kernek version problem

i have written a small module :



#define MODULE
#include<linux/module.h>
int init_module(){printk("<1>hello world");return 0;}
void cleanup_module(void){printk"<1>bye world");}

it got compiled without errors.when i'm trying to run
it by insmod:
insmod ./hello.o

i got the error message as:
./hello.o :kernel module version mismatch
./hello.o was compiled for kernel version 2.4.20 while
this kernel is version 2.4.21-4.EL

how do i update my kernel?
is there any way to bypass the kernel version
dependencies? 



                
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