diff --git a/src/main/ipc/index.ts b/src/main/ipc/index.ts
index 9d99df1..6ad77c4 100644
--- a/src/main/ipc/index.ts
+++ b/src/main/ipc/index.ts
@@ -426,6 +426,16 @@ export function registerIpcHandlers(): void {
         return result
     })
     ipcMain.handle('projects:update', async (_event, project) => {
+        // Clean up old config file if host changed
+        const projects = projectService.getProjects()
+        const oldProject = projects.find(p => p.id === project.id)
+        if (oldProject && oldProject.host !== project.host) {
+            const oldConfigPath = path.join(configService.getBasePath(), 'generated_configs', 'projects', `${oldProject.host}.conf`)
+            if (fs.existsSync(oldConfigPath)) {
+                try { fs.unlinkSync(oldConfigPath) } catch (e) { console.error('Error deleting old config:', e) }
+            }
+        }
+
         const result = projectService.updateProject(project)
         // Trigger Nginx restart
         await restartNginx()