diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index 59441826b0..0d9c3a96f5 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -210,7 +210,7 @@
 		errorsElement.appendChild(detailsElement);
 		addStyle(`
 		* {
-			font-family: BIZ UDGothic, Roboto, HelveticaNeue, Arial, sans-serif;
+			font-family: Segoe UI, HelveticaNeue, BIZ UDGothic, Roboto, Arial, sans-serif;
 		}
 
 		#misskey_app,
diff --git a/packages/backend/src/server/web/error.css b/packages/backend/src/server/web/error.css
index f2b63296eb..20527004c4 100644
--- a/packages/backend/src/server/web/error.css
+++ b/packages/backend/src/server/web/error.css
@@ -5,7 +5,7 @@
  */
 
 * {
-    font-family: BIZ UDGothic, Roboto, HelveticaNeue, Arial, sans-serif;
+    font-family: Segoe UI, HelveticaNeue, BIZ UDGothic, Roboto, Arial, sans-serif;
 }
 
 #misskey_app,
diff --git a/packages/frontend/.storybook/preview-head.html b/packages/frontend/.storybook/preview-head.html
index 30f3ebfb64..34f5ee09ec 100644
--- a/packages/frontend/.storybook/preview-head.html
+++ b/packages/frontend/.storybook/preview-head.html
@@ -4,7 +4,7 @@
 <link rel="stylesheet" href="https://unpkg.com/@fontsource/m-plus-rounded-1c/index.css">
 <style>
 	html {
-		font-family: 'Hiragino Maru Gothic Pro', 'BIZ UDGothic', Roboto, HelveticaNeue, Arial, 'M PLUS Rounded 1c', sans-serif;
+		font-family: 'Segoe UI', HelveticaNeue, 'Hiragino Maru Gothic Pro', 'BIZ UDGothic', Roboto, Arial, 'M PLUS Rounded 1c', sans-serif;
 	}
 </style>
 <script>
diff --git a/packages/frontend/src/style.scss b/packages/frontend/src/style.scss
index cbec377277..9d4038675d 100644
--- a/packages/frontend/src/style.scss
+++ b/packages/frontend/src/style.scss
@@ -35,7 +35,7 @@ html {
 	accent-color: var(--accent);
 	overflow: auto;
 	overflow-wrap: break-word;
-	font-family: 'Hiragino Maru Gothic Pro', "BIZ UDGothic", Roboto, HelveticaNeue, Arial, sans-serif;
+	font-family: 'Segoe UI', HelveticaNeue, 'Hiragino Maru Gothic Pro', "BIZ UDGothic", Roboto, Arial, sans-serif;
 	font-size: 14px;
 	line-height: 1.35;
 	text-size-adjust: 100%;
diff --git a/packages/sw/src/sw.ts b/packages/sw/src/sw.ts
index 46fe9fc90f..6bea359c26 100644
--- a/packages/sw/src/sw.ts
+++ b/packages/sw/src/sw.ts
@@ -35,7 +35,7 @@ async function offlineContentHTML() {
 		reload: i18n.ts?.reload ?? 'Reload',
 	};
 
-	return `<!DOCTYPE html><html lang="ja"><head><meta charset="UTF-8"><meta content="width=device-width,initial-scale=1"name="viewport"><title>${messages.title}</title><style>body{background-color:#0c1210;color:#dee7e4;font-family:Hiragino Maru Gothic Pro,BIZ UDGothic,Roboto,HelveticaNeue,Arial,sans-serif;line-height:1.35;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;margin:0;padding:24px;box-sizing:border-box}.icon{max-width:120px;width:100%;height:auto;margin-bottom:20px;}.message{text-align:center;font-size:20px;font-weight:700;margin-bottom:20px}.version{text-align:center;font-size:90%;margin-bottom:20px}button{padding:7px 14px;min-width:100px;font-weight:700;font-family:Hiragino Maru Gothic Pro,BIZ UDGothic,Roboto,HelveticaNeue,Arial,sans-serif;line-height:1.35;border-radius:99rem;background-color:#b4e900;color:#192320;border:none;cursor:pointer;-webkit-tap-highlight-color:transparent}button:hover{background-color:#c6ff03}</style></head><body><svg class="icon"fill="none"height="24"stroke="currentColor"stroke-linecap="round"stroke-linejoin="round"stroke-width="2"viewBox="0 0 24 24"width="24"xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z"fill="none"stroke="none"/><path d="M9.58 5.548c.24 -.11 .492 -.207 .752 -.286c1.88 -.572 3.956 -.193 5.444 1c1.488 1.19 2.162 3.007 1.77 4.769h.99c1.913 0 3.464 1.56 3.464 3.486c0 .957 -.383 1.824 -1.003 2.454m-2.997 1.033h-11.343c-2.572 -.004 -4.657 -2.011 -4.657 -4.487c0 -2.475 2.085 -4.482 4.657 -4.482c.13 -.582 .37 -1.128 .7 -1.62"/><path d="M3 3l18 18"/></svg><div class="message">${messages.header}</div><div class="version">v${_VERSION_}</div><button onclick="reloadPage()">${messages.reload}</button><script>function reloadPage(){location.reload(!0)}</script></body></html>`;
+	return `<!DOCTYPE html><html lang="ja"><head><meta charset="UTF-8"><meta content="width=device-width,initial-scale=1"name="viewport"><title>${messages.title}</title><style>body{background-color:#0c1210;color:#dee7e4;font-family:Segoe UI,HelveticaNeue,Hiragino Maru Gothic Pro,BIZ UDGothic,Roboto,Arial,sans-serif;line-height:1.35;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;margin:0;padding:24px;box-sizing:border-box}.icon{max-width:120px;width:100%;height:auto;margin-bottom:20px;}.message{text-align:center;font-size:20px;font-weight:700;margin-bottom:20px}.version{text-align:center;font-size:90%;margin-bottom:20px}button{padding:7px 14px;min-width:100px;font-weight:700;font-family:Segoe UI,HelveticaNeue,Hiragino Maru Gothic Pro,BIZ UDGothic,Roboto,Arial,sans-serif;line-height:1.35;border-radius:99rem;background-color:#b4e900;color:#192320;border:none;cursor:pointer;-webkit-tap-highlight-color:transparent}button:hover{background-color:#c6ff03}</style></head><body><svg class="icon"fill="none"height="24"stroke="currentColor"stroke-linecap="round"stroke-linejoin="round"stroke-width="2"viewBox="0 0 24 24"width="24"xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z"fill="none"stroke="none"/><path d="M9.58 5.548c.24 -.11 .492 -.207 .752 -.286c1.88 -.572 3.956 -.193 5.444 1c1.488 1.19 2.162 3.007 1.77 4.769h.99c1.913 0 3.464 1.56 3.464 3.486c0 .957 -.383 1.824 -1.003 2.454m-2.997 1.033h-11.343c-2.572 -.004 -4.657 -2.011 -4.657 -4.487c0 -2.475 2.085 -4.482 4.657 -4.482c.13 -.582 .37 -1.128 .7 -1.62"/><path d="M3 3l18 18"/></svg><div class="message">${messages.header}</div><div class="version">v${_VERSION_}</div><button onclick="reloadPage()">${messages.reload}</button><script>function reloadPage(){location.reload(!0)}</script></body></html>`;
 }
 
 globalThis.addEventListener('fetch', ev => {
