diff --git a/package.json b/package.json
index 5b642a7..dd20385 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 177099c..b840ab0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -63,7 +63,7 @@ const probabilityDistribution = (mean, variance) => (x) =>
 // Make chart with series graphing standard probability density and cumulative distribution functions.
 const chart = lightningChart()
     .ChartXY({
-        // theme: Themes.darkGold
+        theme: Themes[new URLSearchParams(window.location.search).get('theme') || 'darkGold'] || undefined,
     })
     .setTitle('Probability distribution + Simulated accumulation and BoxSeries')
     // Set auto-cursor mode to 'onHover'