diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
new file mode 100644
index 0000000..71ce4e3
--- /dev/null
+++ b/.github/workflows/coding-standards.yml
@@ -0,0 +1,55 @@
+name: Coding Standards
+
+on:
+  push:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - phpcs.xml
+  pull_request:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - phpcs.xml
+      - '.github/workflows/**'
+  workflow_dispatch:
+
+jobs:
+  coding-standards:
+    name: Coding Standards
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          tools: cs2pr
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-interaction --no-progress --prefer-dist
+
+      - name: Validate composer.json
+        run: composer validate --strict
+
+      - name: Run PHP_CodeSniffer
+        run: ./vendor/bin/phpcs -q --no-colors --report=checkstyle src tests | cs2pr
diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
new file mode 100644
index 0000000..652f1e9
--- /dev/null
+++ b/.github/workflows/phpunit.yml
@@ -0,0 +1,75 @@
+name: PHPUnit
+
+on:
+  push:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - composer.json
+      - phpunit.xml.dist
+  pull_request:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - composer.json
+      - phpunit.xml.dist
+      - '.github/workflows/**'
+  workflow_dispatch:
+
+jobs:
+  phpunit:
+    name: PHPUnit
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        operating-system:
+          - ubuntu-latest
+        php-version:
+          - '7.3'
+          - '7.4'
+          - '8.0'
+        dependencies:
+          - lowest
+          - highest
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP, with composer and extensions
+        uses: shivammathur/setup-php@master
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: pcov
+          ini-values: zend.assertions=1
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install lowest dependencies
+        if: ${{ matrix.dependencies == 'lowest' }}
+        run: composer update --prefer-lowest --no-interaction --no-progress
+
+      - name: Install highest dependencies
+        if: ${{ matrix.dependencies == 'highest' }}
+        run: composer update --no-interaction --no-progress
+
+      - name: Run test suite
+        run: ./vendor/bin/phpunit --coverage-clover=coverage.xml --coverage-text
+
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.xml
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
new file mode 100644
index 0000000..1c2578a
--- /dev/null
+++ b/.github/workflows/static-analysis.yml
@@ -0,0 +1,156 @@
+name: Static Analysis
+
+on:
+  push:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - phpmd.xml
+      - phpstan.neon
+      - psalm.xml
+  pull_request:
+    branches:
+      - 1.x
+    paths:
+      - 'src/**'
+      - 'tests/**'
+      - phpmd.xml
+      - phpstan.neon
+      - psalm.xml
+      - '.github/workflows/**'
+  workflow_dispatch:
+
+jobs:
+  static-analysis-phpstan:
+    name: Static Analysis with PHPStan
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          tools: cs2pr
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-interaction --no-progress --prefer-dist
+
+      - name: Run PHPStan
+        run: ./vendor/bin/phpstan analyse -c phpstan.neon --no-progress --no-interaction --error-format=checkstyle | cs2pr
+
+  static-analysis-psalm:
+    name: Static Analysis with Psalm
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          tools: cs2pr
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Install dependencies
+        run: composer install --no-interaction --no-progress --prefer-dist
+
+      - name: Run Psalm
+        run: ./vendor/bin/psalm --show-info=false --output-format=checkstyle --shepherd | cs2pr
+
+  static-analysis-phpmd:
+    name: Static Analysis with PHPMD
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 7.4
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --no-interaction --no-progress --prefer-dist
+
+      - name: Run PHP Mess Detector
+        run: ./vendor/bin/phpmd src text --exclude src/Annotation ./phpmd.xml
+
+  static-analysis-php-metrics:
+    name: Static Analysis with PhpMetrics
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Install dependencies
+        run: composer install --no-interaction --no-progress --prefer-dist
+
+      - name: Run PhpMetrics
+        run: ./vendor/bin/phpmetrics --exclude=Exception src
+
+  static-analysis-composer-require-checker:
+    name: Static Analysis with ComposerRequireChecker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.0
+          coverage: none
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Install dependencies
+        run: |
+          composer install --no-interaction --no-progress --prefer-dist
+          composer require --dev maglnet/composer-require-checker ^3.0
+
+      - name: Run composer-require-checker
+        run: ./vendor/bin/composer-require-checker
diff --git a/codecov.yml b/codecov.yml
index 7a6ecf3..be3ee73 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -6,9 +6,9 @@ coverage:
   status:
     project:
       default:
-        target: 100%
+        target: 80%
     patch:
       default:
-        target: 100%
+        target: 80%
 
