diff --git a/db.php b/db.php
index d4c8138..1f7e265 100644
--- a/db.php
+++ b/db.php
@@ -148,7 +148,7 @@ function initDatabase(): void {
             PRIMARY KEY (user_id, company_id),
             FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
             FOREIGN KEY (company_id) REFERENCES companies(id) ON DELETE CASCADE
-        ) ENGINE=InnoDB",
+        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4",
 
         "CREATE TABLE IF NOT EXISTS user_signatures (
             id INT AUTO_INCREMENT PRIMARY KEY,
@@ -170,14 +170,14 @@ function initDatabase(): void {
             token VARCHAR(64) NOT NULL UNIQUE,
             created_at DATETIME NOT NULL,
             FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
-        ) ENGINE=InnoDB",
+        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4",
 
         "CREATE TABLE IF NOT EXISTS login_attempts (
             id INT AUTO_INCREMENT PRIMARY KEY,
             ip VARCHAR(45) NOT NULL,
             attempted_at DATETIME NOT NULL,
             INDEX idx_ip_time (ip, attempted_at)
-        ) ENGINE=InnoDB",
+        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4",
 
         "CREATE TABLE IF NOT EXISTS customers (
             id VARCHAR(20) PRIMARY KEY,