diff --git a/pkgs/development/python-modules/marshmallow/default.nix b/pkgs/development/python-modules/marshmallow/default.nix
index 7b7cadc98894..4dd2ac8bcaa9 100644
--- a/pkgs/development/python-modules/marshmallow/default.nix
+++ b/pkgs/development/python-modules/marshmallow/default.nix
@@ -4,7 +4,7 @@
 
 buildPythonPackage rec {
   pname = "marshmallow";
-  version = "3.3.0";
+  version = "3.6.1";
   disabled = isPy27;
 
   meta = {
@@ -18,7 +18,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "0ba81b6da4ae69eb229b74b3c741ff13fe04fb899824377b1aff5aaa1a9fd46e";
+    sha256 = "35ee2fb188f0bd9fc1cf9ac35e45fd394bd1c153cee430745a465ea435514bd5";
   };
 
   propagatedBuildInputs = [ dateutil simplejson ];