diff --git a/.gitignore b/.gitignore
index bbb508f..04210a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /.env
 *.gz
+_fresh/
diff --git a/main.ts b/main.ts
index 74d4f37..2a7af93 100644
--- a/main.ts
+++ b/main.ts
@@ -6,10 +6,14 @@
 
 import { start } from "$fresh/server.ts";
 import manifest from "~/fresh.gen.ts";
+import { initPool } from "~/server/db.ts";
+import { env } from "~/server/env.ts";
 
 // const render: RenderFunction = (ctx, render) => {
 //   ctx.lang = "ja";
 //   render();
 // };
 
+env.init();
+initPool();
 await start(manifest);
diff --git a/routes/callback.tsx b/routes/callback.tsx
index 36b5b37..479acf5 100644
--- a/routes/callback.tsx
+++ b/routes/callback.tsx
@@ -1,5 +1,5 @@
 import { Handlers } from "$fresh/server.ts";
-import { clientId, clientSecret } from "~/server/env.ts";
+import { env } from "~/server/env.ts";
 import { createSession, getCallbackUrl } from "~/server/auth.ts";
 import { selectUserByGoogleId, transaction, updateUser, upsertUser } from "~/server/db.ts";
 
@@ -29,8 +29,8 @@ export const handler: Handlers = {
           method: "POST",
           headers: { "Content-Type": "application/x-www-form-urlencoded" },
           body: new URLSearchParams([
-            ["client_id", clientId],
-            ["client_secret", clientSecret],
+            ["client_id", env.clientId],
+            ["client_secret", env.clientSecret],
             ["redirect_uri", redirectUri],
             ["grant_type", "authorization_code"],
             ["code", code],
diff --git a/server/auth.ts b/server/auth.ts
index c18854f..f1818cb 100644
--- a/server/auth.ts
+++ b/server/auth.ts
@@ -1,6 +1,6 @@
 import { getCookies, setCookie } from "$std/http/cookie.ts";
 import { AppUser, insertSession, pool, selectSession } from "~/server/db.ts";
-import { clientId } from "~/server/env.ts";
+import { env } from "~/server/env.ts";
 
 export type SessionType = { id: string; user: AppUser };
 
@@ -39,12 +39,12 @@ export function getCallbackUrl(requestUrl: string) {
 
 export function getAuthUrl(requestUrl: string): string {
   const redirectUri = getCallbackUrl(requestUrl);
-  if (!clientId) {
+  if (!env.clientId) {
     throw new Error("clientId is undefined");
   }
   return "https://accounts.google.com/o/oauth2/auth?" +
     new URLSearchParams([
-      ["client_id", clientId],
+      ["client_id", env.clientId],
       ["redirect_uri", redirectUri],
       ["scope", "https://www.googleapis.com/auth/userinfo.profile"],
       ["access_type", "offline"],
diff --git a/server/db.ts b/server/db.ts
index ad83046..7ad6b47 100644
--- a/server/db.ts
+++ b/server/db.ts
@@ -50,20 +50,25 @@ export type AppNotification = {
   name?: string; // app_user
 };
 
-const connectionPool = new Pool(
-  {
-    tls: {
-      enforce: false,
-      caCertificates: [
-        `-----BEGIN CERTIFICATE-----\n${
-          Deno.env.get("MDSNS_DATABASE_CA_CERTIFICATE")
-        }\n-----END CERTIFICATE-----`,
-      ],
+let connectionPool: Pool;
+
+export function initPool() {
+  // build 時に処理が動かないように初期化を遅延させる
+  connectionPool = new Pool(
+    {
+      tls: {
+        enforce: false,
+        caCertificates: [
+          `-----BEGIN CERTIFICATE-----\n${
+            Deno.env.get("MDSNS_DATABASE_CA_CERTIFICATE")
+          }\n-----END CERTIFICATE-----`,
+        ],
+      },
     },
-  },
-  5,
-  true,
-);
+    5,
+    true,
+  );
+}
 
 export async function pool<T>(
   handler: (client: PoolClient) => Promise<T>,
diff --git a/server/env.ts b/server/env.ts
index 6508a37..5021ca5 100644
--- a/server/env.ts
+++ b/server/env.ts
@@ -1,4 +1,4 @@
-export function get(name: string) {
+function get(name: string) {
   const value = Deno.env.get(name);
   if (!value) {
     console.error("Cannot get the environment variable: " + name);
@@ -7,5 +7,20 @@ export function get(name: string) {
   return value;
 }
 
-export const clientId = get("LEAVES_AUTH_CLIENT_ID");
-export const clientSecret = get("LEAVES_AUTH_CLIENT_SECRET");
+class Env {
+  #clientId?: string;
+  #clientSecret?: string;
+  init() {
+    // build 時に処理が動かないように初期化を遅延させる
+    this.#clientId = get("LEAVES_AUTH_CLIENT_ID");
+    this.#clientSecret = get("LEAVES_AUTH_CLIENT_SECRET");
+  }
+  get clientId() {
+    return this.#clientId ?? "";
+  }
+  get clientSecret() {
+    return this.#clientSecret ?? "";
+  }
+}
+
+export const env = new Env();