diff --git a/WP-GPX-Maps.js b/WP-GPX-Maps.js
index 7bdb924..eb21138 100644
--- a/WP-GPX-Maps.js
+++ b/WP-GPX-Maps.js
@@ -2,7 +2,7 @@
 Plugin Name: WP-GPX-Maps
 Plugin URI: http://www.devfarm.it/
 Description: Draws a gpx track with altitude graph
-Version: 1.3.14
+Version: 1.3.15
 Author: Bastianon Massimo
 Author URI: http://www.pedemontanadelgrappa.it/
 */
@@ -188,7 +188,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 			
 		map.mapTypes.set("OSM1", new google.maps.ImageMapType({
 			getTileUrl: function(coord, zoom) {
-				return "http://tile.openstreetmap.org/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
+				return "https://tile.openstreetmap.org/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
 			},
 			tileSize: new google.maps.Size(256, 256),
 			name: "OSM",
@@ -199,7 +199,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 		map.mapTypes.set("OSM2", new google.maps.ImageMapType({
 			getTileUrl: function(coord, zoom) {
 				if (hasThunderforestApiKey)
-					return "http://a.tile.thunderforest.com/cycle/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
+					return "https://a.tile.thunderforest.com/cycle/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
 				else
 					return "http://a.tile.opencyclemap.org/cycle/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
 			},
@@ -212,7 +212,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 		map.mapTypes.set("OSM4", new google.maps.ImageMapType({
 			getTileUrl: function(coord, zoom) {
 				if (hasThunderforestApiKey)
-					return "http://a.tile.thunderforest.com/transport/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
+					return "https://a.tile.thunderforest.com/transport/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
 				else
 					return "http://a.tile2.opencyclemap.org/transport/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
 			},
@@ -225,7 +225,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 		map.mapTypes.set("OSM5", new google.maps.ImageMapType({
 			getTileUrl: function(coord, zoom) {
 				if (hasThunderforestApiKey)
-					return "http://a.tile.thunderforest.com/landscape/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
+					return "https://a.tile.thunderforest.com/landscape/" + zoom + "/" + coord.x + "/" + coord.y + ".png?apikey=" + ThunderforestApiKey;
 				else
 					return "http://a.tile3.opencyclemap.org/landscape/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
 			},
@@ -237,7 +237,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 		
 		map.mapTypes.set("OSM6", new google.maps.ImageMapType({
 			getTileUrl: function(coord, zoom) {
-				return "http://tile2.maptoolkit.net/terrain/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
+				return "https://tile2.maptoolkit.net/terrain/" + zoom + "/" + coord.x + "/" + coord.y + ".png";
 			},
 			tileSize: new google.maps.Size(256, 256),
 			name: "MTK-Terr",
@@ -362,12 +362,12 @@ Author URI: http://www.pedemontanadelgrappa.it/
 		if (!jQuery.isEmptyObject(waypoints))
 		{
 
-			var image = new google.maps.MarkerImage('http://maps.google.com/mapfiles/ms/micons/flag.png',
+			var image = new google.maps.MarkerImage('https://maps.google.com/mapfiles/ms/micons/flag.png',
 				new google.maps.Size(32, 32),
 				new google.maps.Point(0,0),
 				new google.maps.Point(16, 32)
 			);
-			var shadow = new google.maps.MarkerImage('http://maps.google.com/mapfiles/ms/micons/flag.shadow.png',
+			var shadow = new google.maps.MarkerImage('https://maps.google.com/mapfiles/ms/micons/flag.shadow.png',
 				new google.maps.Size(59, 32),
 				new google.maps.Point(0,0),
 				new google.maps.Point(16, 32)
@@ -613,7 +613,7 @@ Author URI: http://www.pedemontanadelgrappa.it/
 			
 			if (currentIcon == '')
 			{
-				currentIcon = "http://maps.google.com/mapfiles/kml/pal4/icon25.png";
+				currentIcon = "https://maps.google.com/mapfiles/kml/pal4/icon25.png";
 			}
 			
 			var current = new google.maps.MarkerImage(currentIcon,
diff --git a/readme.txt b/readme.txt
index a2a7e53..41f6785 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,8 +4,8 @@ Contributors: bastianonm, Stephan Klein, Michel Selerin
 Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=8VHWLRW6JBTML
 Tags: maps, gpx, gps, graph, chart, google maps, track, garmin, image, nextgen-gallery, nextgen, exif, OpenStreetMap, OpenCycleMap, Hike&Bike, heart rate, heartrate, cadence
 Requires at least: 2.0.0
-Tested up to: 4.7.2
-Stable tag: 1.3.14
+Tested up to: 4.8
+Stable tag: 1.3.15
 
 Draws a gpx track with altitude graph. You can also display your nextgen gallery images in the map.
 
@@ -154,8 +154,10 @@ Yes!
 1. Altitude & Speed & Hearth rate
 
 == Changelog ==
+= 1.3.15 =
+* Switched to HTTPS where possible (thanks to delitestudio)
 = 1.3.14 =
-* Added Thunderforest Api Key on settings (OpenCycleMap)
+* Added Thunderforest Api Key on settings: for OpenCycleMap
 = 1.3.13 =
 * Added google maps api key on settings
 * Removed parameter 'sensor' on google maps js
diff --git a/wp-gpx-maps.php b/wp-gpx-maps.php
index c3fad5d..bc96aa5 100644
--- a/wp-gpx-maps.php
+++ b/wp-gpx-maps.php
@@ -3,7 +3,7 @@
 Plugin Name: WP-GPX-Maps
 Plugin URI: http://www.devfarm.it/
 Description: Draws a GPX track with altitude chart
-Version: 1.3.14
+Version: 1.3.15
 Author: Bastianon Massimo
 Author URI: http://www.pedemontanadelgrappa.it/
 */
@@ -51,7 +51,7 @@ function enqueue_WP_GPX_Maps_scripts()
 	wp_enqueue_script( 'jquery' );	if ($wpgpxmaps_googlemapsv3_apikey)	{		wp_enqueue_script( 'googlemaps', '//maps.googleapis.com/maps/api/js?key='.$wpgpxmaps_googlemapsv3_apikey, null, null);					}	else	{		wp_enqueue_script( 'googlemaps', '//maps.googleapis.com/maps/api/js', null, null);			}	
 
     wp_enqueue_script( 'highcharts', "//code.highcharts.com/3.0.10/highcharts.js", array('jquery'), "3.0.10", true);
-    wp_enqueue_script( 'WP-GPX-Maps', plugins_url('/WP-GPX-Maps.js', __FILE__), array('jquery','googlemaps','highcharts'), "1.3.14");
+    wp_enqueue_script( 'WP-GPX-Maps', plugins_url('/WP-GPX-Maps.js', __FILE__), array('jquery','googlemaps','highcharts'), "1.3.15");
 }
 
 function print_WP_GPX_Maps_styles()