diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 60f101d..787f1c7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,7 +17,7 @@ jobs:
     - name: checkout
       uses: actions/checkout@v4
     - name: setup Node v${{ matrix.node-version }}
-      uses: actions/setup-node@4
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
 
diff --git a/lib/serve.js b/lib/serve.js
index cecb4bc..a899511 100644
--- a/lib/serve.js
+++ b/lib/serve.js
@@ -81,6 +81,7 @@ const serveGtfsRtViaHttp = (opt = {}) => {
 		registers: [register],
 		labelNames: ['compression'],
 	})
+	// todo: total nr of requests?
 
 	const {
 		formatTrip, formatMovement,
diff --git a/package.json b/package.json
index f87d826..349ec36 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "hafas-gtfs-rt-feed",
 	"description": "Generate a GTFS Realtime feed by monitoring a HAFAS endpoint.",
-	"version": "8.2.4",
+	"version": "8.2.5",
 	"main": "index.js",
 	"bin": {
 		"monitor-hafas": "monitor.js",
@@ -67,7 +67,7 @@
 		"normalize-vbb-station-name-for-search": "^1.0.0",
 		"p-limit": "^3.0.2",
 		"pino": "^8.11.0",
-		"prom-client": "^14.0.0",
+		"prom-client": "^15.1.0",
 		"send": "^0.18.0",
 		"serve-buffer": "^3.0.3",
 		"ttl-buffer": "^1.0.0"