diff --git a/routes/_middleware.ts b/routes/_middleware.ts
index 86a88bb..ca79b40 100644
--- a/routes/_middleware.ts
+++ b/routes/_middleware.ts
@@ -1,7 +1,9 @@
 import { FreshContext } from '$fresh/server.ts'
-import { getCookies, setCookie } from '@std/http/cookie'
+import { deleteCookie, getCookies, setCookie } from '@std/http/cookie'
 import { SessionStore } from '../src/session/mod.ts'
 
+const instanceToken = crypto.randomUUID() // Instance uuid to reset perform cookie reset on server restart
+
 export async function handler(request: Request, ctx: FreshContext) {
 	// Allow service worker to serve root scope
 	const response = await ctx.next()
@@ -10,8 +12,24 @@ export async function handler(request: Request, ctx: FreshContext) {
 		response.headers.set('Service-Worker-Allowed', '/')
 	}
 
+	const cookies = getCookies(request.headers)
+
+	// Clear outdated cookies
+	if (cookies['_INSTANCE'] !== instanceToken) {
+		for (const cookie in cookies) {
+			deleteCookie(request.headers, cookie)
+		}
+		setCookie(response.headers, {
+			name: '_INSTANCE',
+			value: instanceToken,
+			httpOnly: true,
+			sameSite: 'Strict',
+			secure: true,
+		})
+	}
+
 	// Start session
-	if (getCookies(request.headers)['_SESSION'] === undefined) {
+	if (cookies['_SESSION'] === undefined) {
 		const session = SessionStore.createSession()
 
 		// Set session cookie