Although it seems Bell skipped updating the BlackBerry Motion in June, they've now released a new software updated labeled as ACA542 to make up for it.
If you haven't downloaded the update yet, go ahead and check now. It just might be there waiting for you as folks in the forums report it started rolling out earlier this morning. All told, the update should come in at just over 150MB, making it a quick download and install. Once installed, your device should show July 5 security patches.
If you're on a different carrier such as Telus or one of Bell's MVNO's, it's also worth checking for the update. Not satisfied with being on the July update? Well, you can also try the August autoloader which is available in the CrackBerry Forums if that's your thing.