yep in the fridge. Since I store them in my everyday fridge and I open it often I have them in a small dark container inside a larger container to avoid temperature fluctuations. Also I like to put silica packs in with them to ensure no moisture gets to them. When you go to get your seeds make it quick to avoid condensation.
I have seeds sitting in a baggie in the basement from 20 years ago, and their still white inside. The last time I started any of those seeds was 4 years ago and every seed popped.