diff --git a/data/qmls_old/line_simple.qml b/data/qmls_old/line_simple.qml
index 3f6eff71..abcf242f 100644
--- a/data/qmls_old/line_simple.qml
+++ b/data/qmls_old/line_simple.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/no_symbolizer.qml b/data/qmls_old/no_symbolizer.qml
index 554c0244..c6d5edc1 100644
--- a/data/qmls_old/no_symbolizer.qml
+++ b/data/qmls_old/no_symbolizer.qml
@@ -1,4 +1,4 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="nullSymbol"/>
 </qgis>
diff --git a/data/qmls_old/point_external_graphic.qml b/data/qmls_old/point_external_graphic.qml
index b5f29d82..ed67dc3b 100644
--- a/data/qmls_old/point_external_graphic.qml
+++ b/data/qmls_old/point_external_graphic.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/point_label.qml b/data/qmls_old/point_label.qml
index b2518c97..8e339b57 100644
--- a/data/qmls_old/point_label.qml
+++ b/data/qmls_old/point_label.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="nullSymbol"/>
   <labeling type="rule-based">
     <rules key="labeling_rules">
diff --git a/data/qmls_old/point_multiple_symbols.qml b/data/qmls_old/point_multiple_symbols.qml
index def659e7..4f580bbc 100644
--- a/data/qmls_old/point_multiple_symbols.qml
+++ b/data/qmls_old/point_multiple_symbols.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/point_ranges.qml b/data/qmls_old/point_ranges.qml
index f0b7bfcc..9a2bde4e 100644
--- a/data/qmls_old/point_ranges.qml
+++ b/data/qmls_old/point_ranges.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 forceraster="0" graduatedMethod="GraduatedColor" type="graduatedSymbol" attr="PlotNr" symbollevels="0" enableorderby="0">
     <ranges>
       <range symbol="0" upper="20.000000000000000" label=" 1,0000 - 20,0000 " lower="1.000000000000000" render="true"/>
diff --git a/data/qmls_old/point_rules.qml b/data/qmls_old/point_rules.qml
index 015197ee..d0535c9b 100644
--- a/data/qmls_old/point_rules.qml
+++ b/data/qmls_old/point_rules.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="Bildpositi = 1" scalemindenom="100" scalemaxdenom="2000" filter="Bildpositi = 1"/>
diff --git a/data/qmls_old/point_simple.qml b/data/qmls_old/point_simple.qml
index cdf96047..dc08a4f2 100644
--- a/data/qmls_old/point_simple.qml
+++ b/data/qmls_old/point_simple.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/polygon_simple.qml b/data/qmls_old/polygon_simple.qml
index 1522635f..bb94fd7c 100644
--- a/data/qmls_old/polygon_simple.qml
+++ b/data/qmls_old/polygon_simple.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/polygon_simple_nostyle.qml b/data/qmls_old/polygon_simple_nostyle.qml
index 1af90a75..df0c16f7 100644
--- a/data/qmls_old/polygon_simple_nostyle.qml
+++ b/data/qmls_old/polygon_simple_nostyle.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="RuleRenderer">
     <rules key="renderer_rules">
       <rule key="renderer_rule_0" symbol="0" label="QGIS Simple Symbol"/>
diff --git a/data/qmls_old/text_text_buffer.qml b/data/qmls_old/text_text_buffer.qml
index f1e57608..8cc1da9e 100644
--- a/data/qmls_old/text_text_buffer.qml
+++ b/data/qmls_old/text_text_buffer.qml
@@ -1,5 +1,5 @@
 <!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
-<qgis>
+<qgis version="3.22.16-Białowieża">
   <renderer-v2 type="nullSymbol"/>
   <labeling type="rule-based">
     <rules key="labeling_rules">
diff --git a/src/QGISStyleParser.spec.ts b/src/QGISStyleParser.spec.ts
index db76f9ef..eaf64f48 100644
--- a/src/QGISStyleParser.spec.ts
+++ b/src/QGISStyleParser.spec.ts
@@ -21,7 +21,9 @@ describe('QMLStyleParser implements StyleParser', () => {
   let styleParser: QGISStyleParser;
 
   beforeEach(() => {
-    styleParser = new QGISStyleParser();
+    styleParser = (expect.getState().currentTestName.includes('>=3.28.0'))
+      ? new QGISStyleParser()
+      : new QGISStyleParser({qgisVersion: '3.22.16-Białowieża'});
   });
 
   const QML_FOLDERS = [
@@ -120,83 +122,85 @@ describe('QMLStyleParser implements StyleParser', () => {
     });
   });
 
