diff --git a/deno.jsonc b/deno.jsonc
index 5371e5e..a52bba9 100644
--- a/deno.jsonc
+++ b/deno.jsonc
@@ -11,11 +11,11 @@
     "main": "deno task run main.ts",
     "start": "deno task run --watch server.ts",
     // development
-    "test": "deno test --allow-env --allow-read --allow-net --allow-none",
+    "test": "deno test --allow-env --allow-read --allow-net --allow-none --unstable",
     "cov": "deno task test --coverage=cov_profile; deno coverage cov_profile",
     "lint": "deno lint --ignore=cov_profile",
     "fmt": "deno fmt --ignore=cov_profile",
-    "check": "deno check ./**/*.ts",
+    "check": "deno check --unstable ./**/*.ts",
     "ci": "deno task check && deno task lint && deno task fmt --check && deno task test",
     "deps": "deno run --allow-read --allow-write --allow-net --allow-run https://deno.land/x/udd@0.8.2/main.ts --test='deno task test' deno.jsonc ./**.*.ts",
     // git hooks
diff --git a/denops/futago/futago.ts b/denops/futago/futago.ts
index 51ceac2..84e44a4 100644
--- a/denops/futago/futago.ts
+++ b/denops/futago/futago.ts
@@ -1,7 +1,7 @@
 // =============================================================================
 // File        : futago.ts
 // Author      : yukimemi
-// Last Change : 2024/01/14 00:53:40.
+// Last Change : 2024/01/14 01:48:09.
 // =============================================================================
 
 import * as datetime from "https://deno.land/std@0.212.0/datetime/mod.ts";
@@ -65,7 +65,7 @@ export class Futago {
   public async getHistory(): Promise<InputContent[]> {
     const lastHistory = await this.#db.get([this.chatTitle]);
     if (lastHistory.value) {
-      return lastHistory.value;
+      return (lastHistory.value) as InputContent[];
     } else {
       return [];
     }