diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 9818b0c9a254..35866d4331fc 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -186,6 +186,20 @@ lib.makeExtensible (
         self_attribute_name = "nix_2_28";
       };
 
+      nixComponents_2_29 = nixDependencies.callPackage ./modular/packages.nix rec {
+        version = "2.29.0";
+        inherit (self.nix_2_24.meta) maintainers teams;
+        otherSplices = generateSplicesForNixComponents "nixComponents_2_29";
+        src = fetchFromGitHub {
+          owner = "NixOS";
+          repo = "nix";
+          rev = version;
+          hash = "sha256-fkbE3RCIUPFjS9A6SoEJbgMW3Rs98cs0ZZV/eTtJjaU=";
+        };
+      };
+
+      nix_2_29 = addTests "nix_2_29" self.nixComponents_2_29.nix-everything;
+
       nixComponents_git = nixDependencies.callPackage ./modular/packages.nix rec {
         version = "2.30pre20250521_${lib.substring 0 8 src.rev}";
         inherit (self.nix_2_24.meta) maintainers teams;