diff --git a/pyproject.toml b/pyproject.toml
index 250115d89..3ff6ec2cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -71,7 +71,7 @@ dependencies = [
     "langchain-google-genai>=3.0.0",  # Google Gemini embeddings (API-based, no model hosting)
     # Monitoring
     "prometheus-api-client>=0.5.5",  # For querying Prometheus metrics in SLA monitoring
-    "prometheus-client>=0.20.0",  # For exporting Prometheus metrics
+    "prometheus-client>=0.25.0",  # For exporting Prometheus metrics
     # Resilience Patterns (ADR-0026)
     "pybreaker>=1.0.0",  # Circuit breaker pattern for preventing cascade failures
     "tenacity>=9.1.2",  # Retry logic with exponential backoff