diff --git a/packages/react/src/App.tsx b/packages/react/src/App.tsx
index ea1bf5f..85bcf70 100644
--- a/packages/react/src/App.tsx
+++ b/packages/react/src/App.tsx
@@ -29,11 +29,11 @@ import React, {
 } from "react";
 
 function buildThresholdList() {
-  let thresholds = [];
-  let numSteps = 20;
+  const thresholds: number[] = [];
+  const numSteps = 20;
 
   for (let i = 1.0; i <= numSteps; i++) {
-    let ratio = i / numSteps;
+    const ratio = i / numSteps;
     thresholds.push(ratio);
   }