diff --git a/pkgs/development/python-modules/flask-marshmallow/default.nix b/pkgs/development/python-modules/flask-marshmallow/default.nix
index bd28280a47a..6ef3291af6c 100644
--- a/pkgs/development/python-modules/flask-marshmallow/default.nix
+++ b/pkgs/development/python-modules/flask-marshmallow/default.nix
@@ -4,7 +4,7 @@
 
 buildPythonPackage rec {
   pname = "flask-marshmallow";
-  version = "0.12.0";
+  version = "0.13.0";
 
   meta = {
     homepage = "https://github.com/marshmallow-code/flask-marshmallow";
@@ -14,7 +14,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "6e6aec171b8e092e0eafaf035ff5b8637bf3a58ab46f568c4c1bab02f2a3c196";
+    sha256 = "aefc1f1d96256c430a409f08241bab75ffe97e5d14ac5d1f000764e39bf4873a";
   };
 
   propagatedBuildInputs = [ flask marshmallow ];