diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7d221bd..a40c0e2f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Added
 
-- Nothing
+- Add point size option for scatter charts
 
 ### Changed
 
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 0e2ede6f..2f679a84 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -4957,7 +4957,7 @@ parameters:
 
 		-
 			message: "#^Parameter \\#2 \\$value of method XMLWriter\\:\\:writeAttribute\\(\\) expects string, int given\\.$#"
-			count: 45
+			count: 44
 			path: src/PhpSpreadsheet/Writer/Xlsx/Chart.php
 
 		-
diff --git a/src/PhpSpreadsheet/Chart/DataSeriesValues.php b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
index 88063336..745f0106 100644
--- a/src/PhpSpreadsheet/Chart/DataSeriesValues.php
+++ b/src/PhpSpreadsheet/Chart/DataSeriesValues.php
@@ -45,6 +45,13 @@ class DataSeriesValues
      */
     private $pointMarker;
 
+    /**
+     * Series Point Size.
+     *
+     * @var int
+     */
+    private $pointSize = 3;
+
     /**
      * Point Count (The number of datapoints in the dataseries).
      *
@@ -175,6 +182,26 @@ class DataSeriesValues
         return $this;
     }
 
+    /**
+     * Get Point Size.
+     */
+    public function getPointSize(): int
+    {
+        return $this->pointSize;
+    }
+
+    /**
+     * Set Point Size.
+     *
+     * @return $this
+     */
+    public function setPointSize(int $size = 3)
+    {
+        $this->pointSize = $size;
+
+        return $this;
+    }
+
     /**
      * Get Series Format Code.
      *
diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
index 23b78a2f..ba7a6545 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Chart.php
@@ -1140,7 +1140,7 @@ class Chart extends WriterPart
 
                     if ($plotSeriesMarker !== 'none') {
                         $objWriter->startElement('c:size');
-                        $objWriter->writeAttribute('val', 3);
+                        $objWriter->writeAttribute('val', (string) $plotSeriesValues->getPointSize());
                         $objWriter->endElement();
                     }