How to update an Android app by only sending the code that changed instead of the whole bundle for each update?

How to update an Android app by only sending the code that changed instead
of the whole bundle for each update?

I have an android app which incorporates a jar file which is 6mb in size.
I want to be able to provide updates to my app without bundling the 6mb
jar for each update, instead only send the application code that changed
for each update. Someone please let me know if this is possible?