diff --git a/requirements.txt b/requirements.txt
index 21b2382..76950fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 fastmcp>=2.0.0,<3.0.0
 python-dotenv>=1.1.0,<2.0.0
 rich>=13.9.0,<14.0.0
-limits>=3.0.0,<4.0.0  # Rate limiting for security
+limits>=3.0.0,<6.0.0  # Rate limiting for security
 structlog>=24.0.0,<25.0.0  # Structured logging
 prometheus-client>=0.20.0,<1.0.0  # Metrics collection