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src/components/AppShell.jsx

@@ -171,10 +171,12 @@ class AppSidebar extends PureComponent {
                 </ListItemIcon>
                 <ListItemText
                   primary={label}
-                  primaryTypographyProps={{
-                    fontSize: { xs: '0.8rem', sm: '0.875rem' },
-                    fontWeight: active ? 600 : 500,
-                    noWrap: true,
+                  slotProps={{
+                    primary: {
+                      fontSize: { xs: '0.8rem', sm: '0.875rem' },
+                      fontWeight: active ? 600 : 500,
+                      noWrap: true,
+                    },
                   }}
                   sx={{
                     m: { xs: 0, lg: 'initial' },

src/components/UserMenu.jsx

@@ -167,7 +167,9 @@ class UserMenu extends PureComponent {
               <ListItemText
                 primary="Update verfügbar"
                 secondary="Jetzt aktualisieren"
-                primaryTypographyProps={{ fontWeight: 600, color: 'primary.main' }}
+                slotProps={{
+                  primary: { fontWeight: 600, color: 'primary.main' },
+                }}
               />
             </MenuItem>
           )}