diff --git a/pkgs/development/python-modules/prometheus-client/default.nix b/pkgs/development/python-modules/prometheus-client/default.nix
index 4c4c2338445a8..a9252ea945a6b 100644
--- a/pkgs/development/python-modules/prometheus-client/default.nix
+++ b/pkgs/development/python-modules/prometheus-client/default.nix
@@ -3,24 +3,29 @@
 , fetchFromGitHub
 , pytestCheckHook
 , pythonOlder
+, setuptools
 }:
 
 buildPythonPackage rec {
   pname = "prometheus-client";
-  version = "0.19.0";
-  format = "setuptools";
+  version = "0.20.0";
+  pyproject = true;
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.8";
 
   src = fetchFromGitHub {
     owner = "prometheus";
     repo = "client_python";
     rev = "refs/tags/v${version}";
-    hash = "sha256-7mVqfzK0E8RQAlQyQD8/DIcPJZ52V13JqU22tsQJp+Q=";
+    hash = "sha256-IMw0mpOUzjXBy4bMTeSFMc5pdibI5lGxZHKiufjPLbM=";
   };
 
   __darwinAllowLocalNetworking = true;
 
+  nativeBuildInputs = [
+    setuptools
+  ];
+
   nativeCheckInputs = [
     pytestCheckHook
   ];