diff --git a/ecs/export-dbdump/Dockerfile b/ecs/export-dbdump/Dockerfile
index 140de9c6..858c3dc9 100644
--- a/ecs/export-dbdump/Dockerfile
+++ b/ecs/export-dbdump/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9-bullseye
+FROM python:3.9
 
 ENV TZ="Asia/Tokyo"
 
diff --git a/ecs/jskult-dbdump/Dockerfile b/ecs/jskult-dbdump/Dockerfile
index 140de9c6..858c3dc9 100644
--- a/ecs/jskult-dbdump/Dockerfile
+++ b/ecs/jskult-dbdump/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9-bullseye
+FROM python:3.9
 
 ENV TZ="Asia/Tokyo"
 
diff --git a/ecs/jskult-restore-backup/Dockerfile b/ecs/jskult-restore-backup/Dockerfile
index 140de9c6..858c3dc9 100644
--- a/ecs/jskult-restore-backup/Dockerfile
+++ b/ecs/jskult-restore-backup/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9-bullseye
+FROM python:3.9
 
 ENV TZ="Asia/Tokyo"
 
diff --git a/ecs/restore-dbdump/Dockerfile b/ecs/restore-dbdump/Dockerfile
index 140de9c6..858c3dc9 100644
--- a/ecs/restore-dbdump/Dockerfile
+++ b/ecs/restore-dbdump/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.9-bullseye
+FROM python:3.9
 
 ENV TZ="Asia/Tokyo"