diff --git a/.gitignore b/.gitignore
index 5819720..34b0bbe 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 composer.lock
 .php-version
+.tool-versions
 /vendor
 /.phpunit.cache
 .phpunit.result.cache
diff --git a/PHP_VERSIONS b/PHP_VERSIONS
index 4215b26..75df3c4 100644
--- a/PHP_VERSIONS
+++ b/PHP_VERSIONS
@@ -1,3 +1,4 @@
+8.4
 8.3
 8.2
 8.1
diff --git a/README.md b/README.md
index b38c67a..6c934cd 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,11 @@ Transparent background is also supported.
 
 - PHP 8.1 or later
 - Imagick PHP Extension
+
+    Check with commands:
+    ```bash
+    php -i | grep imagick
+    ```
 - Composer
 
 ## 4. Installation
@@ -545,6 +550,6 @@ You can set transparent background like this.
 
 *Document created: 2023/05/28*
 
-*Document updated: 2024/04/18*
+*Document updated: 2025/01/02*
 
-Copyright 2023 - 2024 macocci7
+Copyright 2023 - 2025 macocci7
diff --git a/bin/TestAndLint.sh b/bin/TestAndLint.sh
index 21f3585..4a3b743 100644
--- a/bin/TestAndLint.sh
+++ b/bin/TestAndLint.sh
@@ -1,12 +1,11 @@
 #!/usr/bin/bash
 
 # Script to Test and Lint
-# - for the repository: macocci7/php-boxplot
 # requirement:
-# - phpenv/phpenv
+# - https://github.com/jdx/mise installed
 # - PHP versions defined in ../PHP_VERSIONS installed
 
-CMD=phpenv
+CMD=mise
 $CMD -v &> /dev/null
 if [ $? -ne 0 ]; then
     echo "command [${CMD}] not found!"
@@ -20,46 +19,13 @@ if [ $? -ne 0 ]; then
     exit 1
 fi
 
-test_and_lint() {
+switch_version() {
     echo "==========================================================="
-    echo "[PHP $1][phpenv local $1]"
-    phpenv local $1
-    if [ $? -ne 0 ]; then
-        echo "Failed to switch version to $i. skipped."
-        return 1
-    fi
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][php -v]"
-    php -v
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][parallel-lint]"
-    ./vendor/bin/parallel-lint src tests examples
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][neon-lint]"
-    ./vendor/nette/neon/bin/neon-lint conf
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][phpcs]"
-    ./vendor/bin/phpcs --ignore=vendor \
-                       --standard=phpcs.xml \
-                       -p \
-                       -s \
-                       .
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][phpmd]"
-    ./vendor/bin/phpmd \
-                       ./src/ ./examples/ ./tests/ text \
-                       phpmd.xml
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][phpstan]"
-    ./vendor/bin/phpstan analyze -c phpstan.neon
-    echo "-----------------------------------------------------------"
-    echo "[PHP $1][phpunit]"
-    ./vendor/bin/phpunit ./tests/ \
-                         --color=auto
-    echo "-----------------------------------------------------------"
+    echo "[PHP $1][Switching PHP version to $1]"
+    mise x php@$1 -- bash bin/TestAndLintSub.sh $1;
 }
 
-echo "[[TesAndLint.sh]]"
+echo "[[TestAndLint.sh]]"
 
