diff --git a/pkgs/development/python-modules/ruyaml/default.nix b/pkgs/development/python-modules/ruyaml/default.nix
index 3ddede9d8c5a..8779325d9b23 100644
--- a/pkgs/development/python-modules/ruyaml/default.nix
+++ b/pkgs/development/python-modules/ruyaml/default.nix
@@ -37,6 +37,10 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  pytestFlagsArray = [
+    "-W" "ignore::DeprecationWarning"
+  ];
+
   pythonImportsCheck = [
     "ruyaml"
   ];