Palo Alto Networks surely loves to buy security startups. Today it added to its growing collection when it announced its intent to acquire IoT security startup Zingbox for $75 million.

The company had raised $23.5 million, according to Crunchbase data. The three co-founders, Xu Zou, May Wang and Jianlin Zeng, will be joining Palo Alto after the sale is official.

With Zingbox, the company gets IoT security chops, something that is increasingly important as companies deploy internet-connected smart devices and sensors. While these tools can greatly benefit customers, they also often carry a huge security risk.

Zingbox, which was founded in 2014, gives Palo Alto a modern cloud-based solution built on a subscription model along with engineering talent to help build out the solution further. Nikesh Arora, chairman and CEO of Palo Alto Networks, certainly sees this.

“The proliferation of IoT devices in enterprises has left customers facing an enormous gap in protection against cybersecurity attacks. With the proposed acquisition of Zingbox, we will provide a first-of-its-kind subscription for our Next-Generation Firewall and Cortex platforms that gives customers the ability to gain control, visibility and security of their connected devices at scale,” Arora said in a statement.

This is the fourth security startup the company has purchased this year. It acquired two companies, nabbing PureSec and Twistlock, on the same day last Spring. Earlier this year, it bought Demisto for $560 million. All of these acquisitions are meant to build up the company’s portfolio of modern security offerings without having to build these kinds of tools in-house from scratch.