 SUPPORTED_PHP_VERSIONS=PHP_VERSIONS
 if [ ! -f $SUPPORTED_PHP_VERSIONS ]; then
@@ -74,6 +40,6 @@ if [ ! -r $SUPPORTED_PHP_VERSIONS ]; then
 fi
 STR_CMD=''
 while read version ; do
-    STR_CMD="$STR_CMD test_and_lint $version;"
+    STR_CMD="$STR_CMD switch_version $version;"
 done < $SUPPORTED_PHP_VERSIONS
 eval $STR_CMD
diff --git a/bin/TestAndLintSub.sh b/bin/TestAndLintSub.sh
new file mode 100644
index 0000000..28e2d19
--- /dev/null
+++ b/bin/TestAndLintSub.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/bash
+
+# Script to Test and Lint
+# requirement:
+# - PHP versions defined in ../PHP_VERSIONS installed
+
+echo "-----------------------------------------------------------"
+echo "[PHP $1][php -v]"
+php -v
+echo "-----------------------------------------------------------"
+echo "[PHP $1][parallel-lint]"
+./vendor/bin/parallel-lint src tests examples
+echo "-----------------------------------------------------------"
+echo "[PHP $1][neon-lint]"
+./vendor/nette/neon/bin/neon-lint conf
+echo "-----------------------------------------------------------"
+echo "[PHP $1][phpcs]"
+./vendor/bin/phpcs --ignore=vendor \
+                    --standard=phpcs.xml \
+                    -p \
+                    -s \
+                    .
+#echo "-----------------------------------------------------------"
+#echo "[PHP $1][phpmd]"
+#./vendor/bin/phpmd \
+#                   ./src/ ./examples/ ./tests/ text \
+#                   phpmd.xml
+echo "-----------------------------------------------------------"
+echo "[PHP $1][phpstan]"
+./vendor/bin/phpstan analyze -c phpstan.neon
+echo "-----------------------------------------------------------"
+echo "[PHP $1][phpunit]"
+./vendor/bin/phpunit ./tests/
+echo "-----------------------------------------------------------"
diff --git a/composer.json b/composer.json
index 14a7691..7440aa7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,20 +1,19 @@
 {
     "name": "macocci7/php-boxplot",
-    "version": "1.3.0",
+    "version": "1.3.1",
     "description": "it's easy to use for creating boxplots.",
     "type": "library",
     "require": {
         "php": ">=8.1",
         "macocci7/php-frequency-table": "^1.4",
-        "fakerphp/faker": "^1.23",
+        "fakerphp/faker": "^1.24",
         "nette/neon": "^3.4",
         "macocci7/php-plotter2d": "^0.3"
     },
     "require-dev": {
-        "squizlabs/php_codesniffer": "^3.7",
+        "squizlabs/php_codesniffer": "^3.11",
         "phpunit/phpunit": "^10.5",
-        "phpmd/phpmd": "^2.15",
-        "phpstan/phpstan": "^1.11",
+        "phpstan/phpstan": "^2.1",
         "php-parallel-lint/php-parallel-lint": "^1.4"
     },
     "license": "MIT",
diff --git a/examples/class/CsvUtil.php b/examples/class/CsvUtil.php
index 84397da..987fa1f 100644
--- a/examples/class/CsvUtil.php
+++ b/examples/class/CsvUtil.php
@@ -55,7 +55,7 @@ public function getDailyData($csvFileName)
         if (!file_exists($csvFileName)) {
             echo "CsvUtil::getDailyData(): '" . $csvFileName . "' does not exist.\n";
         }
-        $csv = array_map('str_getcsv', file($csvFileName));
+        $csv = array_map(fn ($fn) => str_getcsv($fn, ",", "\"", "\\"), file($csvFileName));
         $groupBy = $this->groupBy($csv, "game_date", "release_speed");
         foreach ($groupBy as $index => $row) {
             $groupBy[$index] = $this->convertString2IntegerInArray($row);
diff --git a/examples/img/AdjustDisplayByArray.png b/examples/img/AdjustDisplayByArray.png
index 3b5962c..867c6d1 100644
Binary files a/examples/img/AdjustDisplayByArray.png and b/examples/img/AdjustDisplayByArray.png differ
diff --git a/examples/img/AdjustDisplayByMethods.png b/examples/img/AdjustDisplayByMethods.png
index fc66f8b..4d7ff0d 100644
Binary files a/examples/img/AdjustDisplayByMethods.png and b/examples/img/AdjustDisplayByMethods.png differ
diff --git a/examples/img/AdjustDisplayByNeon.png b/examples/img/AdjustDisplayByNeon.png
index b6e2746..5887473 100644
Binary files a/examples/img/AdjustDisplayByNeon.png and b/examples/img/AdjustDisplayByNeon.png differ
diff --git a/examples/img/BoxplotDetmersReid2023_01.png b/examples/img/BoxplotDetmersReid2023_01.png
index 079ffde..5dfb5ea 100644
