diff --git a/components/CustomEmbedLinkMenu.tsx b/components/CustomEmbedLinkMenu.tsx
index 94ce7ad..862ae68 100644
--- a/components/CustomEmbedLinkMenu.tsx
+++ b/components/CustomEmbedLinkMenu.tsx
@@ -81,15 +81,17 @@ export default function CustomEmbedLinkMenu({
                 {t('Customise direct link')}
               </Dialog.Title>
               <Dialog.Description as="p" className="py-2 opacity-80">
-                {t('Change the raw file direct link to a URL ending with the extension of the file.')}{' '}
-                <a
-                  href="https://ovi.swo.moe/docs/features/customise-direct-link"
-                  target="_blank"
-                  rel="noopener noreferrer"
-                  className="text-blue-400 underline"
-                >
-                  {t('What is this?')}
-                </a>
+                <>
+                  {t('Change the raw file direct link to a URL ending with the extension of the file.')}{' '}
+                  <a
+                    href="https://ovi.swo.moe/docs/features/customise-direct-link"
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="text-blue-400 underline"
+                  >
+                    {t('What is this?')}
+                  </a>
+                </>
               </Dialog.Description>
 
               <div className="mt-4">
diff --git a/components/previews/MarkdownPreview.tsx b/components/previews/MarkdownPreview.tsx
index f228fca..bcfe8df 100644
--- a/components/previews/MarkdownPreview.tsx
+++ b/components/previews/MarkdownPreview.tsx
@@ -1,6 +1,6 @@
 import { FC, CSSProperties, ReactNode } from 'react'
 import ReactMarkdown from 'react-markdown'
-import gfm from 'remark-gfm'
+import remarkGfm from 'remark-gfm'
 import remarkMath from 'remark-math'
 import rehypeKatex from 'rehype-katex'
 import rehypeRaw from 'rehype-raw'
@@ -120,7 +120,8 @@ const MarkdownPreview: FC<{
         <div className="markdown-body">
           {/* Using rehypeRaw to render HTML inside Markdown is potentially dangerous, use under safe environments. (#18) */}
           <ReactMarkdown
-            remarkPlugins={[gfm, remarkMath]}
+            // @ts-ignore
+            remarkPlugins={[remarkGfm, remarkMath]}
             // The type error is introduced by caniuse-lite upgrade.
             // Since type errors occur often in remark toolchain and the use is so common,
             // ignoring it shoudld be safe enough.
diff --git a/package.json b/package.json
index 73a1c04..288af2b 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
   "devDependencies": {
     "@types/cors": "^2.8.12",
     "@types/crypto-js": "^4.0.2",
-    "@types/ioredis": "^4.28.5",
+    "@types/node": "18.8.3",
     "@types/react": "18.0.21",
     "@types/react-copy-to-clipboard": "^5.0.4",
     "@types/react-dom": "^18.0.6",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e3cc8b8..1bea398 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,7 +10,7 @@ specifiers:
   '@tailwindcss/line-clamp': ^0.4.2
   '@types/cors': ^2.8.12
   '@types/crypto-js': ^4.0.2
-  '@types/ioredis': ^4.28.5
+  '@types/node': 18.8.3
   '@types/react': 18.0.21
   '@types/react-copy-to-clipboard': ^5.0.4
   '@types/react-dom': ^18.0.6
@@ -107,7 +107,7 @@ dependencies:
 devDependencies:
   '@types/cors': 2.8.12
   '@types/crypto-js': 4.1.1
-  '@types/ioredis': 4.28.10
+  '@types/node': 18.8.3
   '@types/react': 18.0.21
   '@types/react-copy-to-clipboard': 5.0.4
   '@types/react-dom': 18.0.6
@@ -439,12 +439,6 @@ packages:
       hoist-non-react-statics: 3.3.2
     dev: false
 
-  /@types/ioredis/4.28.10:
-    resolution: {integrity: sha512-69LyhUgrXdgcNDv7ogs1qXZomnfOEnSmrmMFqKgt1XMJxmoOSG/u3wYy13yACIfKuMJ8IhKgHafDO3sx19zVQQ==}
-    dependencies:
-      '@types/node': 18.0.6
-    dev: true
-
   /@types/json5/0.0.29:
     resolution: {integrity: sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==}
     dev: true
@@ -474,8 +468,8 @@ packages:
     resolution: {integrity: sha512-iiUgKzV9AuaEkZqkOLDIvlQiL6ltuZd9tGcW3gwpnX8JbuiuhFlEGmmFXEXkN50Cvq7Os88IY2v0dkDqXYWVgA==}
     dev: false
 
-  /@types/node/18.0.6:
-    resolution: {integrity: sha512-/xUq6H2aQm261exT6iZTMifUySEt4GR5KX8eYyY+C4MSNPqSh9oNIP7tz2GLKTlFaiBbgZNxffoR3CVRG+cljw==}
+  /@types/node/18.8.3:
+    resolution: {integrity: sha512-0os9vz6BpGwxGe9LOhgP/ncvYN5Tx1fNcd2TM3rD/aCGBkysb+ZWpXEocG24h6ZzOi13+VB8HndAQFezsSOw1w==}
     dev: true
 
   /@types/parse5/6.0.3:
diff --git a/utils/odAuthTokenStore.ts b/utils/odAuthTokenStore.ts
index c359358..3955b63 100644
--- a/utils/odAuthTokenStore.ts
+++ b/utils/odAuthTokenStore.ts
@@ -3,7 +3,7 @@ import siteConfig from '../config/site.config'
 
 // Persistent key-value store is provided by Redis, hosted on Upstash
 // https://vercel.com/integrations/upstash
-const kv = new Redis(process.env.REDIS_URL)
+const kv = new Redis(process.env.REDIS_URL || '')
 
 export async function getOdAuthTokens(): Promise<{ accessToken: unknown; refreshToken: unknown }> {
   const accessToken = await kv.get(`${siteConfig.kvPrefix}access_token`)
@@ -24,6 +24,6 @@ export async function storeOdAuthTokens({
   accessTokenExpiry: number
   refreshToken: string
 }): Promise<void> {
-  await kv.set(`${siteConfig.kvPrefix}access_token`, accessToken, 'ex', accessTokenExpiry)
+  await kv.set(`${siteConfig.kvPrefix}access_token`, accessToken, 'EX', accessTokenExpiry)
   await kv.set(`${siteConfig.kvPrefix}refresh_token`, refreshToken)
 }