As Sparky is shipped with Debian's Linux kernel as default, there is the latest stable version of Linux kernel available to install from Sparky “unstable” repository too.

To get the latest Sparky's Linux kernel, activate Sparky “unstable” repository.

Then update package list:

 sudo apt-get update

Then install a meta package which download and install Sparky's kernel.

amd64:

 sudo apt-get install linux-image-sparky-amd64

686-pae:

 sudo apt-get install linux-image-sparky-686-pae

Linux headers can be installed via meta packages too.

amd64:

 sudo apt-get install linux-headers-sparky-amd64

686-pae:

 sudo apt-get install linux-headers-sparky-686-pae