diff --git a/pkgs/development/python-modules/prometheus-api-client/default.nix b/pkgs/development/python-modules/prometheus-api-client/default.nix
index affb5a2971fc..93cf3ed6f1b3 100644
--- a/pkgs/development/python-modules/prometheus-api-client/default.nix
+++ b/pkgs/development/python-modules/prometheus-api-client/default.nix
@@ -13,14 +13,14 @@
 
 buildPythonPackage rec {
   pname = "prometheus-api-client";
-  version = "0.5.5";
+  version = "0.5.6";
   format = "setuptools";
 
   src = fetchFromGitHub {
     owner = "4n4nd";
     repo = "prometheus-api-client-python";
     tag = "v${version}";
-    hash = "sha256-tUu0+ZUOFxBCj//lHhNm88rhFbS01j1x508+nqIkCfQ=";
+    hash = "sha256-0vnG0m+RV2Z9GIMJ/R0edjcjyPH1OvB8zERCMeyRuRg=";
   };
 
   propagatedBuildInputs = [
@@ -47,7 +47,7 @@ buildPythonPackage rec {
       and performing various aggregation operations on the time series data.
     '';
     homepage = "https://github.com/4n4nd/prometheus-api-client-python";
-    changelog = "https://github.com/4n4nd/prometheus-api-client-python/blob/${src.rev}/CHANGELOG.md";
+    changelog = "https://github.com/4n4nd/prometheus-api-client-python/blob/${src.tag}/CHANGELOG.md";
     license = licenses.mit;
     maintainers = with maintainers; [ azahi ];
   };