 comment: false
diff --git a/composer.json b/composer.json
index 9ab98c9..7ca6d0c 100644
--- a/composer.json
+++ b/composer.json
@@ -8,17 +8,19 @@
     "authors": [
         {
             "name": "Kenji Suzuki",
-            "email": "kenji.uui@gmail.com"
+            "homepage": "https://github.com/kenjis"
         }
     ],
     "require": {
-        "php": "^7.3 || ^8.0"
+        "php": "^7.3 || ^8.0",
+        "ext-openssl": "*",
+        "ext-tokenizer": "*",
+        "phpunit/phpunit": "^9.5",
+        "nikic/php-parser": "^4.10"
     },
     "require-dev": {
         "bamarni/composer-bin-plugin": "^1.4",
-        "phpunit/phpunit": "^9.5",
-        "kenjis/phpunit-helper": "^1.0",
-        "nikic/php-parser": "^4.10"
+        "kenjis/phpunit-helper": "^1.1"
     },
     "autoload": {
         "psr-4": {
@@ -51,7 +53,8 @@
         ],
         "sa": [
             "./vendor/bin/phpstan analyse -c phpstan.neon",
-            "psalm --show-info=true"
+            "psalm --show-info=true",
+            "./vendor/bin/phpmd src text ./phpmd.xml"
         ],
         "tests": [
             "@cs",
diff --git a/phpmd.xml b/phpmd.xml
index ddf1aed..7adba95 100644
--- a/phpmd.xml
+++ b/phpmd.xml
@@ -43,8 +43,8 @@
     <rule ref="rulesets/unusedcode.xml/UnusedPrivateMethod"/>
     <!--controversial-->
     <rule ref="rulesets/controversial.xml/CamelCaseClassName"/>
-    <rule ref="rulesets/controversial.xml/CamelCasePropertyName"/>
-    <rule ref="rulesets/controversial.xml/CamelCaseMethodName"/>
+<!--    <rule ref="rulesets/controversial.xml/CamelCasePropertyName"/>-->
+<!--    <rule ref="rulesets/controversial.xml/CamelCaseMethodName"/>-->
     <!--cleancode-->
     <rule ref="rulesets/cleancode.xml/BooleanArgumentFlag"/>
     <!-- <rule ref="rulesets/cleancode.xml/ElseExpression" /> -->
diff --git a/src/IncludeStream.php b/src/IncludeStream.php
index 53a98e7..1c6176b 100644
--- a/src/IncludeStream.php
+++ b/src/IncludeStream.php
@@ -69,6 +69,9 @@
 use const STREAM_OPTION_WRITE_BUFFER;
 use const STREAM_URL_STAT_QUIET;
 
+/**
+ * @SuppressWarnings(PHPMD)
+ */
 class IncludeStream
 {
     public const STREAM_OPEN_FOR_INCLUDE = 128;
diff --git a/src/MonkeyPatchManager.php b/src/MonkeyPatchManager.php
index 2dcec33..5fa392b 100644
--- a/src/MonkeyPatchManager.php
+++ b/src/MonkeyPatchManager.php
@@ -75,7 +75,7 @@ public static function log(string $message): void
         }
 
         $time = date('Y-m-d H:i:s');
-        [$usec, $sec] = explode(' ', microtime());
+        [$usec] = explode(' ', microtime());
         $usec = substr($usec, 1);
         $log = "[$time $usec] $message\n";
         file_put_contents(self::$log_file, $log, FILE_APPEND);
@@ -325,7 +325,7 @@ public static function patch(string $path)
         $source = file_get_contents($path);
         assert(is_string($source));
 
