diff --git a/pkgs/development/python-modules/prometheus-client/default.nix b/pkgs/development/python-modules/prometheus-client/default.nix
index 9b6653f2fa59..aacde11916e5 100644
--- a/pkgs/development/python-modules/prometheus-client/default.nix
+++ b/pkgs/development/python-modules/prometheus-client/default.nix
@@ -7,7 +7,7 @@
 
 buildPythonPackage rec {
   pname = "prometheus-client";
-  version = "0.14.1";
+  version = "0.15.0";
   format = "setuptools";
 
   disabled = pythonOlder "3.6";
@@ -15,8 +15,8 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "prometheus";
     repo = "client_python";
-    rev = "v${version}";
-    sha256 = "sha256-hvBdWOMDuzF91Hv4u//tF+z6la0JfiTQHlpS4TnWpmk=";
+    rev = "refs/tags/v${version}";
+    hash = "sha256-LabvQMNiRH4jclMnN0P4M3w25NQasNQEu1HWvRDQQ2o=";
   };
 
   checkInputs = [