diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 3e732e442297..38401379a6cc 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -2197,10 +2197,10 @@ in {
   cython = callPackage ../development/python-modules/Cython { };
 
   cython_3 = self.cython.overridePythonAttrs (old: rec {
-    version = "3.0.0a10";
+    version = "3.0.0a11";
     src = old.src.override {
       inherit version;
-      sha256 = "342e95121a3d1a67cbcf7b340391eb40cc5ce3d2a79d7873e005e8783353d89d";
+      hash = "sha256-5GckkfsxVGuau2Nnf2OOc4CF3JMhOYFwlW72+/wOFyY=";
     };
     patches = [ ];
   });