  We update the indirect constraints on the Georgi-Machacek model from
$B$-physics and electroweak precision observables, including new constraints
from $b \to s \gamma$ and $B^0_s \to \mu^+ \mu^-$. We illustrate the effect of
these constraints on the couplings of the Standard Model-like Higgs boson by
performing scans using the most general scalar potential, subject to vacuum
stability and perturbativity constraints. We find that simultaneous
enhancements of all the Higgs production cross sections by up to 39\% are still
allowed after imposing these constraints. LHC rate measurements on the Higgs
pole could be blind to these enhancements if unobserved non-standard Higgs
decays are present.
