diff --git a/app/[docs_id]/markdown.tsx b/app/[docs_id]/markdown.tsx
index 8c6c252..80d99f3 100644
--- a/app/[docs_id]/markdown.tsx
+++ b/app/[docs_id]/markdown.tsx
@@ -3,7 +3,7 @@ import remarkGfm from "remark-gfm";
 import SyntaxHighlighter from "react-syntax-highlighter";
 import { PythonEmbeddedTerminal } from "../terminal/python/embedded";
 import { Heading } from "./section";
-import { AceLang, EditorComponent } from "../terminal/editor";
+import { type AceLang, EditorComponent } from "../terminal/editor";
 import { ExecFile, ExecLang } from "../terminal/exec";
 import { tomorrow } from "react-syntax-highlighter/dist/esm/styles/hljs";
 
diff --git a/app/[docs_id]/page.tsx b/app/[docs_id]/page.tsx
index f70c950..44b182d 100644
--- a/app/[docs_id]/page.tsx
+++ b/app/[docs_id]/page.tsx
@@ -4,7 +4,7 @@ import { readFile } from "node:fs/promises";
 import { join } from "node:path";
 import { MarkdownSection, splitMarkdown } from "./splitMarkdown";
 import { Section } from "./section";
-import * as pyodideLock from "pyodide/pyodide-lock.json";
+import pyodideLock from "pyodide/pyodide-lock.json";
 
 export default async function Page({
   params,
@@ -22,9 +22,14 @@ export default async function Page({
       );
     } else {
       const cfAssets = getCloudflareContext().env.ASSETS;
-      mdContent = await cfAssets!
-        .fetch(`https://assets.local/docs/${docs_id}.md`)
-        .then((res) => res.text());
+      const mdRes = await cfAssets!.fetch(
+        `https://assets.local/docs/${docs_id}.md`
+      );
+      if (mdRes.ok) {
+        mdContent = await mdRes.text();
+      } else {
+        notFound();
+      }
     }
   } catch (error) {
     console.error(error);
diff --git a/app/terminal/editor.tsx b/app/terminal/editor.tsx
index 92e6e98..e6e68a8 100644
--- a/app/terminal/editor.tsx
+++ b/app/terminal/editor.tsx
@@ -1,18 +1,23 @@
 "use client";
 
-import { useFile } from "./file";
-import AceEditor from "react-ace";
+import dynamic from "next/dynamic";
+// https://github.com/securingsincity/react-ace/issues/27 により普通のimportができない
+const AceEditor = dynamic(async () => {
+  const ace = await import("react-ace");
+  // テーマは色分けが今のTerminal側のハイライト(highlight.js)の実装に近いものを適当に選んだ
+  await import("ace-builds/src-min-noconflict/theme-tomorrow");
+  await import("ace-builds/src-min-noconflict/theme-twilight");
+  await import("ace-builds/src-min-noconflict/ext-language_tools");
+  await import("ace-builds/src-min-noconflict/ext-searchbox");
+  await import("ace-builds/src-min-noconflict/mode-python");
+  await import("ace-builds/src-min-noconflict/mode-c_cpp");
+  await import("ace-builds/src-min-noconflict/mode-json");
+  await import("ace-builds/src-min-noconflict/mode-csv");
+  await import("ace-builds/src-min-noconflict/mode-text");
+  return ace;
+}, { ssr: false });
 import "./editor.css";
-// テーマは色分けが今のTerminal側のハイライト(highlight.js)の実装に近いものを適当に選んだ
-import "ace-builds/src-min-noconflict/theme-tomorrow";
-import "ace-builds/src-min-noconflict/theme-twilight";
-import "ace-builds/src-min-noconflict/ext-language_tools";
-import "ace-builds/src-min-noconflict/ext-searchbox";
-import "ace-builds/src-min-noconflict/mode-python";
-import "ace-builds/src-min-noconflict/mode-c_cpp";
-import "ace-builds/src-min-noconflict/mode-json";
-import "ace-builds/src-min-noconflict/mode-csv";
-import "ace-builds/src-min-noconflict/mode-text";
+import { useFile } from "./file";
 import { useEffect } from "react";
 import { useSectionCode } from "../[docs_id]/section";
 import clsx from "clsx";
@@ -38,13 +43,7 @@ export function EditorComponent(props: EditorProps) {
       writeFile(props.filename, props.initContent);
     }
     addSectionFile?.(props.filename);
-  }, [
-    files,
-    props.filename,
-    props.initContent,
-    writeFile,
-    addSectionFile,
-  ]);
+  }, [files, props.filename, props.initContent, writeFile, addSectionFile]);
 
   return (
     <div className="embedded-editor">
diff --git a/declatations.d.ts b/declatations.d.ts
new file mode 100644
index 0000000..7bd2f6a
--- /dev/null
+++ b/declatations.d.ts
@@ -0,0 +1 @@
+declare module "ace-builds/src-min-noconflict/*";