diff --git a/README.md b/README.md
index e907ec1..9bf2a47 100644
--- a/README.md
+++ b/README.md
@@ -15,27 +15,27 @@
 
 테스트를 위해 pg1 서버의 postgresql 서비스 종료
 <p align="center">
-    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_1.jpg" alt="pg" width="800">
+    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_1.png" alt="pg" width="800">
 </p>
 
 종료 후 접속되지 않는 pg1 서버의 postgresql 서비스
 <p align="center">
-    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_2.jpg" alt="pg" width="800">
+    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_2.png" alt="pg" width="800">
 </p>
 
 `user4` 테이블 생성
 <p align="center">
-    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_3.jpg" alt="pg" width="800">
+    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_3.png" alt="pg" width="800">
 </p>
 
 pg1 서버의 postgresql 서비스 `recovery` 명령어 실행 & 서비스 복구 성공
 <p align="center">
-    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_4.jpg" alt="pg" width="800">
+    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_4.png" alt="pg" width="800">
 </p>
 
 pg1 서버의 postgresql 서비스 복구 후 생성된 `user4` 확인
 <p align="center">
-    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_5.jpg" alt="pg" width="800">
+    <img src="https://gitea.rsonesoft.com/bigdeejay/pgpool_watchdog_setup_example/raw/branch/main/recovery_5.png" alt="pg" width="800">
 </p>
 
 # 설치환경