diff --git a/pkgs/development/python-modules/prometheus_client/default.nix b/pkgs/development/python-modules/prometheus_client/default.nix
index 4529ad95175..d358bbec1da 100644
--- a/pkgs/development/python-modules/prometheus_client/default.nix
+++ b/pkgs/development/python-modules/prometheus_client/default.nix
@@ -2,11 +2,11 @@
 
 buildPythonPackage rec {
   pname = "prometheus_client";
-  version = "0.3.1";
+  version = "0.4.2";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "17bc24c09431644f7c65d7bce9f4237252308070b6395d6d8e87767afe867e24";
+    sha256 = "046cb4fffe75e55ff0e6dfd18e2ea16e54d86cc330f369bebcc683475c8b68a9";
   };
 
   doCheck = false;