The iPhone 6s is expected to look almost identical to last year’s iPhone 6, but Apple may still tweak the dimensions a little bit. Newly leaked photos sent to MacRumors suggest the upcoming handset could be slightly thicker, wider and taller than its predecessor.

The images show a copy of the iPhone 6s assembled from factory parts, potentially offering our best look yet at the device. To the naked eye it looks like nothing has changed, but detailed measurements of the device reveal that isn’t exactly true.

The iPhone 6s is slightly thicker, coming in at 7.08mm compared to the 6.9mm iPhone 6. It’s also taller and wider at 138.19mm by 67.68mm. Again, that’s small bump from the previous 138.1mm by 67mm dimensions. We assume the iPhone 6s Plus will receive a similar increase in size.

We’re still not sure exactly why Apple is making these new models thicker, though there are a few obvious reasons. The iPhone 6s and iPhone 6s Plus are expected to feature a sturdier shell and a new type of aluminum specifically designed to avoid another “Bendgate” fiasco. The addition of Force Touch sensors in the display could also take up some extra space.

MacRumors notes that most iPhone 6 cases will still work just fine with the iPhone 6s, though tight-fitting accessories may not make the cut. Some case makers, including Spigen, have already revealed new accessories based off these updated dimensions, suggesting that this isn’t just a rumor.

Thankfully we won’t have to wait long to find out. Apple is expected to unveil the iPhone 6s and iPhone 6s Plus at an event set for next week on September 9.