diff --git a/prometheus.yml b/prometheus.yml
index 0171973..1245631 100644
--- a/prometheus.yml
+++ b/prometheus.yml
@@ -7,7 +7,7 @@ scrape_configs:
     metrics_path: /monitoring/metrics
     # Add the api key to the GET params.
     params:
-      api_key: ['']
+      api_key: ['TRACKING_SERVICE_API_KEY']
     static_configs:
       - targets: ['tracking-service:8000']
   - job_name: 'predictor-nginx'
@@ -32,6 +32,6 @@ scrape_configs:
     metrics_path: /crashReports/metrics
     # Add the api key to the GET params.
     params:
-      api_key: ['']
+      api_key: ['BIKER_SWARM_MONITOR_API_KEY']
     static_configs:
       - targets: ['biker-swarm-monitor:8000']
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