  The ATLAS and CMS collaborations have recently released significant new data
on Higgs and diboson production in LHC Run 2. Measurements of Higgs properties
have improved in many channels, while kinematic information for $h \to
\gamma\gamma$ and $h \to ZZ$ can now be more accurately incorporated in fits
using the STXS method, and $W^+ W^-$ diboson production at high $p_T$ gives new
sensitivity to deviations from the Standard Model. We have performed an updated
global fit to precision electroweak data, $W^+W^-$ measurements at LEP, and
Higgs and diboson data from Runs 1 and 2 of the LHC in the framework of the
Standard Model Effective Field Theory (SMEFT), allowing all coefficients to
vary across the combined dataset, and present the results in both the Warsaw
and SILH operator bases. We exhibit the improvement in the constraints on
operator coefficients provided by the LHC Run 2 data, and discuss the
correlations between them. We also explore the constraints our fit results
impose on several models of physics beyond the Standard Model, including models
that contribute to the operator coefficients at the tree level and stops in the
MSSM that contribute via loops.
