diff --git a/package.json b/package.json
index 0d115b3..5cdd734 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     "autoprefixer": "^10.4.20",
     "debug": "^4.3.6",
     "express": "^4.19.2",
-    "ioredis": "^4.28.5",
+    "ioredis": "^5.4.2",
     "next": "^15.1.3",
     "next-themes": "^0.4.4",
     "next-view-transitions": "^0.3.4",
@@ -57,7 +57,6 @@
   },
   "devDependencies": {
     "@types/debug": "^4.1.12",
-    "@types/ioredis": "^4.28.10",
     "@types/node": "^22.10.2",
     "@types/react": "^19.0.2",
     "@typescript-eslint/eslint-plugin": "^8.18.2",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2ab7890..e91e3b4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -18,8 +18,8 @@ dependencies:
     specifier: ^4.19.2
     version: 4.21.2
   ioredis:
-    specifier: ^4.28.5
-    version: 4.28.5
+    specifier: ^5.4.2
+    version: 5.4.2
   next:
     specifier: ^15.1.3
     version: 15.1.3(react-dom@19.0.0)(react@19.0.0)
@@ -73,9 +73,6 @@ devDependencies:
   '@types/debug':
     specifier: ^4.1.12
     version: 4.1.12
-  '@types/ioredis':
-    specifier: ^4.28.10
-    version: 4.28.10
   '@types/node':
     specifier: ^22.10.2
     version: 22.10.5
@@ -406,6 +403,10 @@ packages:
     dev: false
     optional: true
 
+  /@ioredis/commands@1.2.0:
+    resolution: {integrity: sha512-Sx1pU8EM64o2BrqNpEO1CNLtKQwyhuXuqyfH7oGKCk+1a33d2r5saW8zNwm3j6BTExtjrv2BxTgzzkMwts6vGg==}
+    dev: false
+
   /@isaacs/cliui@8.0.2:
     resolution: {integrity: sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==}
     engines: {node: '>=12'}
@@ -641,12 +642,6 @@ packages:
     resolution: {integrity: sha512-D0CFMMtydbJAegzOyHjtiKPLlvnm3iTZyZRSZoLq2mRhDdmLfIWOCYPfQJ4cu2erKghU++QvjcUjp/5h7hESpA==}
     dev: false
 
-  /@types/ioredis@4.28.10:
-    resolution: {integrity: sha512-69LyhUgrXdgcNDv7ogs1qXZomnfOEnSmrmMFqKgt1XMJxmoOSG/u3wYy13yACIfKuMJ8IhKgHafDO3sx19zVQQ==}
-    dependencies:
-      '@types/node': 22.10.5
-    dev: true
-
   /@types/json-schema@7.0.15:
     resolution: {integrity: sha512-5+fP8P8MFNC+AyZCDxrB2pkZFPGzqQWUzpSeuuVLvm8VMcorNYavBqoFcxK8bQz4Qsbn4oUEEem4wDLfcysGHA==}
     dev: true
@@ -1452,8 +1447,8 @@ packages:
       object-keys: 1.1.1
     dev: true
 
-  /denque@1.5.1:
-    resolution: {integrity: sha512-XwE+iZ4D6ZUB7mfYRMb5wByE8L74HCn30FBN7sWnXksWc1LO1bPDl67pBR9o/kC4z/xSNAwkMYcGgqDV3BE3Hw==}
+  /denque@2.1.0:
+    resolution: {integrity: sha512-HVQE3AAb/pxF8fQAoiqpvg9i3evqug3hoiwakOyZAwJm+6vZehbkYXZ0l4JxS+I3QxM97v5aaRNhj8v5oBhekw==}
     engines: {node: '>=0.10'}
     dev: false
 
