diff --git a/code/backend/src/server.ts b/code/backend/src/server.ts
index 072e847..771421c 100644
--- a/code/backend/src/server.ts
+++ b/code/backend/src/server.ts
@@ -31,6 +31,7 @@ export const minioClient = new Client({
 //swagger configuration
 import swaggerJSDoc from "swagger-jsdoc";
 import swaggerUi from "swagger-ui-express";
+import { deleteExpiredTokens } from "./tasks/deleteTokens";
 
 const options = {
   definition: {
@@ -65,6 +66,15 @@ const options = {
 };
 const specs = swaggerJSDoc(options);
 app.use("/api-docs", swaggerUi.serve, swaggerUi.setup(specs));
+
+// remove old tokens every ten minutes
+setInterval(
+  () => {
+    console.log("Deleting old tokens");
+    deleteExpiredTokens();
+  },
+  10 * 60 * 1000
+);
 app.use(bodyParser.json());
 app.use("/api/user", userRouter);
 app.use("/api/posts", authenticateToken(), postRouter);
diff --git a/code/backend/src/tasks/deleteTokens.ts b/code/backend/src/tasks/deleteTokens.ts
new file mode 100644
index 0000000..9f076bc
--- /dev/null
+++ b/code/backend/src/tasks/deleteTokens.ts
@@ -0,0 +1,19 @@
+import { PrismaClient } from "../../prisma/app/generated/prisma/client";
+
+const prisma = new PrismaClient();
+
+export const deleteExpiredTokens = async () => {
+  const now = new Date();
+  try {
+    const result = await prisma.refreshToken.deleteMany({
+      where: {
+        expiresAt: {
+          lt: now, // delete expired tokens
+        },
+      },
+    });
+    console.log(`deleted ${result.count} tokens`);
+  } catch (error) {
+    console.error("Error while deleting tokens:", error);
+  }
+};