diff --git a/tests/all-package-defaults.nix b/tests/all-package-defaults.nix
index 37e887a3..cf0db72e 100644
--- a/tests/all-package-defaults.nix
+++ b/tests/all-package-defaults.nix
@@ -13,6 +13,10 @@ let
   };
 
   disabledTests = [
+    # TODO 2025-10-24
+    # build failure (fixed in https://github.com/NixOS/nixpkgs/pull/455238)
+    "yamlfix"
+
     # TODO: 2025-10-03
     # Transient dependency `vmr` has a build failure
     # https://github.com/NixOS/nixpkgs/issues/431811
diff --git a/tests/test-sources/plugins/by-name/none-ls/default.nix b/tests/test-sources/plugins/by-name/none-ls/default.nix
index c71f5549..f3cd6217 100644
--- a/tests/test-sources/plugins/by-name/none-ls/default.nix
+++ b/tests/test-sources/plugins/by-name/none-ls/default.nix
@@ -97,6 +97,10 @@
         sources =
           let
             disabled = [
+              # TODO Added 2025-10-24
+              # build failure (fixed in https://github.com/NixOS/nixpkgs/pull/455238)
+              "yamlfix"
+
               # TODO Added 2025-10-12
               # mbedtls is marked insecure
               "haxe_formatter"