diff --git a/pyproject.toml b/pyproject.toml
index 60f0e23e..42c1adab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ dependencies = [
     "rich>=15.0.0",
     "redis>=8.1.0",  # Required for job queue and pub/sub
     "sse-starlette>=3.6.0",  # Server-Sent Events support
-    "prometheus-client>=0.19.0",  # Prometheus metrics
+    "prometheus-client>=0.26.0",  # Prometheus metrics
     "psutil>=7.2.2",  # System resource monitoring for sprite worker
     "Pillow>=12.3.0",  # Image processing for thumbnail uploads (security hardening)
     "bleach>=6.4.0",  # Comment sanitization
diff --git a/requirements.txt b/requirements.txt
index b5419790..aed5938e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ slowapi>=0.1.10
 rich>=15.0.0
 redis>=8.1.0
 sse-starlette>=3.6.0
-prometheus-client>=0.19.0
+prometheus-client>=0.26.0
 psutil>=7.2.2
 Pillow>=12.3.0
 bleach>=6.4.0