diff --git a/requirements.txt b/requirements.txt
index 44f23e0..0be6149 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,13 +1,11 @@
+# Core
 flask>=3.0
 
 # Security & Rate Limiting
 flask-limiter>=3.5
-flask-cors>=4.0
 
-# Observability
+# Observability (optional, for /metrics endpoint)
 prometheus-flask-exporter>=0.23
 
-# Development/Testing
-pytest>=8.0
-pytest-cov>=4.0
-locust>=2.20
+# PKI support (optional)
+cryptography>=42.0