diff --git a/pkgs/development/python-modules/uvloop/default.nix b/pkgs/development/python-modules/uvloop/default.nix
index f5d0e08cbb28..6058d62c0640 100644
--- a/pkgs/development/python-modules/uvloop/default.nix
+++ b/pkgs/development/python-modules/uvloop/default.nix
@@ -6,7 +6,7 @@
   fetchPypi,
 
   # build-system
-  cython_0,
+  cython,
   setuptools,
 
   # native dependencies
@@ -22,18 +22,18 @@
 
 buildPythonPackage rec {
   pname = "uvloop";
-  version = "0.20.0";
+  version = "0.21.0";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-RgPKcUp1T8jZsZfjJdslsuoEU4Xoo60F00Y95yX99Gk=";
+    hash = "sha256-O/ErD9poRHgGp62Ee/pZFhMXcnXTW2ckse5XP6o3BOM=";
   };
 
   build-system = [
-    cython_0
+    cython
     setuptools
   ];