diff --git a/templates/sci/flake.nix b/templates/sci/flake.nix
index 75b64b5..026f2dc 100644
--- a/templates/sci/flake.nix
+++ b/templates/sci/flake.nix
@@ -82,6 +82,8 @@
               };
               bashBeforeWrapper = {
                 pydev = [
+                  "export UV_PYTHON=${pkgs.py.interpreter}"
+                  "export UV_PYTHON_DOWNLOADS=\"never\""
                   "uv sync"
                 ];
               };