diff --git a/nowait-app-user-api/src/main/java/com/nowait/applicationuser/oauth/oauth2/OAuth2LoginSuccessHandler.java b/nowait-app-user-api/src/main/java/com/nowait/applicationuser/oauth/oauth2/OAuth2LoginSuccessHandler.java
index 13dc0ec..260b1b8 100644
--- a/nowait-app-user-api/src/main/java/com/nowait/applicationuser/oauth/oauth2/OAuth2LoginSuccessHandler.java
+++ b/nowait-app-user-api/src/main/java/com/nowait/applicationuser/oauth/oauth2/OAuth2LoginSuccessHandler.java
@@ -64,7 +64,7 @@ public void onAuthenticationSuccess(HttpServletRequest request, HttpServletRespo
 			.secure(false) // 운영환경에서는 true
 			.path("/")
 			.maxAge(30L * 24 * 60 * 60) // 30일 (초 단위)
-			.sameSite("Lax")
+			.sameSite("Strict")
 			.build();
 
 		// 기존 방식 대신 ResponseCookie.toString()을 헤더로 추가