1 files changed, 3 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/nbformat/default.nix b/nixpkgs/pkgs/development/python-modules/nbformat/default.nix
index 8b16ffb7e32b..fbc71202d286 100644
--- a/nixpkgs/pkgs/development/python-modules/nbformat/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/nbformat/default.nix
@@ -29,6 +29,9 @@ buildPythonPackage rec {
     export HOME=tmp
   '';
 
+  # Some of the tests use localhost networking.
+  __darwinAllowLocalNetworking = true;
+
   meta = {
     description = "The Jupyter Notebook format";
     homepage = https://jupyter.org/;