diff --git a/README.md b/README.md
index a6ffe4c..c309392 100644
--- a/README.md
+++ b/README.md
@@ -11,12 +11,13 @@ For a sample application demonstrating how to use LaunchDarkly in *client-side*
 ## Build instructions
 
 1. Install the LaunchDarkly Node.js SDK by running `npm install`
-2. Edit `index.ts` and set the value of `sdkKey` to your LaunchDarkly SDK key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set `featureFlagKey` to the flag key.
+2. Set the environment variable `LAUNCHDARKLY_SDK_KEY` to your LaunchDarkly SDK key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, set `LAUNCHDARKLY_FLAG_KEY` to the flag key; otherwise, a boolean flag of `sample-feature` will be assumed.
 
-```js
-  const sdkKey = "1234567890abcdef";
-
-  const featureFlagKey = "my-flag";
+```bash
+  export LAUNCHDARKLY_SDK_KEY="1234567890abcdef"
+  export LAUNCHDARKLY_FLAG_KEY="my-boolean-flag"
 ```
 
 3. Run `npm start`
+
+You should receive the message "The <flagKey> feature flag evaluates to <flagValue>.". The application will run continuously and react to flag changes in LaunchDarkly.
diff --git a/package.json b/package.json
index 1c8fdf3..cff05ab 100644
--- a/package.json
+++ b/package.json
@@ -9,9 +9,9 @@
   "author": "LaunchDarkly <team@launchdarkly.com>",
   "license": "Apache-2.0",
   "devDependencies": {
-    "@types/node": "22.10.1",
+    "@types/node": "22.20.1",
     "ts-node": "10.9.2",
-    "typescript": "5.7.2"
+    "typescript": "5.9.3"
   },
   "dependencies": {
     "@launchdarkly/node-server-sdk": ">= 9.0.0"