  The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio
$R={\Gamma}({\pi}^+{\rightarrow}e^+{\nu}_e({\gamma}))/{\Gamma}({\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}({\gamma}))$
with precision $<0.1$% to provide a sensitive test of electron-muon
universality in weak interactions. The current status of the PIENU experiment
is presented.
