diff --git a/package.json b/package.json
index a9e44fd..0aef16c 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "webpack-stream": "^7.0.0"
   },
   "dependencies": {
-    "@arction/lcjs": "^5.1.1",
+    "@arction/lcjs": "^4.1.1",
     "@arction/xydata": "^1.4.0"
   },
   "lightningChart": {
diff --git a/src/index.js b/src/index.js
index eb593f9..efa621f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,7 +10,7 @@ const { lightningChart, AxisTickStrategies, SolidFill, SolidLine, ColorRGBA, Col
 
 // Create a XY Chart.
 const chart = lightningChart().ChartXY({
-    // theme: Themes.darkGold
+    theme: Themes[new URLSearchParams(window.location.search).get('theme') || 'darkGold'] || undefined,
 }).setTitle('Daily temperature range, April 2019')
 
 const axisX = chart.getDefaultAxisX()