-  describe('#writeStyle', () => {
-    it('is defined', () => {
-      expect(styleParser.writeStyle).toBeDefined();
-    });
-    describe('PointSymbolizer', () => {
-      it('can write a simple QML PointSymbol', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/point_simple.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(point_simple);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
-      });
-      it('can write a QML PointSymbolizer with an external graphic', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/point_external_graphic.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(point_external_graphic);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
-      });
-      it('can write a QML PointSymbolizer with multiple symbols', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/point_multiple_symbols.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(point_multiple_symbols);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
-      });
-    });
-    describe('TextSymbolizer', () => {
-      it('can write some basics of the QML Labeling for Points', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/point_label.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(point_label);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+  QML_FOLDERS.forEach(qmlVersionFolder => {
+    const [qmlVersion, qmlFolder] = qmlVersionFolder;
+    describe(`#writeStyle ${qmlVersion}`, () => {
+      it('is defined', () => {
+        expect(styleParser.writeStyle).toBeDefined();
       });
-      it('can write QML with text-buffer', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/text_text_buffer.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(text_text_buffer);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+      describe('PointSymbolizer', () => {
+        it('can write a simple QML PointSymbol', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/point_simple.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(point_simple);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
+        it('can write a QML PointSymbolizer with an external graphic', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/point_external_graphic.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(point_external_graphic);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
+        it('can write a QML PointSymbolizer with multiple symbols', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/point_multiple_symbols.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(point_multiple_symbols);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
       });
-    });
-    describe('LineSymbolizer', () => {
-      it('can write a simple QML LineSymbol', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/line_simple.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(line_simple);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+      describe('TextSymbolizer', () => {
+        it('can write some basics of the QML Labeling for Points', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/point_label.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(point_label);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
+        it('can write QML with text-buffer', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/text_text_buffer.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(text_text_buffer);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
       });
-    });
-    describe('FillSymbolizer', () => {
-      it('can write a simple QML FillSymbol', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/polygon_simple.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(polygon_simple);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+      describe('LineSymbolizer', () => {
+        it('can write a simple QML LineSymbol', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/line_simple.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(line_simple);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
       });
-    });
-    describe('Filter Parsing', () => {
-      it('can write a rule based QML PointSymbolizer', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/point_rules.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(point_rules);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+      describe('FillSymbolizer', () => {
+        it('can write a simple QML FillSymbol', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/polygon_simple.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(polygon_simple);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
       });
-      it('can write QML with no symbolizers', async () => {
-        expect.assertions(2);
-        const qml = fs.readFileSync('./data/qmls/no_symbolizer.qml', 'utf8');
-        const { output: qgisStyle } = await styleParser.writeStyle(no_symbolizer);
-        expect(qgisStyle).toBeDefined();
-        expect(qgisStyle).toEqual(qml.trim());
+      describe('Filter Parsing', () => {
+        it('can write a rule based QML PointSymbolizer', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/point_rules.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(point_rules);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
+        it('can write QML with no symbolizers', async () => {
+          expect.assertions(2);
+          const qml = fs.readFileSync(`./data/${qmlFolder}/no_symbolizer.qml`, 'utf8');
+          const { output: qgisStyle } = await styleParser.writeStyle(no_symbolizer);
+          expect(qgisStyle).toBeDefined();
+          expect(qgisStyle).toEqual(qml.trim());
+        });
       });
     });
   });
-
 });
diff --git a/src/QGISStyleParser.ts b/src/QGISStyleParser.ts
index 807caaf0..4efc2847 100644
--- a/src/QGISStyleParser.ts
+++ b/src/QGISStyleParser.ts
@@ -24,8 +24,6 @@ import {
   Builder
 } from 'xml2js';
 
-const OUTPUT_VERSION = '3.28.0-Firenze';
-
 const get = (obj: any, path: any, defaultValue = undefined) => {
   const travel = (regexp: RegExp) =>
     String.prototype.split
@@ -36,6 +34,10 @@ const get = (obj: any, path: any, defaultValue = undefined) => {
   return result === undefined || result === obj ? defaultValue : result;
 };
 
+export type ConstructorParams = {
+  qgisVersion?: string;
+};
+
 type SymbolizerMap = {
   [key: string]: Symbolizer[];
 };
@@ -130,6 +132,27 @@ export class QGISStyleParser implements StyleParser {
 
   title = 'QGIS Style Parser';
 
