diff --git a/.devcontainer.example/Dockerfile b/.devcontainer.example/Dockerfile
deleted file mode 100644
index 128993d..0000000
--- a/.devcontainer.example/Dockerfile
+++ /dev/null
@@ -1,6 +0,0 @@
-FROM dev-toys-web-dev:2.0.0
-
-RUN apt-get update \
-  && apt-get install --no-install-recommends -y git ca-certificates fish \
-  && apt-get clean \
-  && rm -rf /var/lib/apt/lists/*
diff --git a/.devcontainer.example/devcontainer.json b/.devcontainer.example/devcontainer.json
deleted file mode 100644
index 0729b22..0000000
--- a/.devcontainer.example/devcontainer.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "name": "DevToysWeb",
-  "dockerComposeFile": ["../docker-compose.yml", "docker-compose.yml"],
-  "service": "app",
-  "workspaceFolder": "/app",
-  "customizations": {
-    "vscode": {
-      "settings": {
-        "terminal.integrated.defaultProfile.linux": "fish",
-        "terminal.integrated.profiles.linux": {
-          "fish": {
-            "path": "/usr/bin/fish",
-            "args": ["-l"]
-          }
-        }
-      },
-      "extensions": [
-        "bierner.github-markdown-preview",
-        "davidanson.vscode-markdownlint",
-        "irongeek.vscode-env",
-        "dbaeumer.vscode-eslint",
-        "mhutchie.git-graph",
-        "ms-ceintl.vscode-language-pack-ja",
-        "ms-azuretools.vscode-docker",
-        "esbenp.prettier-vscode",
-        "artdiniz.quitcontrol-vscode",
-        "bradlc.vscode-tailwindcss"
-      ]
-    }
-  },
-  "runServices": ["app"],
-  "shutdownAction": "stopCompose"
-}
diff --git a/.devcontainer.example/docker-compose.yml b/.devcontainer.example/docker-compose.yml
deleted file mode 100644
index a437e8c..0000000
--- a/.devcontainer.example/docker-compose.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-version: "3.9"
-
-services:
-  app:
-    image: xxx/dev-toys-web-dev:2.0.0
-    build:
-      context: .devcontainer
-    command: sleep infinity
diff --git a/.env.example b/.env.example
deleted file mode 100644
index b368072..0000000
--- a/.env.example
+++ /dev/null
@@ -1 +0,0 @@
-APP_PORT=3000
diff --git a/.gitignore b/.gitignore
index 42f45e8..8934c12 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,13 +33,9 @@ yarn-error.log*
 .turbo
 
 .contentlayer
-.env
 
 # typescript
 tsconfig.tsbuildinfo
 
 # eslint
 .eslintcache
-
-# devcontainer
-.devcontainer
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 359e733..00a3d91 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -4,7 +4,6 @@
     "davidanson.vscode-markdownlint",
     "irongeek.vscode-env",
     "dbaeumer.vscode-eslint",
-    "ms-azuretools.vscode-docker",
     "esbenp.prettier-vscode",
     "bradlc.vscode-tailwindcss"
   ]
diff --git a/README.md b/README.md
index 6ad59cc..2b51776 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@
 
 A web clone of [DevToys](https://github.com/veler/DevToys)
 
+## Setup
+
+To reproduce environment, use [VOLTA](https://volta.sh/)
+
 ## Known issues
 
 - Tool search does not set query parameters
diff --git a/docker-compose.yml b/docker-compose.yml
deleted file mode 100644
index ccdcc66..0000000
--- a/docker-compose.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-version: "3.9"
-
-services:
-  app:
-    image: dev-toys-web-dev:2.0.0
-    build:
-      context: docker
-    working_dir: /app
-    volumes:
-      - .:/app
-      - next:/app/.next
-      - node_modules:/app/node_modules
-      - yarn-cache:/usr/local/share/.cache/yarn/v6
-    command: sh -c "yarn && yarn dev"
-    ports:
-      - ${APP_PORT:-3000}:3000
-
-volumes:
-  next:
-  node_modules:
-  yarn-cache:
diff --git a/docker/Dockerfile b/docker/Dockerfile
deleted file mode 100644
index 6c1725d..0000000
--- a/docker/Dockerfile
+++ /dev/null
@@ -1 +0,0 @@
-FROM node:18.16.0-bullseye-slim
diff --git a/package.json b/package.json
index cb9e2fd..e41e089 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,10 @@
 {
   "license": "MIT",
   "private": true,
+  "volta": {
+    "node": "18.16.0",
+    "yarn": "1.22.19"
+  },
   "scripts": {
     "dev": "next dev",
     "build": "next build",