diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 29948d9da1f1..d8b2d21dbb02 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -133,5 +133,5 @@ in lib.makeExtensible (self: {
 
   stable = self.nix_2_13;
 
-  unstable = self.nix_2_14;
+  unstable = self.nix_2_15;
 })