diff --git a/package.json b/package.json
index 68084ea..9dde8e0 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 e5c573d..901bfb9 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,7 +10,7 @@ const { lightningChart, AxisTickStrategies, Themes } = lcjs
 // Create a XY Chart.
 const chart = lightningChart()
     .ChartXY({
-        // theme: Themes.darkGold
+        theme: Themes[new URLSearchParams(window.location.search).get('theme') || 'darkGold'] || undefined,
     })
     .setPadding({
         right: 50,