Incompatible with old version of GNU timeout

There is no option -k in timeout (GNU coreutils) 8.4, which is the default of Redhat 6.5:
# timeout --version
timeout (GNU coreutils) 8.4
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Pádraig Brady.

# timeout --help
Usage: timeout [OPTION] NUMBER[SUFFIX] COMMAND [ARG]...
  or: timeout [OPTION]
Start COMMAND, and kill it if still running after NUMBER seconds.
SUFFIX may be `s' for seconds (the default), `m' for minutes,
`h' for hours or `d' for days.

Mandatory arguments to long options are mandatory for short options too.
  -s, --signal=SIGNAL
                   specify the signal to be sent on timeout.
                   SIGNAL may be a name like `HUP' or a number.
                   See `kill -l` for a list of signals
      --help display this help and exit
      --version output version information and exit

# timeout -k 1m 5m git remote update
timeout: invalid option -- 'k'
Try `timeout --help' for more information.

Do not know the exact version this change brought in, but timeout 8.13/8.20 works just fine.

Updated: Sorry for my misunderstanding, updated after Pádraig Brady's comment.