How does jq work with keys containing slash?

My test json file is as follows:

{
   "server":"xxx",
   "cert":"line1nline2",
   "security/path": "/var/log/systems.log"
}

I would like to filter by key security/path, and below commands all don’t work.

jq .security/path test.json
jq: error: path/0 is not defined at <top-level>, line 1:
.security/path
jq: 1 compile error

jq '.security/path' test.json has same result.

$ jq '."security/path"' test.json
"/var/log/systems.log"