Index: applications/editors/josm/plugins/wms-turbo-challenge2/build.xml
===================================================================
--- applications/editors/josm/plugins/wms-turbo-challenge2/build.xml	(revision 35938)
+++ applications/editors/josm/plugins/wms-turbo-challenge2/build.xml	(revision 35939)
@@ -5,5 +5,5 @@
     <property name="commit.message" value="Commit message"/>
     <!-- enter the *lowest* JOSM version this plugin is currently compatible with -->
-    <property name="plugin.main.version" value="14153"/>
+    <property name="plugin.main.version" value="15496"/>
 
     <property name="plugin.author" value="Andrzej Zaborowski"/>
Index: applications/editors/josm/plugins/wms-turbo-challenge2/src/wmsturbochallenge/GameWindow.java
===================================================================
--- applications/editors/josm/plugins/wms-turbo-challenge2/src/wmsturbochallenge/GameWindow.java	(revision 35938)
+++ applications/editors/josm/plugins/wms-turbo-challenge2/src/wmsturbochallenge/GameWindow.java	(revision 35939)
@@ -30,5 +30,5 @@
 import org.openstreetmap.josm.data.coor.EastNorth;
 import org.openstreetmap.josm.data.gpx.GpxData;
-import org.openstreetmap.josm.data.gpx.ImmutableGpxTrack;
+import org.openstreetmap.josm.data.gpx.GpxTrack;
 import org.openstreetmap.josm.data.gpx.WayPoint;
 import org.openstreetmap.josm.data.projection.ProjectionRegistry;
@@ -133,6 +133,5 @@
 
             GpxData data = new GpxData();
-            data.tracks.add(new ImmutableGpxTrack(trackSegs,
-                    new HashMap<String, Object>()));
+            data.tracks.add(new GpxTrack(trackSegs, new HashMap<>()));
 
             ground_view.parent.getLayerManager().addLayer(