diff --git a/dislocker_client.py b/dislocker_client.py
index 9692ad2..9fb2798 100644
--- a/dislocker_client.py
+++ b/dislocker_client.py
@@ -80,7 +80,7 @@ class Lock(customtkinter.CTkToplevel):
         self.input_frame  = customtkinter.CTkFrame(self, corner_radius=0, fg_color='transparent')
         self.input_frame.grid(row=2, column=0, sticky="nsew")
 
-        self.password_entry = customtkinter.CTkEntry(self.input_frame, placeholder_text='パスワード', width=380)
+        self.password_entry = customtkinter.CTkEntry(self.input_frame, placeholder_text='パスワード', width=380, show='*')
         self.password_entry.grid(row=0, column=0, padx=10, pady=10)
 
         self.button_frame = customtkinter.CTkFrame(self, corner_radius=0, fg_color='transparent')