diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index db9b2c9465fa..7df444177c5e 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -77,17 +77,12 @@ common =
 
       propagatedBuildInputs = [ boehmgc ];
 
-      # Seems to be required when using std::atomic with 64-bit types
-      NIX_LDFLAGS =
-        # need to list libraries individually until
+      NIX_LDFLAGS = lib.optionals (!is24) [
         # https://github.com/NixOS/nix/commit/3e85c57a6cbf46d5f0fe8a89b368a43abd26daba
-        # is in a release
-          lib.optionalString enableStatic "-lssl -lbrotlicommon -lssh2 -lz -lnghttp2 -lcrypto"
-
-        # need to detect it here until
+        (lib.optionalString enableStatic "-lssl -lbrotlicommon -lssh2 -lz -lnghttp2 -lcrypto")
         # https://github.com/NixOS/nix/commits/74b4737d8f0e1922ef5314a158271acf81cd79f8
-        # is in a release
-        + lib.optionalString (stdenv.hostPlatform.system == "armv5tel-linux" || stdenv.hostPlatform.system == "armv6l-linux") "-latomic";
+        (lib.optionalString (stdenv.hostPlatform.system == "armv5tel-linux" || stdenv.hostPlatform.system == "armv6l-linux") "-latomic")
+      ];
 
       preConfigure =
         # Copy libboost_context so we don't get all of Boost in our closure.
@@ -152,7 +147,7 @@ common =
         export TMPDIR=$NIX_BUILD_TOP
       '';
 
-      separateDebugInfo = stdenv.isLinux;
+      separateDebugInfo = stdenv.isLinux && (is24 -> !enableStatic);
 
       enableParallelBuilding = true;
 
@@ -218,7 +213,9 @@ in rec {
 
   nix = nixStable;
 
-  nixStable = callPackage common (rec {
+  nixStable = nix_2_3;
+
+  nix_2_3 = callPackage common (rec {
     pname = "nix";
     version = "2.3.16";
     src = fetchurl {
@@ -233,13 +230,13 @@ in rec {
 
   nix_2_4 = callPackage common (rec {
     pname = "nix";
-    version = "2.4pre-rc1";
+    version = "2.4";
 
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
       rev = version;
-      sha256 = "sha256-KOb8etMm5LksvT2l+CkvqzMO1bgmo9tJmyaNh0LvaR8=";
+      sha256 = "sha256-op48CCDgLHK0qV1Batz4Ln5FqBiRjlE6qHTiZgt3b6k=";
     };
 
     boehmgc = boehmgc_nixUnstable;
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 388da7860a17..a320f6a29a29 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -590,7 +590,7 @@ mapAliases ({
   nginxUnstable = nginxMainline; # added 2018-04-25
   nilfs_utils = nilfs-utils; # added 2018-04-25
   nix-review = nixpkgs-review; # added 2019-12-22
-  nixFlakes = nixUnstable; # added 2021-05-21
+  nixFlakes = nix_2_4; # added 2021-05-21
   nmap_graphical = nmap-graphical;  # added 2017-01-19
   nmap-unfree = nmap; # added 2021-04-06
   nologin = shadow; # added 2018-04-25
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e7fbbf80de40..56c15d52b3d5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -32252,6 +32252,7 @@ with pkgs;
       })
     nix
     nixStable
+    nix_2_3
     nix_2_4
     nixUnstable;