Microsoft released a new Servicing stack update to Window Insider program Slow, Fast and Release Preview rings. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). Installing servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft security fixes.