diff --git a/packages/backend/src/misc/safe-for-sql.ts b/packages/backend/src/misc/safe-for-sql.ts
deleted file mode 100644
index 02eb7f0a2..000000000
--- a/packages/backend/src/misc/safe-for-sql.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function safeForSql(text: string): boolean {
-	return !/[\0\x08\x09\x1a\n\r"'\\\%]/g.test(text);
-}
diff --git a/packages/backend/src/server/api/endpoints/hashtags/trend.ts b/packages/backend/src/server/api/endpoints/hashtags/trend.ts
index b6943dd08..a68b9c48c 100644
--- a/packages/backend/src/server/api/endpoints/hashtags/trend.ts
+++ b/packages/backend/src/server/api/endpoints/hashtags/trend.ts
@@ -3,7 +3,6 @@ import { MINUTE, HOUR } from '@/const.js';
 import { fetchMeta } from '@/misc/fetch-meta.js';
 import { Notes } from '@/models/index.js';
 import { Note } from '@/models/entities/note.js';
-import { safeForSql } from '@/misc/safe-for-sql.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import define from '../../define.js';
 
@@ -122,7 +121,7 @@ export default define(meta, paramDef, async () => {
 	for (let i = 0; i < range; i++) {
 		countPromises.push(Promise.all(hots.map(tag => Notes.createQueryBuilder('note')
 			.select('count(distinct note.userId)')
-			.where(`'{"${safeForSql(tag) ? tag : 'aichan_kawaii'}"}' <@ note.tags`)
+			.where(':tag = ANY(note.tags)', { tag })
 			.andWhere('note.createdAt < :lt', { lt: new Date(now.getTime() - (interval * i)) })
 			.andWhere('note.createdAt > :gt', { gt: new Date(now.getTime() - (interval * (i + 1))) })
 			.cache(60000) // 1 min
@@ -136,7 +135,7 @@ export default define(meta, paramDef, async () => {
 
 	const totalCounts = await Promise.all(hots.map(tag => Notes.createQueryBuilder('note')
 		.select('count(distinct note.userId)')
-		.where(`'{"${safeForSql(tag) ? tag : 'aichan_kawaii'}"}' <@ note.tags`)
+		.where(':tag = ANY(note.tags)', { tag })
 		.andWhere('note.createdAt > :gt', { gt: new Date(now.getTime() - rangeA) })
 		.cache(60000 * 60) // 60 min
 		.getRawOne()
diff --git a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
index 4f4711491..e0bdca6cb 100644
--- a/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search-by-tag.ts
@@ -1,6 +1,5 @@
 import { Brackets } from 'typeorm';
 import { Notes } from '@/models/index.js';
-import { safeForSql } from '@/misc/safe-for-sql.js';
 import { normalizeForSearch } from '@/misc/normalize-for-search.js';
 import define from '../../define.js';
 import { makePaginationQuery } from '../../common/make-pagination-query.js';
@@ -86,15 +85,14 @@ export default define(meta, paramDef, async (ps, me) => {
 
 	try {
 		if (ps.tag) {
-			if (!safeForSql(ps.tag)) throw new Error('Injection');
-			query.andWhere(`'{"${normalizeForSearch(ps.tag)}"}' <@ note.tags`);
+			query.andWhere(':tag = ANY(note.tags)', { tag: normalizeForSearch(ps.tag) });
 		} else {
+			let i = 0;
 			query.andWhere(new Brackets(qb => {
 				for (const tags of ps.query!) {
 					qb.orWhere(new Brackets(qb => {
 						for (const tag of tags) {
-							if (!safeForSql(tag)) throw new Error('Injection');
-							qb.andWhere(`'{"${normalizeForSearch(tag)}"}' <@ note.tags`);
+							qb.andWhere(`:tag${++i} = ANY(note.tags)`, { ['tag' + i]: normalizeForSearch(tag) });
 						}
 					}));
 				}