diff --git a/pkgs/development/python-modules/ujson/default.nix b/pkgs/development/python-modules/ujson/default.nix
index 4d12af0689d8..0d7faf93f934 100644
--- a/pkgs/development/python-modules/ujson/default.nix
+++ b/pkgs/development/python-modules/ujson/default.nix
@@ -9,12 +9,12 @@
 
 buildPythonPackage rec {
   pname = "ujson";
-  version = "4.3.0";
+  version = "5.1.0";
   disabled = isPyPy || pythonOlder "3.5";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "baee56eca35cb5fbe02c28bd9c0936be41a96fa5c0812d9d4b7edeb5c3d568a0";
+    sha256 = "a88944d2f99db71a3ca0c63d81f37e55b660edde0b07216fb65a3e46403ef004";
   };
 
   nativeBuildInputs = [