AWS has introduced Lambda MicroVMs, built on its Firecracker virtual machine monitor, which can run isolated Linux containers with runtimes of up to eight hours, in contrast to the 15-minute limit on containers in Lambda functions. Developers provide a Dockerfile defining a container along with application artifacts, and upload it to Amazon S3. AWS presents the primary purpose of MicroVMs as providing an isolated environment for running code, such as inspecting potentially malicious packages, scanning for vulnerabilities, or running AI-generated code while guarding against prompt injection and insecure output. A MicroVM has several possible states, including running, suspended, and terminated, and can automatically scale up to four times the base specification. MicroVM pricing is based on per-second usage of vCPU, RAM (provisioned in a 2:1 GB ratio to vCPU), snapshot storage, and data transfer. At the time of writing, MicroVMs are only available in US East, US West, Tokyo, and Ireland regions, and only Arm-based AWS Graviton instances are supported.