+  qgisVersion: string;
+
+  // QGIS 3.28 and later use <Option> instead of <prop> to serialize individual properties.
+  writePropsAsOptions: boolean;
+
+  constructor(opts: ConstructorParams = {}) {
+    this.qgisVersion = opts.qgisVersion ?? '3.28.0-Firenze';
+    this.writePropsAsOptions = this.compareVersions('3.28.0-Firenze', this.qgisVersion) >= 0;
+  }
+
+  compareVersions(version1: string, version2: string): number {
+    try {
+      const parseVersion = (version: string) => version.split('-')[0].split('.').map(Number);
+      const [major1, minor1, patch1] = parseVersion(version1);
+      const [major2, minor2, patch2] = parseVersion(version2);
+      return Math.sign(major2 - major1) || Math.sign(minor2 - minor1) || Math.sign(patch2 - patch1);
+    } catch (error) {
+      return 0;
+    }
+  }
+
   /**
    * The readStyle implementation of the GeoStyler-Style StyleParser interface.
    * It reads a QML as a string and returns a Promise containing the
@@ -837,7 +860,7 @@ export class QGISStyleParser implements StyleParser {
       $: {
         class: 'SimpleLine'
       },
-      Option: this.propsObjectToQmlSymbolOptions(qmlProps)
+      ...this.propsObjectToQmlSymbolOptions(qmlProps)
     };
   }
 
@@ -869,7 +892,7 @@ export class QGISStyleParser implements StyleParser {
       $: {
         class: 'SimpleFill'
       },
-      Option: this.propsObjectToQmlSymbolOptions(qmlProps)
+      ...this.propsObjectToQmlSymbolOptions(qmlProps)
     };
   }
 
@@ -919,7 +942,7 @@ export class QGISStyleParser implements StyleParser {
       $: {
         class: 'SvgMarker'
       },
-      Option: this.propsObjectToQmlSymbolOptions(qmlProps)
+      ...this.propsObjectToQmlSymbolOptions(qmlProps)
     };
   }
 
@@ -957,15 +980,21 @@ export class QGISStyleParser implements StyleParser {
       $: {
         class: 'SimpleMarker'
       },
-      Option: this.propsObjectToQmlSymbolOptions(qmlProps)
+      ...this.propsObjectToQmlSymbolOptions(qmlProps)
     };
   }
 
   /**
-   *
-   * @param properties
+   * @param {object} properties Object containing key-value pairs to serialize as QML.
+   * @return an XML object representing either <Option type="map"><repeated Option /></Option> or <repeated prop... />
    */
-  propsObjectToQmlSymbolOptions(properties: any): QmlMapOption {
+  propsObjectToQmlSymbolOptions(properties: any): {Option: QmlMapOption} | {prop: QmlProp[]} {
+    return this.writePropsAsOptions
+      ? this.propsObjectToQmlSymbol_NewerOptions(properties)
+      : this.propsObjectToQmlSymbol_OlderProps(properties);
+  }
+
+  propsObjectToQmlSymbol_NewerOptions(properties: any): {Option: QmlMapOption} {
     const options = Object.keys(properties).map(k => {
       const v = properties[k];
       return {
@@ -977,13 +1006,28 @@ export class QGISStyleParser implements StyleParser {
       };
     }).filter(o => o.$.value !== undefined);
     return {
-      $: {
-        type: 'Map'
-      },
-      Option: options
+      Option: {
+        $: {
+          type: 'Map'
+        },
+        Option: options
+      }
     };
   }
 
+  propsObjectToQmlSymbol_OlderProps(properties: any): {prop: QmlProp[]} {
+    const props = Object.keys(properties).map(k => {
+      const v = properties[k];
+      return {
+        $: {
+          k: k,
+          v: v,
+        }
+      };
+    }).filter(p => p.$.v !== undefined);
+    return {prop: props};
+  }
+
   /**
    * Get the QML Object (readable with xml2js) from an GeoStyler-Style Style
    *
@@ -998,7 +1042,7 @@ export class QGISStyleParser implements StyleParser {
       return {
         qgis: {
           $: {
-            version: OUTPUT_VERSION
+            version: this.qgisVersion
           },
           'renderer-v2': [{
             $: {
@@ -1020,7 +1064,7 @@ export class QGISStyleParser implements StyleParser {
       return {
         qgis: {
           $: {
-            version: OUTPUT_VERSION
+            version: this.qgisVersion
           },
           'renderer-v2': [{
             $: {