diff --git a/poetry.lock b/poetry.lock
index a3c85bd..c0243ce 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -794,13 +794,13 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "prometheus-client"
-version = "0.20.0"
+version = "0.21.0"
 description = "Python client for the Prometheus monitoring system."
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "prometheus_client-0.20.0-py3-none-any.whl", hash = "sha256:cde524a85bce83ca359cc837f28b8c0db5cac7aa653a588fd7e84ba061c329e7"},
-    {file = "prometheus_client-0.20.0.tar.gz", hash = "sha256:287629d00b147a32dcb2be0b9df905da599b2d82f80377083ec8463309a4bb89"},
+    {file = "prometheus_client-0.21.0-py3-none-any.whl", hash = "sha256:4fa6b4dd0ac16d58bb587c04b1caae65b8c5043e85f778f42f5f632f6af2e166"},
+    {file = "prometheus_client-0.21.0.tar.gz", hash = "sha256:96c83c606b71ff2b0a433c98889d275f51ffec6c5e267de37c7a2b5c9aa9233e"},
 ]
 
 [package.extras]
@@ -1618,4 +1618,4 @@ test = ["big-O", "jaraco.functools", "jaraco.itertools", "jaraco.test", "more-it
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "050a3f980170c84276d0e218b0f1f8252212f756c47b8d3068a276b1f62d9542"
+content-hash = "d2fc110334f4411bbb8601fe19ddabbf678f232a94d88cc92e21b5d949bfbf6a"
diff --git a/pyproject.toml b/pyproject.toml
index 7bf11b6..b8a65be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ start = "gh_actions_exporter.main:start"
 [tool.poetry.dependencies]
 python = "^3.9"
 fastapi = "^0.115.2"
-prometheus-client = "^0.20.0"
+prometheus-client = "^0.21.0"
 uvicorn = { extras = ["standard"], version = "^0.32.0" }
 python-multipart = "^0.0.12"
 PyYAML = "^6.0"