@ resource "aws_instance" "instance_1" {
   }
 }
 
-resource "aws_instance" "instance_2" {
-  ami               = data.aws_ami.ecs.id
-  instance_type     = "t4g.nano"
-  subnet_id         = data.aws_subnet.private_1a.id
-  availability_zone = "eu-central-1a"
-  vpc_security_group_ids = [
-    data.aws_security_group.rds.id,
-    data.aws_security_group.lambda.id,
-    aws_security_group.instance.id
-  ]
-  source_dest_check    = false
-  user_data            = data.template_file.user_data.rendered
-  iam_instance_profile = aws_iam_instance_profile.worker.name
-  key_name             = "pretix"
-
-  tags = {
-    Name = "pythonit-${terraform.workspace}-worker-2"
-  }
-}
-
 resource "aws_cloudwatch_log_group" "worker_logs" {
   name              = "/ecs/pythonit-${terraform.workspace}-worker"
   retention_in_days = 7
@@ -279,8 +259,7 @@ resource "aws_ecs_task_definition" "worker" {
     {
       name      = "worker"
       image     = "${data.aws_ecr_repository.be_repo.repository_url}@${data.aws_ecr_image.be_arm_image.image_digest}"
-      cpu       = 2048
-      memory    = 400
+      memoryReservation    = 400
       essential = true
       entrypoint = [
         "/home/app/.venv/bin/celery",
@@ -333,8 +312,7 @@ resource "aws_ecs_task_definition" "beat" {
     {
       name      = "beat"
       image     = "${data.aws_ecr_repository.be_repo.repository_url}@${data.aws_ecr_image.be_arm_image.image_digest}"
-      cpu       = 2048
-      memory    = 400
+      memoryReservation    = 400
       essential = true
       entrypoint = [
         "/home/app/.venv/bin/celery",