diff --git a/setup.py b/setup.py
index 5a73eca..2c2bbb2 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
     "blessed<1.21",
     "boto3<1.35",
     "crate==0.35.2",
-    "prometheus-client<0.11",
+    "prometheus-client<0.21",
     "urllib3<3",
     "datetime-truncate<2",
     "psycopg2-binary<2.10",