diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7b817f4..dffef30 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -13,7 +13,7 @@ jobs:
         strategy:
             matrix:
                 os: [ubuntu-latest]
-                eslint: [6]
+                eslint: [7]
                 node: [12.22.0, 12, 14.17.0, 14, 16, 18]
                 include:
                     # On other platforms
@@ -21,6 +21,9 @@ jobs:
                       node: 18
                     - os: macos-latest
                       node: 18
+                    # On old ESLint versions
+                    - eslint: 6
+                      node: 18
                     # On the minimum supported ESLint/Node.js version
                     - eslint: 6.6.0
                       node: 12.22.0
diff --git a/README.md b/README.md
index b20a186..0ea9975 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ npm install --save-dev eslint @mysticatea/eslint-plugin
 ### Requirements
 
 -   Node.js `^12.22.0 || ^14.17.0 || >=16.0.0` or newer versions.
--   ESLint `^6.6.0` or newer versions.
+-   ESLint `^6.6.0 || ^7.0.0` or newer versions.
 
 ## 📖 Usage
 
diff --git a/lib/configs/_base.js b/lib/configs/_base.js
index 7708e61..8f55027 100644
--- a/lib/configs/_base.js
+++ b/lib/configs/_base.js
@@ -26,6 +26,7 @@ module.exports = {
         camelcase: "error",
         "consistent-return": "error",
         curly: "error",
+        "default-case-last": "error",
         "default-case": "error",
         "default-param-last": "error",
         "dot-notation": "error",
@@ -92,6 +93,7 @@ module.exports = {
         "no-lone-blocks": "error",
         "no-lonely-if": "error",
         "no-loop-func": "error",
+        "no-loss-of-precision": "error",
         "no-misleading-character-class": "error",
         "no-mixed-operators": [
             "error",
@@ -106,12 +108,14 @@ module.exports = {
         "no-new-object": "error",
         "no-new-require": "error",
         "no-new-wrappers": "error",
+        "no-nonoctal-decimal-escape": "error",
         "no-obj-calls": "error",
         "no-octal": "error",
         "no-octal-escape": "error",
         "no-param-reassign": ["error", { props: false }],
         "no-process-env": "error",
         "no-process-exit": "error",
+        "no-promise-executor-return": "error",
         "no-prototype-builtins": "error",
         "no-redeclare": ["error", { builtinGlobals: true }],
         "no-regex-spaces": "error",
@@ -141,9 +145,11 @@ module.exports = {
         "no-unexpected-multiline": "error",
         "no-unmodified-loop-condition": "error",
         "no-unneeded-ternary": "error",
+        "no-unreachable-loop": "error",
         "no-unreachable": "error",
         "no-unsafe-finally": "error",
         "no-unsafe-negation": ["error", { enforceForOrderingRelations: true }],
+        "no-unsafe-optional-chaining": "error",
         "no-unused-expressions": "error",
         "no-unused-labels": "error",
         "no-unused-vars": [
@@ -157,6 +163,7 @@ module.exports = {
             },
         ],
         "no-use-before-define": ["error", "nofunc"],
+        "no-useless-backreference": "error",
         "no-useless-call": "error",
         "no-useless-catch": "error",
         "no-useless-concat": "error",
@@ -299,6 +306,7 @@ module.exports = {
         "guard-for-in": "off",
         "handle-callback-err": "off",
         "id-blacklist": "off",
+        "id-denylist": "off",
         "id-length": "off",
         "id-match": "off",
         "line-comment-position": "off",
@@ -332,6 +340,7 @@ module.exports = {
         "no-path-concat": "off",
         "no-plusplus": "off",
         "no-proto": "off",
+        "no-restricted-exports": "off",
         "no-restricted-globals": "off",
         "no-restricted-imports": "off",
         "no-restricted-modules": "off",
@@ -392,6 +401,7 @@ module.exports = {
                 ],
             },
         ],
+        // "@mysticatea/eslint-comments/require-description": "error",
         "@mysticatea/eslint-comments/require-description": "off",
 
         // prettier
diff --git a/lib/configs/_override-special.js b/lib/configs/_override-special.js
index 17916c0..e24a2fa 100644
--- a/lib/configs/_override-special.js
+++ b/lib/configs/_override-special.js
@@ -18,7 +18,6 @@ module.exports = {
             extends: [require.resolve("./+node.js")],
             rules: {
                 "no-console": "off",
-                "no-process-env": "off",
             },
         },
         {
@@ -33,7 +32,6 @@ module.exports = {
             ],
             rules: {
                 "no-console": "off",
-                "no-process-env": "off",
             },
         },
     ],
diff --git a/package.json b/package.json
index 91089ad..d4d4a40 100644
--- a/package.json
+++ b/package.json
@@ -10,9 +10,10 @@
     "lib"
   ],
   "peerDependencies": {
-    "eslint": ">=6.6.0"
+    "eslint": "^6.6.0 || ^7.0.0"
   },
   "dependencies": {
+    "@eslint/eslintrc": "^0.4.3",
     "@typescript-eslint/eslint-plugin": "^4.33.0",
     "@typescript-eslint/parser": "^4.33.0",
     "eslint-plugin-eslint-comments": "^3.2.0",
@@ -26,7 +27,7 @@
   "devDependencies": {
     "@mysticatea/eslint-plugin": "file:.",
     "codecov": "^3.8.3",
-    "eslint": "^6.8.0",
+    "eslint": "^7.32.0",
     "globals": "^13.17.0",
     "mocha": "^9.2.2",
     "npm-run-all": "^4.1.5",
diff --git a/tests/lib/configs/_rules.js b/tests/lib/configs/_rules.js
index cbd9afe..5e3cfec 100644
--- a/tests/lib/configs/_rules.js
+++ b/tests/lib/configs/_rules.js
@@ -7,7 +7,7 @@
 const { Linter } = require("eslint")
 const {
     ConfigArrayFactory,
-} = require("eslint/lib/cli-engine/config-array-factory")
+} = require("@eslint/eslintrc/lib/config-array-factory")
 const Validator = require("eslint/lib/shared/config-validator")
 const { rules: removedRules } = require("eslint/conf/replacements.json")
 const { rules: PluginRulesIndex } = require("@mysticatea/eslint-plugin")