In some examples, a method includes, receiving, by a supervisor component, a request to execute particular functionality of an application and, responsive to receiving the request, identifying, by an application container for maintaining installable sub-packages of the application, a minimum version of a library specified in an application definition of the application. The method may also include, responsive to determining that the application container does not include the minimum version of the library: retrieving an instance of the library with a version that is greater than or equal to the minimum version; installing the instance of the library in the container runtime of the application container; and executing the application using the instance of the library in the container.