diff --git a/pkgs/development/python-modules/marshmallow-dataclass/default.nix b/pkgs/development/python-modules/marshmallow-dataclass/default.nix
index 730254bcf825..5d6f540f9f5f 100644
--- a/pkgs/development/python-modules/marshmallow-dataclass/default.nix
+++ b/pkgs/development/python-modules/marshmallow-dataclass/default.nix
@@ -12,7 +12,7 @@
 
 buildPythonPackage rec {
   pname = "marshmallow-dataclass";
-  version = "8.5.5";
+  version = "8.5.6";
   format = "setuptools";
 
   disabled = pythonOlder "3.6";
@@ -21,7 +21,7 @@ buildPythonPackage rec {
     owner = "lovasoa";
     repo = "marshmallow_dataclass";
     rev = "v${version}";
-    sha256 = "sha256-sozq+L3pa9iprAWtQd/L+LCfTWfDue04WzQ/fbM0mps=";
+    sha256 = "sha256-wUjgIjpN+c26yhlz3XzMOcKwTt/MDCiCLh7yGdy42jk=";
   };
 
   propagatedBuildInputs = [