diff --git a/pkgs/development/python-modules/karton-dashboard/default.nix b/pkgs/development/python-modules/karton-dashboard/default.nix
index 08eeed7141ae..5b67123ee278 100644
--- a/pkgs/development/python-modules/karton-dashboard/default.nix
+++ b/pkgs/development/python-modules/karton-dashboard/default.nix
@@ -5,6 +5,7 @@
 , karton-core
 , mistune
 , prometheus-client
+, pythonOlder
 }:
 
 buildPythonPackage rec {
@@ -12,6 +13,8 @@ buildPythonPackage rec {
   version = "1.2.1";
   format = "setuptools";
 
+  disabled = pythonOlder "3.7";
+
   src = fetchFromGitHub {
     owner = "CERT-Polska";
     repo = pname;
@@ -29,7 +32,7 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace requirements.txt \
       --replace "Flask==1.1.1" "Flask" \
-      --replace "prometheus-client==0.10.0" "prometheus-client"
+      --replace "prometheus_client==0.11.0" "prometheus_client"
   '';
 
   # Project has no tests. pythonImportsCheck requires MinIO configuration
diff --git a/pkgs/development/python-modules/prometheus-client/default.nix b/pkgs/development/python-modules/prometheus-client/default.nix
index 6c7cede280cf..7af4e2b02faa 100644
--- a/pkgs/development/python-modules/prometheus-client/default.nix
+++ b/pkgs/development/python-modules/prometheus-client/default.nix
@@ -2,11 +2,15 @@
 , buildPythonPackage
 , fetchFromGitHub
 , pytestCheckHook
+, pythonOlder
 }:
 
 buildPythonPackage rec {
   pname = "prometheus-client";
   version = "0.12.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "prometheus";
@@ -19,11 +23,14 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  pythonImportsCheck = [ "prometheus_client" ];
+  pythonImportsCheck = [
+    "prometheus_client"
+  ];
 
   meta = with lib; {
     description = "Prometheus instrumentation library for Python applications";
     homepage = "https://github.com/prometheus/client_python";
     license = licenses.asl20;
+    maintainers = with maintainers; [ ];
   };
 }