diff --git a/infra/docker/development/sls-create/Dockerfile b/infra/docker/development/sls-create/Dockerfile
index 07697c0..0ffcb27 100644
--- a/infra/docker/development/sls-create/Dockerfile
+++ b/infra/docker/development/sls-create/Dockerfile
@@ -13,7 +13,7 @@ RUN apt-get update && apt-get install -y \
 # Node.jsのインストール（Serverless Framework用）
 RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
     apt-get install -y nodejs && \
-    npm install -g serverless@4
+    npm install -g serverless@3
 
 # AWS CLIのインストール
 RUN curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" && \
diff --git a/infra/docker/development/sls-deploy/Dockerfile b/infra/docker/development/sls-deploy/Dockerfile
index bc8a639..f35e312 100644
--- a/infra/docker/development/sls-deploy/Dockerfile
+++ b/infra/docker/development/sls-deploy/Dockerfile
@@ -13,7 +13,7 @@ RUN apt-get update && apt-get install -y \
 # Node.jsのインストール（Serverless Framework用）
 RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
     apt-get install -y nodejs && \
-    npm install -g serverless@4
+    npm install -g serverless@3
 
 # AWS CLIのインストール
 RUN curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" && \
diff --git a/serverless/package-lock.json b/serverless/package-lock.json
index 259dcc1..a5677f9 100644
--- a/serverless/package-lock.json
+++ b/serverless/package-lock.json
@@ -5,6 +5,7 @@
   "packages": {
     "": {
       "devDependencies": {
+        "serverless-better-credentials": "^2.0.1",
         "serverless-domain-manager": "^8.0.0",
         "serverless-iam-roles-per-function": "^3.2.0",
         "serverless-lambda-edge-pre-existing-cloudfront": "^1.2.0",
@@ -4521,7 +4522,6 @@
       "integrity": "sha512-Ds09qNh8yw3khSjiJjiUInaGX9xlqZDY7JVryGxdxV7NPeuqQfplOpQ66yJFZut3jLa5zOwkXw1g9EI2uKh4Og==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=8"
       }
@@ -7605,7 +7605,6 @@
       "integrity": "sha512-7x81NCL719oNbsq/3mh+hVrAWmFuEYUqrq/Iw3kUzH8ReypT9QQ0BLoJS7/G9k6N81XjW4qHWtjWwe/9eLy1EQ==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "define-lazy-prop": "^2.0.0",
         "is-docker": "^2.1.1",
@@ -8779,6 +8778,24 @@
         "node": ">=12.0"
       }
     },
+    "node_modules/serverless-better-credentials": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/serverless-better-credentials/-/serverless-better-credentials-2.0.1.tgz",
+      "integrity": "sha512-CKRb+zP8HwThk2nD1t7kNHXn2bTYuPqaGvOnJ+PQq65wvJrLXbid6zZeSeaN506VpUp7zkOXgH8Qs3XGtK8dVA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "open": "^8.4.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "peerDependencies": {
+        "@serverless/utils": "^6.0.2",
+        "aws-sdk": "^2.567.0",
+        "serverless": "^2 || ^3"
+      }
+    },
     "node_modules/serverless-domain-manager": {
       "version": "8.0.0",
       "resolved": "https://registry.npmjs.org/serverless-domain-manager/-/serverless-domain-manager-8.0.0.tgz",
diff --git a/serverless/package.json b/serverless/package.json
index fdc6c8e..a537739 100644
--- a/serverless/package.json
+++ b/serverless/package.json
@@ -1,5 +1,6 @@
 {
   "devDependencies": {
+    "serverless-better-credentials": "^2.0.1",
     "serverless-domain-manager": "^8.0.0",
     "serverless-iam-roles-per-function": "^3.2.0",
     "serverless-lambda-edge-pre-existing-cloudfront": "^1.2.0",
diff --git a/serverless/serverless-global.yml b/serverless/serverless-global.yml
index 4a4aeb7..65d4b69 100644
--- a/serverless/serverless-global.yml
+++ b/serverless/serverless-global.yml
@@ -50,13 +50,10 @@ custom:
     includeLayers: true
     number: 3
 
-stages:
-  default:
-    params: ${file(./.env.${sls:stage}.yml)}
-  stg:
-    params: ${file(./.env.stg.yml)}
-  prd:
-    params: ${file(./.env.prd.yml)}
+params:
+  default: ${file(./.env.${sls:stage}.yml)}
+  stg: ${file(./.env.stg.yml)}
+  prd: ${file(./.env.prd.yml)}
 
 resources:
   Resources:
@@ -111,6 +108,7 @@ resources:
         Name: ${self:service}-${sls:stage}-lambda-edge-function-arn
 
 plugins:
+  - serverless-better-credentials
   # - serverless-iam-roles-per-function # roleごと置き換えるので使用せず
   - serverless-prune-plugin
   # - serverless-lambda-edge-pre-existing-cloudfront # Cloudformation管理ではなさそうなので自分で制御する
diff --git a/serverless/serverless.yml b/serverless/serverless.yml
index 3d6e6eb..a2ec258 100644
--- a/serverless/serverless.yml
+++ b/serverless/serverless.yml
@@ -3,12 +3,14 @@
 # "service" is the name of this project. This will also be added to your AWS resource names.
 service: pj-name-serverless
 
+frameworkVersion: "3"
+
 provider:
   name: aws
   stage: stg
   region: ap-northeast-1
   #  以下はlambdaのデフォルト設定(置き換えのものもマージのものもある)
-  runtime: python3.12
+  runtime: python3.11
   # memorySize: 128
   # timeout: 10
   # environment:
@@ -453,14 +455,10 @@ custom:
     securityPolicy: tls_1_2
     apiType: http
     autoDomain: false
-
-stages:
-  default:
-    params: ${file(./.env.${sls:stage}.yml)}
-  stg:
-    params: ${file(./.env.stg.yml)}
-  prd:
-    params: ${file(./.env.prd.yml)}
+params:
+  default: ${file(./.env.${sls:stage}.yml)}
+  stg: ${file(./.env.stg.yml)}
+  prd: ${file(./.env.prd.yml)}
 
 resources:
   Resources:
@@ -935,6 +933,7 @@ resources:
       Value: !Ref S3Bucket2
 
 plugins:
+  - serverless-better-credentials
   - serverless-iam-roles-per-function
   - serverless-python-requirements
   - serverless-prune-plugin