-        [$new_source, $patched] = self::execPatchers($source);
+        [$new_source] = self::execPatchers($source);
 
         // Write to cache file
         self::log('write_cache: ' . $path);
diff --git a/src/Traits/MonkeyPatchTrait.php b/src/Traits/MonkeyPatchTrait.php
index 5a752cc..c028880 100644
--- a/src/Traits/MonkeyPatchTrait.php
+++ b/src/Traits/MonkeyPatchTrait.php
@@ -14,7 +14,7 @@
 namespace Kenjis\MonkeyPatch\Traits;
 
 use Kenjis\MonkeyPatch\MonkeyPatch;
-use MonkeyPatchManager;
+use Kenjis\MonkeyPatch\MonkeyPatchManager;
 use PHPUnit\Framework\ExpectationFailedException;
 
 use function class_exists;
diff --git a/src/functions/exit__.php b/src/functions/exit__.php
index 30668d4..5d4c79b 100644
--- a/src/functions/exit__.php
+++ b/src/functions/exit__.php
@@ -12,6 +12,7 @@
  */
 
 use Kenjis\MonkeyPatch\Exception\ExitException;
+use Kenjis\MonkeyPatch\MonkeyPatchManager;
 
 /**
  * @param string|int|null $status
@@ -30,7 +31,7 @@ function exit__($status = null): void
         $message = 'exit() called in ' . $class . '::' . $method . '()';
     }
 
-    $exception_name = Kenjis\MonkeyPatch\MonkeyPatchManager::getExitExceptionClassname();
+    $exception_name = MonkeyPatchManager::getExitExceptionClassname();
 
