diff --git a/pkgs/development/python-modules/marshmallow/default.nix b/pkgs/development/python-modules/marshmallow/default.nix
index 5fcaf478f186..bbe9c9bf157d 100644
--- a/pkgs/development/python-modules/marshmallow/default.nix
+++ b/pkgs/development/python-modules/marshmallow/default.nix
@@ -10,16 +10,16 @@
 
 buildPythonPackage rec {
   pname = "marshmallow";
-  version = "3.19.0";
+  version = "3.20.1";
   format = "setuptools";
 
-  disabled = pythonOlder "3.6";
+  disabled = pythonOlder "3.8";
 
   src = fetchFromGitHub {
     owner = "marshmallow-code";
     repo = pname;
-    rev = version;
-    hash = "sha256-b1brLHM48t45bwUXk7QreLLmvTzU0sX7Uoc1ZAgGkrE=";
+    rev = "refs/tags/${version}";
+    hash = "sha256-sPYiup7ontnubtBxv+rIT0up4IHPJNCUlH9J4FlHsss=";
   };
 
   propagatedBuildInputs = [
@@ -37,9 +37,9 @@ buildPythonPackage rec {
   ];
 
   meta = with lib; {
-    changelog = "https://github.com/marshmallow-code/marshmallow/blob/${src.rev}/CHANGELOG.rst";
     description = "Library for converting complex objects to and from simple Python datatypes";
     homepage = "https://github.com/marshmallow-code/marshmallow";
+    changelog = "https://github.com/marshmallow-code/marshmallow/blob/${version}/CHANGELOG.rst";
     license = licenses.mit;
     maintainers = with maintainers; [ cript0nauta ];
   };