diff --git a/main.py b/main.py
index 24ec25d..0a3e03c 100644
--- a/main.py
+++ b/main.py
@@ -59,7 +59,7 @@ def list():
 @app.route("/list/user", methods=['GET'])
 def user_info():
     username = request.args.get("user")
-    c.execute("SELECT * FROM users WHERE username = '%s'" % username)
+    c.execute("SELECT * FROM users WHERE username = '%(username)s'", {'username':username})
     user_list = c.fetchall()
     if user_list != []:
         user = user_list[0]
@@ -114,7 +114,7 @@ def adduser():
     user = request.args.get("username")
     c.execute(f"SELECT * FROM users WHERE username='{str(user)}'") 
     if c.fetchall() == []:
-        c.execute("INSERT or IGNORE INTO users (username, balance) VALUES ('%s', 0)" % user)
+        c.execute("INSERT or IGNORE INTO users (username, balance) VALUES ('%(user)s', 0)", {'user' : user} )
         conn.commit()
         return 'Added user <a href="/list">user and tag list</a> <p>The creator of this website accepts no liability for any linguistic or technical errors!</p>'
     else: