diff --git a/app-emulation/wine-vanilla/wine-vanilla-9999.ebuild b/app-emulation/wine-vanilla/wine-vanilla-9999.ebuild
index 5f47277943826..51b66905e8f9f 100644
--- a/app-emulation/wine-vanilla/wine-vanilla-9999.ebuild
+++ b/app-emulation/wine-vanilla/wine-vanilla-9999.ebuild
@@ -6,7 +6,7 @@ EAPI=8
 inherit optfeature wine
 
 WINE_GECKO=2.47.4
-WINE_MONO=10.3.0
+WINE_MONO=10.4.0
 
 if [[ ${PV} == 9999 ]]; then
 	inherit git-r3