diff --git a/poetry.lock b/poetry.lock
index 31f8493..0aee6f8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -731,13 +731,13 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "prometheus-client"
-version = "0.21.0"
+version = "0.21.1"
 description = "Python client for the Prometheus monitoring system."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "prometheus_client-0.21.0-py3-none-any.whl", hash = "sha256:4fa6b4dd0ac16d58bb587c04b1caae65b8c5043e85f778f42f5f632f6af2e166"},
-    {file = "prometheus_client-0.21.0.tar.gz", hash = "sha256:96c83c606b71ff2b0a433c98889d275f51ffec6c5e267de37c7a2b5c9aa9233e"},
+    {file = "prometheus_client-0.21.1-py3-none-any.whl", hash = "sha256:594b45c410d6f4f8888940fe80b5cc2521b305a1fafe1c58609ef715a001f301"},
+    {file = "prometheus_client-0.21.1.tar.gz", hash = "sha256:252505a722ac04b0456be05c05f75f45d760c2911ffc45f2a06bcaed9f3ae3fb"},
 ]
 
 [package.extras]
@@ -947,4 +947,4 @@ zstd = ["zstandard (>=0.18.0)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "7619260e6b4c141df728fc407014825c3ba4800cf12538e74f937d6b644d5ad7"
+content-hash = "2b793d85db82bfcde3d7393ae773d3d13e57e265e55e6ab3d7ba1861b9cc2cfa"
diff --git a/pyproject.toml b/pyproject.toml
index 7870e60..4d403e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ astropy = "*"
 click = "^8.1.7"
 gcn-kafka = "^0.3.3"
 numpy = "*"
-prometheus-client = "^0.21.0"
+prometheus-client = "^0.21.1"
 python = "^3.9"
 pygcn = "^1.1.3"