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NE555: Help generating 40kHz square wave

Part Number: NE555
Other Parts Discussed in Thread: TLC555

Hi there I'm attempting to generate a 40khz square wave using the 555 timer in astable mode to drive an ultrasonic transducer. The component values I have are as follows, R1 = 12k R2 = 12K C1 = 0.001u C2 = 10n and Vcc = 5V. When I test the output square wave on a breadboard I get a frequency of around 36kHz, so about a 4kHz swing. Thanks in advance