diff --git a/app-emulation/wine-staging/wine-staging-9999.ebuild b/app-emulation/wine-staging/wine-staging-9999.ebuild
index 9923f39fc484..e2746ef1b3b0 100644
--- a/app-emulation/wine-staging/wine-staging-9999.ebuild
+++ b/app-emulation/wine-staging/wine-staging-9999.ebuild
@@ -7,7 +7,7 @@ PYTHON_COMPAT=( python3_{11..14} )
 inherit edo optfeature python-any-r1 wine
 
 WINE_GECKO=2.47.4
-WINE_MONO=10.3.0
+WINE_MONO=10.4.0
 WINE_P=wine-$(ver_cut 1-2)
 
 if [[ ${PV} == 9999 ]]; then