  We investigate the possible anisotropy of the universe using the most
up-to-date type Ia supernovae, i.e. the Pantheon+ compilation. We fit the full
Pantheon+ data with the dipole-modulated $\Lambda$CDM model, and find that it
is well consistent with a null dipole. We further divide the full sample into
several subsamples with different high-redshift cutoff $z_c$. It is shown that
the dipole appears at $2\sigma$ confidence level only if $z_c\leq 0.1$, and in
this redshift region the dipole is very stable, almost independent of the
specific value of $z_c$. For $z_c=0.1$, the dipole amplitude is
$D=1.0_{-0.4}^{+0.4}\times 10^{-3}$, pointing towards $(l,b)=(334.5_{\
-21.6^{\circ}}^{\circ +25.7^{\circ}},16.0_{\ -16.8^{\circ}}^{\circ
+27.1^{\circ}})$, which is about $65^{\circ}$ away from the CMB dipole. This
implies that the full Pantheon+ is consistent with a large-scale isotropic
universe, but the low-redshift anisotropy couldn't be purely explained by the
peculiar motion of the local universe.