     /**
      * @var ExitException
diff --git a/vendor-bin/tools/composer.lock b/vendor-bin/tools/composer.lock
index df17209..66672b2 100644
--- a/vendor-bin/tools/composer.lock
+++ b/vendor-bin/tools/composer.lock
@@ -3610,16 +3610,16 @@
         },
         {
             "name": "symfony/config",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
-                "reference": "50e0e1314a3b2609d32b6a5a0d0fb5342494c4ab"
+                "reference": "212d54675bf203ff8aef7d8cee8eecfb72f4a263"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/config/zipball/50e0e1314a3b2609d32b6a5a0d0fb5342494c4ab",
-                "reference": "50e0e1314a3b2609d32b6a5a0d0fb5342494c4ab",
+                "url": "https://api.github.com/repos/symfony/config/zipball/212d54675bf203ff8aef7d8cee8eecfb72f4a263",
+                "reference": "212d54675bf203ff8aef7d8cee8eecfb72f4a263",
                 "shasum": ""
             },
             "require": {
@@ -3668,7 +3668,7 @@
             "description": "Helps you find, load, combine, autofill and validate configuration values of any kind",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/config/tree/v5.2.3"
+                "source": "https://github.com/symfony/config/tree/v5.2.4"
             },
             "funding": [
                 {
@@ -3684,20 +3684,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-27T10:15:41+00:00"
+            "time": "2021-02-23T23:58:19+00:00"
         },
         {
             "name": "symfony/console",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "89d4b176d12a2946a1ae4e34906a025b7b6b135a"
+                "reference": "d6d0cc30d8c0fda4e7b213c20509b0159a8f4556"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/89d4b176d12a2946a1ae4e34906a025b7b6b135a",
-                "reference": "89d4b176d12a2946a1ae4e34906a025b7b6b135a",
+                "url": "https://api.github.com/repos/symfony/console/zipball/d6d0cc30d8c0fda4e7b213c20509b0159a8f4556",
+                "reference": "d6d0cc30d8c0fda4e7b213c20509b0159a8f4556",
                 "shasum": ""
             },
             "require": {
@@ -3765,7 +3765,7 @@
                 "terminal"
             ],
             "support": {
-                "source": "https://github.com/symfony/console/tree/v5.2.3"
+                "source": "https://github.com/symfony/console/tree/v5.2.4"
             },
             "funding": [
                 {
@@ -3781,20 +3781,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-28T22:06:19+00:00"
+            "time": "2021-02-23T10:08:49+00:00"
         },
         {
             "name": "symfony/dependency-injection",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dependency-injection.git",
-                "reference": "62f72187be689540385dce6c68a5d4c16f034139"
+                "reference": "f7d89110c55d88620dc811f342f94393b8a045d4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/62f72187be689540385dce6c68a5d4c16f034139",
-                "reference": "62f72187be689540385dce6c68a5d4c16f034139",
+                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/f7d89110c55d88620dc811f342f94393b8a045d4",
+                "reference": "f7d89110c55d88620dc811f342f94393b8a045d4",
                 "shasum": ""
             },
             "require": {
@@ -3812,7 +3812,7 @@
             },
             "provide": {
                 "psr/container-implementation": "1.0",
-                "symfony/service-implementation": "1.0"
+                "symfony/service-implementation": "1.0|2.0"
             },
             "require-dev": {
                 "symfony/config": "^5.1",
@@ -3852,7 +3852,7 @@
             "description": "Allows you to standardize and centralize the way objects are constructed in your application",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/dependency-injection/tree/v5.2.3"
+                "source": "https://github.com/symfony/dependency-injection/tree/v5.2.4"
             },
             "funding": [
                 {
@@ -3868,7 +3868,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-27T12:56:27+00:00"
+            "time": "2021-03-04T15:41:09+00:00"
         },
         {
             "name": "symfony/deprecation-contracts",
@@ -3939,16 +3939,16 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "4f9760f8074978ad82e2ce854dff79a71fe45367"
+                "reference": "d08d6ec121a425897951900ab692b612a61d6240"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/4f9760f8074978ad82e2ce854dff79a71fe45367",
-                "reference": "4f9760f8074978ad82e2ce854dff79a71fe45367",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/d08d6ec121a425897951900ab692b612a61d6240",
+                "reference": "d08d6ec121a425897951900ab692b612a61d6240",
                 "shasum": ""
             },
             "require": {
@@ -4004,7 +4004,7 @@
             "description": "Provides tools that allow your application components to communicate with each other by dispatching events and listening to them",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/event-dispatcher/tree/v5.2.3"
+                "source": "https://github.com/symfony/event-dispatcher/tree/v5.2.4"
             },
             "funding": [
                 {
@@ -4020,7 +4020,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-27T10:36:42+00:00"
+            "time": "2021-02-18T17:12:37+00:00"
         },
         {
             "name": "symfony/event-dispatcher-contracts",
@@ -4103,16 +4103,16 @@
         },
         {
             "name": "symfony/filesystem",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "262d033b57c73e8b59cd6e68a45c528318b15038"
+                "reference": "710d364200997a5afde34d9fe57bd52f3cc1e108"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/262d033b57c73e8b59cd6e68a45c528318b15038",
-                "reference": "262d033b57c73e8b59cd6e68a45c528318b15038",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/710d364200997a5afde34d9fe57bd52f3cc1e108",
+                "reference": "710d364200997a5afde34d9fe57bd52f3cc1e108",
                 "shasum": ""
             },
             "require": {
@@ -4145,7 +4145,7 @@
             "description": "Provides basic utilities for the filesystem",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/filesystem/tree/v5.2.3"
+                "source": "https://github.com/symfony/filesystem/tree/v5.2.4"
             },
             "funding": [
                 {
@@ -4161,20 +4161,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-27T10:01:46+00:00"
+            "time": "2021-02-12T10:38:38+00:00"
         },
         {
             "name": "symfony/finder",
-            "version": "v5.2.3",
+            "version": "v5.2.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
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@@ -4222,11 +4222,11 @@
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@@ -5191,7 +5191,7 @@
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@@ -5207,7 +5207,7 @@
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