How Often Should Businesses Install Security Updates?

Why a single blanket timeline does not work

Treating every patch the same, either rushing all of them out immediately or batching everything into one monthly window regardless of severity, misses the point of prioritization. A critical vulnerability being actively exploited in the wild needs a very different response time than a minor feature update with no known security implications.

A practical cadence by severity

Prioritize internet-facing systems first

Firewalls, remote access gateways, VPN appliances, and any server exposed directly to the internet should always be patched ahead of internal-only workstations, since they represent the systems an attacker can reach without first gaining any foothold inside the network. A patch delayed on an internal workstation for a week is a much smaller risk than the same delay on an internet-facing firewall.

Testing before wide rollout

Applying every patch instantly and untested to every device carries its own risk, since patches occasionally cause compatibility issues with specific line-of-business software. A workable middle ground is deploying to a small pilot group first, even just a handful of non-critical machines, before pushing to the full fleet, particularly for larger feature updates that touch more of the operating system.

Critical, actively exploited vulnerabilities are the exception to this caution: the risk of delaying outweighs the risk of an untested patch in almost every case.

Centralized patch management changes the equation

Relying on individual staff to click through Windows Update prompts on their own schedule produces wildly inconsistent results across a fleet of devices. Centralized patch management, where an IT team pushes updates on a defined schedule and can confirm compliance across every device, is what actually makes a stated patch cadence achievable rather than aspirational.

Do not forget third-party software

• Web browsers, which are frequent targets and update very often
• PDF readers and document viewers
• Remote access and remote support tools
• Line-of-business applications with their own patch cycles
• Firmware on network equipment, including the firewall covered in our article on how often firewall rules should be reviewed

How this connects to cyber insurance and cybersecurity checklists

Patch cadence is one of the specific controls Ontario cyber insurers commonly ask about on applications, and it appears as a line item in our broader small business cybersecurity checklist. Being able to state a clear, followed patch policy rather than an informal best effort is increasingly relevant beyond just the technical benefit.

What good patch management looks like day to day

1. New patches are reviewed daily against severity and exploitation status.
2. Critical patches for internet-facing systems are applied within days, not weeks.
3. Routine patches roll out on a predictable monthly schedule to the full fleet.
4. Patch compliance is tracked centrally so gaps are visible, not assumed away.
5. Third-party software is included in the same discipline as operating system updates.

Sources and further reading

• CISA Known Exploited Vulnerabilities Catalog
• Canadian Centre for Cyber Security

Frequently asked questions