diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cc24903..10dae18 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,3 +26,4 @@ jobs:
           JWT_SECRET: "ci-placeholder-jwt-secret-min-32-chars"
           DATABASE_URL: "postgresql://placeholder:placeholder@localhost:5432/placeholder"
           DIRECT_URL: "postgresql://placeholder:placeholder@localhost:5432/placeholder"
+          ADMIN_PASSWORD: "ci-placeholder-admin-password"
diff --git a/.jules/sentinel.md b/.jules/sentinel.md
new file mode 100644
index 0000000..f722a22
--- /dev/null
+++ b/.jules/sentinel.md
@@ -0,0 +1,4 @@
+## 2024-05-24 - Hardcoded Admin Password
+**Vulnerability:** Found a hardcoded `ADMIN_PASSWORD` secret in `packages/web/src/lib/server/admin-auth.ts`.
+**Learning:** Hardcoding credentials makes them accessible in source control and compiled assets, leading to severe exposure.
+**Prevention:** Store secrets as environment variables, validate their presence at startup using tools like Zod, and inject them via CI/CD pipelines instead of embedding them directly in source code.
diff --git a/packages/web/.env.example b/packages/web/.env.example
index e99d51e..73368e6 100644
--- a/packages/web/.env.example
+++ b/packages/web/.env.example
@@ -4,3 +4,4 @@ AUTH_SECRET=replace-with-min-32-char-random-string
 DATABASE_URL="postgresql://postgres.[project]:[password]@aws-0-ap-northeast-1.pooler.supabase.com:6543/postgres?pgbouncer=true"
 DIRECT_URL="postgresql://postgres.[project]:[password]@db.uwxfseowdzuuepeeudrx.supabase.co:5432/postgres"
 JWT_SECRET="replace-with-32-char-minimum-random-string"
+ADMIN_PASSWORD=replace-with-secure-admin-password
diff --git a/packages/web/src/app/api/admin/login/route.ts b/packages/web/src/app/api/admin/login/route.ts
index dbf5d2e..24fabdb 100644
--- a/packages/web/src/app/api/admin/login/route.ts
+++ b/packages/web/src/app/api/admin/login/route.ts
@@ -20,7 +20,7 @@ const AdminLoginSchema = z.object({
 export async function POST(req: Request) {
   try {
     const input = AdminLoginSchema.parse(await req.json())
-    if (!verifyAdminCredentials(input)) {
+    if (!(await verifyAdminCredentials(input))) {
       return NextResponse.json({ error: 'Invalid username or password' }, { status: 401 })
     }
 
diff --git a/packages/web/src/lib/server/admin-auth.ts b/packages/web/src/lib/server/admin-auth.ts
index 5390fa4..3c9a14f 100644
--- a/packages/web/src/lib/server/admin-auth.ts
+++ b/packages/web/src/lib/server/admin-auth.ts
@@ -1,19 +1,33 @@
 import 'server-only'
 
-import { createHmac, randomBytes, timingSafeEqual } from 'crypto'
+import { createHmac, pbkdf2Sync, pbkdf2, randomBytes, timingSafeEqual } from 'crypto'
 import { cookies } from 'next/headers'
 import { NextRequest, NextResponse } from 'next/server'
+import { promisify } from 'util'
 
 import { env } from './env'
 
 export const ADMIN_USERNAME = 'admin'
-export const ADMIN_PASSWORD = 'og9oRajx7h88v1RIj3eDgdrh9jgLYVV3'
+export const ADMIN_PASSWORD = env.ADMIN_PASSWORD
 
 const ADMIN_SESSION_COOKIE = 'argos_admin_session'
 const ADMIN_SESSION_TTL_MS = 12 * 60 * 60 * 1000
 const ADMIN_IMPERSONATION_TTL_MS = 60 * 1000
 const ADMIN_IMPERSONATION_PREFIX = 'argos_imp'
 
+// Pre-compute the admin password hash at startup to avoid slow, synchronous operations
+// later and to satisfy CodeQL's secure password hashing rule.
+const ADMIN_PASSWORD_SALT = env.JWT_SECRET.substring(0, 16)
+const EXPECTED_ADMIN_PASSWORD_HASH = pbkdf2Sync(
+  env.ADMIN_PASSWORD,
+  ADMIN_PASSWORD_SALT,
+  100000,
+  64,
+  'sha512'
+)
+
+const pbkdf2Async = promisify(pbkdf2)
+
 function safeEqual(a: string, b: string): boolean {
   const aHash = createHmac('sha256', env.JWT_SECRET).update(a).digest()
   const bHash = createHmac('sha256', env.JWT_SECRET).update(b).digest()
@@ -24,14 +38,21 @@ function sign(payload: string): string {
   return createHmac('sha256', env.JWT_SECRET).update(payload).digest('base64url')
 }
 
-export function verifyAdminCredentials(input: {
+export async function verifyAdminCredentials(input: {
   username: string
   password: string
-}): boolean {
-  return (
-    safeEqual(input.username, ADMIN_USERNAME) &&
-    safeEqual(input.password, ADMIN_PASSWORD)
+}): Promise<boolean> {
+  if (!safeEqual(input.username, ADMIN_USERNAME)) return false
+
+  const inputHash = await pbkdf2Async(
+    input.password,
+    ADMIN_PASSWORD_SALT,
+    100000,
+    64,
+    'sha512'
   )
+
+  return timingSafeEqual(inputHash, EXPECTED_ADMIN_PASSWORD_HASH)
 }
 
 export function createAdminSessionCookieValue(): string {
diff --git a/packages/web/src/lib/server/env.ts b/packages/web/src/lib/server/env.ts
index 86ed9a3..8e6fc2f 100644
--- a/packages/web/src/lib/server/env.ts
+++ b/packages/web/src/lib/server/env.ts
@@ -5,6 +5,7 @@ const EnvSchema = z.object({
   DATABASE_URL: z.string().min(1),
   DIRECT_URL: z.string().min(1),
   JWT_SECRET: z.string().min(32),
+  ADMIN_PASSWORD: z.string().min(8),
 })
 
 export const env = EnvSchema.parse(process.env)