The electroweak couplings of up- and down-type quarks have been measured 
using the entire OPAL $\rm Z^0$ hadronic decay sample. 
$\rm Z\rightarrow q\bar{q}\gamma$ decays were selected by tagging 
multihadronic final states with an isolated photon candidates
in the electromagnetic calorimeter. By this selection a subsample was 
extracted which is enriched in up-type quarks. Combining the measured 
rates of $\rm Z\rightarrow q\bar{q}\gamma$ decays with the total rate 
of hadronic $\rm Z^0$~decays permits the simultaneous determination of the 
electroweak couplings of up- and down-type quarks.
The obtained values for the couplings are in good agreement with the 
Standard Model.