Unable to sudo apt install a package

Question

I'm trying to install a json parser package for development in Ubuntu.

When I run sudo apt-get install libcjson-dev it's unable to locate. How to fix this problem?

$ sudo apt-get install libcjson-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libcjson-dev

Thanks for any help!