diff --git a/pkgs/development/python-modules/cython/default.nix b/pkgs/development/python-modules/cython/default.nix
index c7ccfa5295cc..796df1cad647 100644
--- a/pkgs/development/python-modules/cython/default.nix
+++ b/pkgs/development/python-modules/cython/default.nix
@@ -3,7 +3,6 @@
   buildPythonPackage,
   fetchFromGitHub,
   gdb,
-  isPyPy,
   ncurses,
   numpy,
   pkg-config,
@@ -16,31 +15,30 @@
 
 buildPythonPackage rec {
   pname = "cython";
-  version = "3.1.4";
+  version = "3.1.6";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "cython";
     repo = "cython";
     tag = version;
-    hash = "sha256-qFj7w0fQY6X1oADLsAgwFefzx92/Pmgv9j5S6v0sdPg=";
+    hash = "sha256-OB9DsGabbn5pE+8Ru29D3Jp9Wu+gwlHYYy79x+M+HPI=";
   };
 
   build-system = [
-    pkg-config
     setuptools
   ];
 
+  nativeBuildInputs = [
+    pkg-config
+  ];
+
   nativeCheckInputs = [
     gdb
     numpy
     ncurses
   ];
 
-  env = lib.optionalAttrs (!isPyPy) {
-    LC_ALL = "en_US.UTF-8";
-  };
-
   # https://github.com/cython/cython/issues/2785
   # Temporary solution
   doCheck = false;