How to make the ticks inward of the frame in WCSaxes?

Hi, I was trying to display a fits file using WCSAxes. In my earlier version of matplotlib and WCSAxes, the ticks were appearing inward of the image frame. But, when I updated my astropy and matplotlib, the ticks are appearing outward of the frame. I tried direction=‘in’ keyword, but it is not working with WCSAxes. My other images created through other software have inward ticks, so I want consistency in all the images. My input code is as follows:

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.colors import LogNorm 
from astropy.io import fits
from astropy.wcs import WCS
from astropy import units as u
from astropy.visualization.wcsaxes import SphericalCircle

hdu = fits.open('newimage.fits')[0]
imdata = hdu.data
hdr = hdu.header
imdata[0,:,:].shape
wcs = WCS(hdr,relax=False)
w=wcs.celestial
clf()
fig = plt.figure(1)
ax = fig.add_subplot(111, projection=w, aspect='equal')
ax.tick_params(axis='both', which='both', direction='in')

ax.imshow(imdata[0,:,:], cmap='gray_r', vmin=4, vmax=8, norm=LogNorm(), origin='lower',alpha=1.0,aspect=1)

[astrofrog]

@astrosumit @rlpitts - just FYI you will be able to use tick_params in Astropy v3.1 once released (very shortly)

[astrofrog]

Ok, great!

We should keep this open as we should add this to the docs and also make tick_params work correctly (currently it has no effect)