diff --git a/packages/client/src/init.ts b/packages/client/src/init.ts
index 53d2062e15..c413fa37e4 100644
--- a/packages/client/src/init.ts
+++ b/packages/client/src/init.ts
@@ -40,7 +40,6 @@ import { i18n } from "@/i18n";
 import { fetchInstance, instance } from "@/instance";
 import { isSignedIn, me } from "@/me";
 import { alert, api, confirm, popup, post, toast } from "@/os";
-import { compareFirefishVersions } from "@/scripts/compare-versions";
 import { deviceKind } from "@/scripts/device-kind";
 import { getAccountFromId } from "@/scripts/get-account-from-id";
 import { makeHotkey } from "@/scripts/hotkey";
@@ -246,11 +245,7 @@ function checkForSplash() {
 
 		try {
 			// 変なバージョン文字列来るとcompareVersionsでエラーになるため
-			if (
-				lastVersion != null &&
-				compareFirefishVersions(lastVersion, version) === 1 &&
-				defaultStore.state.showUpdates
-			) {
+			if (lastVersion < version && defaultStore.state.showUpdates) {
 				// ログインしてる場合だけ
 				if (me) {
 					popup(
diff --git a/packages/client/src/pages/admin/index.vue b/packages/client/src/pages/admin/index.vue
index 53cdad840f..701a63e6c2 100644
--- a/packages/client/src/pages/admin/index.vue
+++ b/packages/client/src/pages/admin/index.vue
@@ -85,7 +85,6 @@ import {
 	provideMetadataReceiver,
 } from "@/scripts/page-metadata";
 import icon from "@/scripts/icon";
-import { compareFirefishVersions } from "@/scripts/compare-versions";
 
 const isEmpty = (x: string | null) => x == null || x === "";
 const el = ref<HTMLElement | null>(null);
@@ -122,8 +121,7 @@ os.api("admin/abuse-user-reports", {
 
 if (defaultStore.state.showAdminUpdates) {
 	os.api("latest-version").then((res) => {
-		updateAvailable.value =
-			compareFirefishVersions(version, res?.latest_version) === 1;
+		updateAvailable.value = version < res?.latest_version;
 	});
 }
 
diff --git a/packages/client/src/scripts/compare-versions.ts b/packages/client/src/scripts/compare-versions.ts
deleted file mode 100644
index 7b232db838..0000000000
--- a/packages/client/src/scripts/compare-versions.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-const less = -1;
-const same = 0;
-const more = 1;
-
-export const compareFirefishVersions = (
-	oldVersion: string,
-	newVersion: string,
-) => {
-	if (oldVersion === newVersion) return same;
-
-	const o = oldVersion.split("-");
-	const n = newVersion.split("-");
-
-	if (o[0] < n[0]) return more;
-	if (o[0] === n[0] && o[1] == null && n[1] != null) return more;
-	if (o[0] === n[0] && o[1] != null && n[1] != null && o[1] < n[1]) return more;
-
-	return less;
-};
diff --git a/packages/client/src/ui/_common_/navbar.vue b/packages/client/src/ui/_common_/navbar.vue
index e2937528de..0251a38c6a 100644
--- a/packages/client/src/ui/_common_/navbar.vue
+++ b/packages/client/src/ui/_common_/navbar.vue
@@ -162,7 +162,6 @@ import { i18n } from "@/i18n";
 import { instance } from "@/instance";
 import { version } from "@/config";
 import icon from "@/scripts/icon";
-import { compareFirefishVersions } from "@/scripts/compare-versions";
 
 const isEmpty = (x: string | null) => x == null || x === "";
 
@@ -212,8 +211,7 @@ if (isAdmin) {
 
 if (defaultStore.state.showAdminUpdates) {
 	os.api("latest-version").then((res) => {
-		updateAvailable.value =
-			compareFirefishVersions(version, res?.latest_version) === 1;
+		updateAvailable.value = version < res?.latest_version;
 	});
 }