Need a Higher Spectrum Frequency

Audacity is helpful, but I have run into an issue… I am trying to record a sound beyond 20 to 21 kHz, and I was wondering if anyone can either help me find a freeware spectrogram that can show frequencies in my audio beyond 21kHz, or if it is possible Audacity could come out with an update for a higher ranged Plot Spectrum?

The 22050KHz limit is due to using the standard sampling rate of 44100Hz.
If you use a higher sample rate, (e.g. 96000Hz), the upper limit of the spectrum will increase, (to 48000Hz)…
sample rate of 96KHz includes frequencies up to 48KHz.gif
You do know 21KHz is ultrasound and is inaudible to humans.

Oh ok… thank you.