Install httpd-devel on CentOS 5.7 x86_64

I'm trying to install httpd-devel on my Media Temple DV 4 server. I tried this:

yum install -y httpd-devel

But the install fails with:

--> Missing Dependency: httpd = 2.2.3-53.el5.centos.3 is needed by package httpd-devel-2.2.3-53.el5.centos.3.i386 (updates)

So that seems to indicate that I need a newer version of httpd. So I checked my httpd version. I checked my current version:

# yum info httpd
...
Installed Packages
Name       : httpd
Arch       : x86_64
Epoch      : 1
Version    : 2.2.19
Release    : 11072010
...

Ok so httpd-devel was asking for 2.2.3-53 but I only have 2.2.19. So I try to update httpd:

# yum update httpd
....
No Packages marked for Update

So with my limited knowledge I'm stuck, I can't install httpd-devel because it requires a newer version of httpd. But I can't update httpd because no packages are marked for update.

Thanks so much if anyone is able to point me in the right direction on this one.