diff --git a/pkgs/development/python-modules/black/default.nix b/pkgs/development/python-modules/black/default.nix
index 6ad124e8fd4..7abc18d383e 100644
--- a/pkgs/development/python-modules/black/default.nix
+++ b/pkgs/development/python-modules/black/default.nix
@@ -4,13 +4,13 @@
 
 buildPythonPackage rec {
   pname = "black";
-  version = "18.9b0";
+  version = "19.3b0";
 
   disabled = pythonOlder "3.6";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1992ramdwv8sg4mbl5ajirwj5i4a48zjgsycib0fnbaliyiajc70";
+    sha256 = "073kd5rs02lisp6n3h7yai9lix520xnaa6c7rdmp2sci9pyhz5b8";
   };
 
   checkInputs =  [ pytest glibcLocales ];