diff --git a/src/AuditLog/AuditLog.php b/src/AuditLog/AuditLog.php
index 91df2f8..faf2407 100644
--- a/src/AuditLog/AuditLog.php
+++ b/src/AuditLog/AuditLog.php
@@ -3,10 +3,10 @@ namespace Misuzu\AuditLog;
 
 use InvalidArgumentException;
 use RuntimeException;
+use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
 use Index\Net\IPAddress;
-use Misuzu\DbStatementCache;
 use Misuzu\Pagination;
 use Misuzu\Users\User;
 
diff --git a/src/Changelog/Changelog.php b/src/Changelog/Changelog.php
index 2aa977b..6d39201 100644
--- a/src/Changelog/Changelog.php
+++ b/src/Changelog/Changelog.php
@@ -4,10 +4,10 @@ namespace Misuzu\Changelog;
 use InvalidArgumentException;
 use RuntimeException;
 use Index\DateTime;
+use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
-use Misuzu\DbStatementCache;
 use Misuzu\Pagination;
 use Misuzu\Users\User;
 
diff --git a/src/Comments/Comments.php b/src/Comments/Comments.php
index bb85365..f264942 100644
--- a/src/Comments/Comments.php
+++ b/src/Comments/Comments.php
@@ -3,9 +3,9 @@ namespace Misuzu\Comments;
 
 use InvalidArgumentException;
 use RuntimeException;
+use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
-use Misuzu\DbStatementCache;
 use Misuzu\Pagination;
 use Misuzu\Users\User;
 
diff --git a/src/Config/DbConfig.php b/src/Config/DbConfig.php
index 8133723..c2e2459 100644
--- a/src/Config/DbConfig.php
+++ b/src/Config/DbConfig.php
@@ -4,11 +4,11 @@ namespace Misuzu\Config;
 use RuntimeException;
 use InvalidArgumentException;
 use Index\Data\DataException;
+use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
 use Index\Data\IDbStatement;
 use Index\Data\IDbResult;
-use Misuzu\DbStatementCache;
 use Misuzu\Pagination;
 
 class DbConfig implements IConfig {
diff --git a/src/DbStatementCache.php b/src/DbStatementCache.php
deleted file mode 100644
index 3e0d3cd..0000000
--- a/src/DbStatementCache.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-namespace Misuzu;
-
-use Index\Data\IDbConnection;
-use Index\Data\IDbStatement;
-
-class DbStatementCache {
-    private IDbConnection $dbConn;
-    private array $stmts = [];
-
-    public function __construct(IDbConnection $dbConn) {
-        $this->dbConn = $dbConn;
-    }
-
-    private static function hash(string $query): string {
-        return hash('xxh3', $query, true);
-    }
-
-    public function get(string $query): IDbStatement {
-        $hash = self::hash($query);
-
-        if(array_key_exists($hash, $this->stmts)) {
-            $stmt = $this->stmts[$hash];
-            $stmt->reset();
-            return $stmt;
-        }
-
-        return $this->stmts[$hash] = $this->dbConn->prepare($query);
-    }
-
-    public function remove(string $query): void {
-        unset($this->stmts[self::hash($query)]);
-    }
-
-    public function clear(): void {
-        foreach($this->stmts as $stmt)
-            $stmt->close();
-        $this->stmts = [];
-    }
-}
diff --git a/src/Emoticons/Emotes.php b/src/Emoticons/Emotes.php
index 63b18c2..53b3222 100644
--- a/src/Emoticons/Emotes.php
+++ b/src/Emoticons/Emotes.php
@@ -3,8 +3,8 @@ namespace Misuzu\Emoticons;
 
 use InvalidArgumentException;
 use RuntimeException;
+use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
-use Misuzu\DbStatementCache;
 
 class Emotes {
     private const EMOTE_ORDER = [
diff --git a/src/News/News.php b/src/News/News.php
index 3bcc8c7..2042fa0 100644
--- a/src/News/News.php
+++ b/src/News/News.php
@@ -4,9 +4,9 @@ namespace Misuzu\News;
 use InvalidArgumentException;
 use RuntimeException;
 use Index\DateTime;
+use Index\Data\DbStatementCache;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
-use Misuzu\DbStatementCache;
 use Misuzu\Pagination;
 use Misuzu\Comments\CommentsCategoryInfo;
 use Misuzu\Users\User;
diff --git a/src/Profile/ProfileFields.php b/src/Profile/ProfileFields.php
index 6cc28d1..1268035 100644
--- a/src/Profile/ProfileFields.php
+++ b/src/Profile/ProfileFields.php
@@ -3,10 +3,10 @@ namespace Misuzu\Profile;
 
 use InvalidArgumentException;
 use RuntimeException;
+use Index\Data\DbStatementCache;
 use Index\Data\DbTools;
 use Index\Data\IDbConnection;
 use Index\Data\IDbResult;
-use Misuzu\DbStatementCache;
 use Misuzu\Users\User;
 
 class ProfileFields {