@@ -2507,18 +2502,16 @@ packages:
       side-channel: 1.1.0
     dev: true
 
-  /ioredis@4.28.5:
-    resolution: {integrity: sha512-3GYo0GJtLqgNXj4YhrisLaNNvWSNwSS2wS4OELGfGxH8I69+XfNdnmV1AyN+ZqMh0i7eX+SWjrwFKDBDgfBC1A==}
-    engines: {node: '>=6'}
+  /ioredis@5.4.2:
+    resolution: {integrity: sha512-0SZXGNGZ+WzISQ67QDyZ2x0+wVxjjUndtD8oSeik/4ajifeiRufed8fCb8QW8VMyi4MXcS+UO1k/0NGhvq1PAg==}
+    engines: {node: '>=12.22.0'}
     dependencies:
+      '@ioredis/commands': 1.2.0
       cluster-key-slot: 1.1.2
       debug: 4.4.0(supports-color@5.5.0)
-      denque: 1.5.1
+      denque: 2.1.0
       lodash.defaults: 4.2.0
-      lodash.flatten: 4.4.0
       lodash.isarguments: 3.1.0
-      p-map: 2.1.0
-      redis-commands: 1.7.0
       redis-errors: 1.2.0
       redis-parser: 3.0.0
       standard-as-callback: 2.1.0
@@ -2988,10 +2981,6 @@ packages:
     resolution: {integrity: sha512-qjxPLHd3r5DnsdGacqOMU6pb/avJzdh9tFX2ymgoZE27BmjXrNy/y4LoaiTeAb+O3gL8AfpJGtqfX/ae2leYYQ==}
     dev: false
 
-  /lodash.flatten@4.4.0:
-    resolution: {integrity: sha512-C5N2Z3DgnnKr0LOpv/hKCgKdb7ZZwafIrsesve6lmzvZIRZRGaZ/l6Q8+2W7NaT+ZwO3fFlSCzCzrDCFdJfZ4g==}
-    dev: false
-
   /lodash.isarguments@3.1.0:
     resolution: {integrity: sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg==}
     dev: false
@@ -3385,11 +3374,6 @@ packages:
       p-limit: 3.1.0
     dev: true
 
-  /p-map@2.1.0:
-    resolution: {integrity: sha512-y3b8Kpd8OAN444hxfBbFfj1FY/RjtTd8tzYwhUqNYXx0fXx2iX4maP4Qr6qhIKbQXI02wTLAda4fYUbDagTUFw==}
-    engines: {node: '>=6'}
-    dev: false
-
   /package-json-from-dist@1.0.1:
     resolution: {integrity: sha512-UEZIS3/by4OC8vL3P2dTXRETpebLI2NiI5vIrjaD/5UtrkFX/tNbwjTSRAGC/+7CAo2pIcBaRgWmcBBHcsaCIw==}
     dev: false
@@ -3695,10 +3679,6 @@ packages:
       picomatch: 2.3.1
     dev: false
 
-  /redis-commands@1.7.0:
-    resolution: {integrity: sha512-nJWqw3bTFy21hX/CPKHth6sfhZbdiHP6bTawSgQBlKOVRG7EZkfHbbHwQJnrE4vsQf0CMNE+3gJ4Fmm16vdVlQ==}
-    dev: false
-
   /redis-errors@1.2.0:
     resolution: {integrity: sha512-1qny3OExCf0UvUV/5wpYKf2YwPcOqXzkwKKSmKHiE6ZMQs5heeE/c8eXK+PNllPvmjgAbfnsbpkGZWy8cBpn9w==}
     engines: {node: '>=4'}
diff --git a/src/channel.ts b/src/channel.ts
index 8d7568c..c22c352 100644
--- a/src/channel.ts
+++ b/src/channel.ts
@@ -209,7 +209,7 @@ export class MemoryChannelRepo implements ChannelRepo {
 }
 
 export class RedisChannelRepo implements ChannelRepo {
-  client: Redis.Redis
+  client: Redis
 
   constructor() {
     this.client = getRedisClient()
diff --git a/src/redisClient.ts b/src/redisClient.ts
index 6bf3aaa..6383758 100644
--- a/src/redisClient.ts
+++ b/src/redisClient.ts
@@ -2,11 +2,13 @@ import Redis from 'ioredis'
 
 export { Redis }
 
-let redisClient: Redis.Redis | null = null
+let redisClient: Redis | null = null
 
-export function getRedisClient(): Redis.Redis {
+export function getRedisClient(): Redis {
   if (!redisClient) {
-    redisClient = new Redis(process.env.REDIS_URL)
+    redisClient = process.env.REDIS_URL
+      ? new Redis(process.env.REDIS_URL)
+      : new Redis()
   }
   return redisClient
 }