diff --git a/.changeset/few-wombats-design.md b/.changeset/few-wombats-design.md
new file mode 100644
index 000000000..fc5d13365
--- /dev/null
+++ b/.changeset/few-wombats-design.md
@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": patch
+---
+
+add(dev-overrides): In memory tagCache with nextMode
\ No newline at end of file
diff --git a/examples/app-router/open-next.config.local.ts b/examples/app-router/open-next.config.local.ts
index b651dde59..63d80481e 100644
--- a/examples/app-router/open-next.config.local.ts
+++ b/examples/app-router/open-next.config.local.ts
@@ -7,7 +7,7 @@ export default {
       converter: "node",
       incrementalCache: "fs-dev",
       queue: "direct",
-      tagCache: "dummy",
+      tagCache: "fs-dev-nextMode",
     },
   },
 
diff --git a/packages/open-next/src/overrides/tagCache/fs-dev-nextMode.ts b/packages/open-next/src/overrides/tagCache/fs-dev-nextMode.ts
new file mode 100644
index 000000000..20dc7bd42
--- /dev/null
+++ b/packages/open-next/src/overrides/tagCache/fs-dev-nextMode.ts
@@ -0,0 +1,55 @@
+import type { NextModeTagCache } from "types/overrides";
+import { debug } from "../../adapters/logger";
+
+const tagsMap = new Map<string, number>();
+
+export default {
+  name: "fs-dev-nextMode",
+  mode: "nextMode",
+  getLastRevalidated: async (tags: string[]) => {
+    if (globalThis.openNextConfig.dangerous?.disableTagCache) {
+      return 0;
+    }
+
+    let lastRevalidated = 0;
+
+    tags.forEach((tag) => {
+      const tagTime = tagsMap.get(tag);
+      if (tagTime && tagTime > lastRevalidated) {
+        lastRevalidated = tagTime;
+      }
+    });
+
+    debug("getLastRevalidated result:", lastRevalidated);
+    return lastRevalidated;
+  },
+  hasBeenRevalidated: async (tags: string[], lastModified?: number) => {
+    if (globalThis.openNextConfig.dangerous?.disableTagCache) {
+      return false;
+    }
+
+    const hasRevalidatedTag = tags.some((tag) => {
+      const tagRevalidatedAt = tagsMap.get(tag);
+      return tagRevalidatedAt ? tagRevalidatedAt > (lastModified ?? 0) : false;
+    });
+
+    debug("hasBeenRevalidated result:", hasRevalidatedTag);
+    return hasRevalidatedTag;
+  },
+  writeTags: async (tags: string[]) => {
+    if (
+      globalThis.openNextConfig.dangerous?.disableTagCache ||
+      tags.length === 0
+    ) {
+      return;
+    }
+
+    debug("writeTags", { tags: tags });
+
+    tags.forEach((tag) => {
+      tagsMap.set(tag, Date.now());
+    });
+
+    debug("writeTags completed, written", tags.length, "tags");
+  },
+} satisfies NextModeTagCache;
diff --git a/packages/open-next/src/types/open-next.ts b/packages/open-next/src/types/open-next.ts
index d619dfadf..53023d5ae 100644
--- a/packages/open-next/src/types/open-next.ts
+++ b/packages/open-next/src/types/open-next.ts
@@ -175,6 +175,7 @@ export type IncludedTagCache =
   | "dynamodb-lite"
   | "dynamodb-nextMode"
   | "fs-dev"
+  | "fs-dev-nextMode"
   | "dummy";
 
 export type IncludedImageLoader =