diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index a6f0ac7be39e..2a7810a977b9 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -191,6 +191,11 @@ in lib.makeExtensible (self: ({
     hash = "sha256-QMYAkdtU+g9HlZKtoJ+AI6TbWzzovKGnPZJHfZdclc8=";
   };
 
+  nix_2_18 = common {
+    version = "2.18.0";
+    hash = "sha256-ggISAuGpTkKp6JXt1BbcLtLDYOPECWqrVnPVgQEFHYc=";
+  };
+
   # The minimum Nix version supported by Nixpkgs
   # Note that some functionality *might* have been backported into this Nix version,
   # making this package an inaccurate representation of what features are available
@@ -210,7 +215,7 @@ in lib.makeExtensible (self: ({
 
   stable = self.nix_2_17;
 
-  unstable = self.stable;
+  unstable = self.nix_2_18;
 } // lib.optionalAttrs config.allowAliases {
   nix_2_4 = throw "nixVersions.nix_2_4 has been removed";
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f2a79e9f2fdf..7ae170ccb912 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9093,9 +9093,7 @@ with pkgs;
 
   hardinfo = callPackage ../tools/system/hardinfo { };
 
-  harmonia = callPackage ../tools/package-management/harmonia {
-    nix = nixVersions.unstable;
-  };
+  harmonia = callPackage ../tools/package-management/harmonia { };
 
   hayagriva = callPackage ../tools/typesetting/hayagriva { };