Postgresql 9.2 pg_dump version mismatch

I encountered this while using Heroku on Ubuntu, and here's how I fixed it:

1. Add the PostgreSQL apt repository as described at "Linux downloads (Ubuntu) ". (There are similar pages for other operating systems.)

2. Upgrade to the latest version (9.3 for me) with:

   sudo apt-get install postgresql
   

3. Recreate the symbolic link in /usr/bin with:

   sudo ln -s /usr/lib/postgresql/9.3/bin/pg_dump /usr/bin/pg_dump --force
   

   The version number in the /usr/lib/postgresql/... path above should match the server version number in the error you received. So if your error says, pg_dump: server version: 9.9, then link to /usr/lib/postgresql/9.9/....

1. Check the installed version(s) of pg_dump:

   find / -name pg_dump -type f 2>/dev/null
   

2. My output was:

   /usr/pgsql-9.3/bin/pg_dump
   /usr/bin/pg_dump
   

3. There are two versions installed. To update pg_dump with the newer version:

   sudo ln -s /usr/pgsql-9.3/bin/pg_dump /usr/bin/pg_dump --force
   

This will create the symlink to the newer version.