diff --git a/requirements.txt b/requirements.txt
index 1785126..0a54c58 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,8 +1,11 @@
 # Core dependencies
-flask>=2.0.0
-requests>=2.28.0
-flask-limiter
-psycopg2-binary>=2.9.9
+flask>=2.0.0
+flask-limiter>=2.5.4
+requests>=2.28.0
+Werkzeug>=3.1.5
+
+# ADS-B history (optional - only needed for Postgres persistence)
+psycopg2-binary>=2.9.9
 
 # BLE scanning with manufacturer data detection (optional - for TSCM)
 bleak>=0.21.0