Binary files a/examples/img/BoxplotDetmersReid2023_01.png and b/examples/img/BoxplotDetmersReid2023_01.png differ
diff --git a/examples/img/BoxplotDetmersReid2023_02.png b/examples/img/BoxplotDetmersReid2023_02.png
index 962cfd5..4c4c8ec 100644
Binary files a/examples/img/BoxplotDetmersReid2023_02.png and b/examples/img/BoxplotDetmersReid2023_02.png differ
diff --git a/examples/img/BoxplotExampleCase.png b/examples/img/BoxplotExampleCase.png
index 21d8290..f096b43 100644
Binary files a/examples/img/BoxplotExampleCase.png and b/examples/img/BoxplotExampleCase.png differ
diff --git a/examples/img/MultipleDataSet.png b/examples/img/MultipleDataSet.png
index d7cb5af..4250225 100644
Binary files a/examples/img/MultipleDataSet.png and b/examples/img/MultipleDataSet.png differ
diff --git a/examples/img/TransparentBackground.png b/examples/img/TransparentBackground.png
index e4c5313..7c95ed6 100644
Binary files a/examples/img/TransparentBackground.png and b/examples/img/TransparentBackground.png differ
diff --git a/src/Analyzer.php b/src/Analyzer.php
index 6b9298d..37039a7 100644
--- a/src/Analyzer.php
+++ b/src/Analyzer.php
@@ -22,7 +22,7 @@ class Analyzer
     /**
      * @var array<string, mixed>    $parsed
      */
-    public array $parsed;
+    public array $parsed = [];
     protected int|float $limitUpper;
     protected int|float $limitLower;
     /**
@@ -150,9 +150,6 @@ public function getMean(array $data)
      */
     public function getUcl()
     {
-        if (!is_array($this->parsed)) {
-            return null;
-        }
         if (!array_key_exists('ThirdQuartile', $this->parsed)) {
             return null;
         }
@@ -168,9 +165,6 @@ public function getUcl()
      */
     public function getLcl()
     {
-        if (!is_array($this->parsed)) {
-            return null;
-        }
         if (!array_key_exists('FirstQuartile', $this->parsed)) {
             return null;
         }
@@ -186,9 +180,6 @@ public function getLcl()
      */
     public function getOutliers()
     {
-        if (!is_array($this->parsed)) {
-            return null;
-        }
         if (!array_key_exists('data', $this->parsed)) {
             return null;
         }
diff --git a/src/Helpers/Config.php b/src/Helpers/Config.php
index b376050..b2cfbc8 100644
--- a/src/Helpers/Config.php
+++ b/src/Helpers/Config.php
@@ -9,7 +9,6 @@
  * Config operator.
  * @author  macocci7 <macocci7@yahoo.co.jp>
  * @license MIT
- * @SuppressWarnings(PHPMD.ElseExpression)
  */
 class Config
 {
diff --git a/src/Plotter.php b/src/Plotter.php
index da032f8..8b873f1 100644
--- a/src/Plotter.php
+++ b/src/Plotter.php
@@ -12,9 +12,6 @@
  * class for analysis
  * @author  macocci7 <macocci7@yahoo.co.jp>
  * @license MIT
- * @SuppressWarnings(PHPMD.ExcessiveClassComplexity)
- * @SuppressWarnings(PHPMD.CyclomaticComplexity)
- * @SuppressWarnings(PHPMD.NPathComplexity)
  */
 class Plotter extends Analyzer
 {
@@ -192,10 +189,10 @@ private function adjustGridHeightPitch(float $gridHeightSpan): void
         if (!$this->gridHeightPitch) {
             $this->gridHeightPitch = 1;
             if ($this->gridHeightPitch < 0.125 * $gridHeightSpan) {
-                $this->gridHeightPitch = ( (int) (0.125 * $gridHeightSpan * 10)) / 10;
+                $this->gridHeightPitch = (int) (( (int) (0.125 * $gridHeightSpan * 10)) / 10);
             }
             if ($this->gridHeightPitch > 0.2 * $gridHeightSpan) {
-                $this->gridHeightPitch = ( (int) (0.200 * $gridHeightSpan * 10)) / 10;
+                $this->gridHeightPitch = (int) (( (int) (0.200 * $gridHeightSpan * 10)) / 10);
             }
         }
     }
@@ -211,12 +208,12 @@ private function createCanvas(): void
                 'height' => $this->canvasHeight,
             ],
             viewport: $this->viewport,
-            plotarea: $this->plotarea,
+            plotarea: $this->plotarea,  // @phpstan-ignore-line
             backgroundColor: $this->canvasBackgroundColor,
         );
         $this->transformer = new Transformer(
             viewport: $this->viewport,
-            plotarea: $this->plotarea,
+            plotarea: $this->plotarea,  // @phpstan-ignore-line
         );
     }
 
