diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index c41bb93c..35211583 100644
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -1427,7 +1427,7 @@ def add_auth(ap):
     ap2.add_argument("--no-bauth", action="store_true", help="disable basic-authentication support; do not accept passwords from the 'Authenticate' header at all. NOTE: This breaks support for the android app")
     ap2.add_argument("--bauth-last", action="store_true", help="keeps basic-authentication enabled, but only as a last-resort; if a cookie is also provided then the cookie wins")
     ap2.add_argument("--ses-db", metavar="PATH", type=u, default=ses_db, help="where to store the sessions database (if you run multiple copyparty instances, make sure they use different DBs)")
-    ap2.add_argument("--ses-len", metavar="CHARS", type=int, default=20, help="session key length; default is 120 bits ((20//4)*4*6)")
+    ap2.add_argument("--ses-len", metavar="CHARS", type=int, default=24, help="session key length; default is 144 bits ((24//4)*4*6)")
     ap2.add_argument("--no-ses", action="store_true", help="disable sessions; use plaintext passwords in cookies")
     ap2.add_argument("--grp-all", metavar="NAME", type=u, default="acct", help="the name of the auto-generated group which contains every username which is known")
     ap2.add_argument("--ipu", metavar="CIDR=USR", type=u, action="append", help="\033[34mREPEATABLE:\033[0m users with IP matching \033[33mCIDR\033[0m are auto-authenticated as username \033[33mUSR\033[0m; example: [\033[32m172.16.24.0/24=dave]")