Upgrade from Postgres 9.3 to 9.5
Self-answer from Kevin Struckhoff originally left as a comment:

Finally got back to this task and ran the upgrade successfully.

Turns out, since I use tablespaces in specific directories, the new 9.5 are right next to the old 9.3 dirs:


drwx------ 4 postgres postgres  4096 Oct  4  2014 PG_9.3_201306121
drwx------ 3 postgres postgres  4096 Apr 18 11:49 PG_9.5_201510051