@@ -637,7 +634,7 @@ private function plotJitter(int $index, int $legend)
      */
     private function plotLabels()
     {
-        if (!is_array($this->labels)) {
+        if (empty($this->labels)) {
             return $this;
         }
         $offset = $this->plotarea['offset'];
@@ -648,8 +645,8 @@ private function plotLabels()
             if (!is_string($label) && !is_numeric($label)) {
                 continue;
             }
-            $x = (int) ($baseX + ($index + 0.5) * $gridSpanX);
-            $y = (int) ($baseY + $this->fontSize * 1.2);
+            $x = (int) round($baseX + ($index + 0.5) * $gridSpanX);
+            $y = (int) round($baseY + $this->fontSize * 1.2);
             $this->canvas->drawText(
                 text: (string) $label,
                 x: $x,
@@ -673,8 +670,8 @@ private function plotLabelX()
         $coord = $this->transformer->getCoord(0, 0);
         $offset = $this->plotarea['offset'];
         $baseY = $coord['y'] + $offset[1];
-        $x = (int) ($this->canvasWidth / 2);
-        $y = (int) ($baseY + (1 - $this->frameYRatio) * $this->canvasHeight / 3);
+        $x = (int) round($this->canvasWidth / 2);
+        $y = (int) round($baseY + (1 - $this->frameYRatio) * $this->canvasHeight / 3);
         $this->canvas->drawText(
             text: (string) $this->labelX,
             x: $x,
@@ -696,8 +693,8 @@ private function plotLabelY()
     {
         $width = $this->canvasHeight;
         $height = (int) ($this->canvasWidth * (1 - $this->frameXRatio) / 3);
-        $x = $width / 2;
-        $y = ($height + $this->fontSize) / 2;
+        $x = (int) round($width / 2);
+        $y = (int) round(($height + $this->fontSize) / 2);
         $this->canvas->drawText(
             text: (string) $this->labelY,
             x: $x,
@@ -822,9 +819,6 @@ public function create(string $filePath)
         if (strlen($filePath) === 0) {
             throw new \Exception("empty string specified for file path.");
         }
-        if (!is_array($this->dataSet)) {
-            throw new \Exception('Invalid type of property: Plotter::$data array expected.');
-        }
         if (empty($this->dataSet)) {
             throw new \Exception("Empty data specified.");
         }
diff --git a/src/Traits/AttributeTrait.php b/src/Traits/AttributeTrait.php
index d8c9a76..fcd542b 100644
--- a/src/Traits/AttributeTrait.php
+++ b/src/Traits/AttributeTrait.php
@@ -11,7 +11,7 @@ trait AttributeTrait
     /**
      * @var string[]    $labels
      */
-    protected array $labels;
+    protected array $labels = [];
     protected string $labelX;
     protected string $labelY;
     protected string $caption;