diff --git a/pkgs/development/libraries/nix-plugins/default.nix b/pkgs/development/libraries/nix-plugins/default.nix
index 1d3c32103803..e626c3abfe2f 100644
--- a/pkgs/development/libraries/nix-plugins/default.nix
+++ b/pkgs/development/libraries/nix-plugins/default.nix
@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
     hash = "sha256-AkHsZpYM4EY8SNuF6LhxF2peOjp69ICGc3kOLkDms64=";
   };
 
+  patches = [ ./nix-2.9.patch ];
+
   nativeBuildInputs = [ cmake pkg-config ];
 
   buildInputs = [ nix boost ];
diff --git a/pkgs/development/libraries/nix-plugins/nix-2.9.patch b/pkgs/development/libraries/nix-plugins/nix-2.9.patch
new file mode 100644
index 000000000000..f1dc2909175d
--- /dev/null
+++ b/pkgs/development/libraries/nix-plugins/nix-2.9.patch
@@ -0,0 +1,35 @@
+diff --git a/extra-builtins.cc b/extra-builtins.cc
+index 617807a..c417cb3 100644
+--- a/extra-builtins.cc
++++ b/extra-builtins.cc
+@@ -27,7 +27,7 @@ static ExtraBuiltinsSettings extraBuiltinsSettings;
+ 
+ static GlobalConfig::Register rp(&extraBuiltinsSettings);
+ 
+-static void extraBuiltins(EvalState & state, const Pos & pos,
++static void extraBuiltins(EvalState & state, const PosIdx pos,
+     Value ** _args, Value & v)
+ {
+     static auto extraBuiltinsFile = absPath(extraBuiltinsSettings.extraBuiltinsFile);
+@@ -44,10 +44,10 @@ static void extraBuiltins(EvalState & state, const Pos & pos,
+             auto attrs = state.buildBindings(2);
+ 
+             auto sExec = state.symbols.create("exec");
+-            attrs.alloc(sExec).mkPrimOp(new PrimOp { .fun = prim_exec, .arity = 1, .name = sExec });
++            attrs.alloc(sExec).mkPrimOp(new PrimOp { .fun = prim_exec, .arity = 1, .name = "exec" });
+ 
+             auto sImportNative = state.symbols.create("importNative");
+-            attrs.alloc(sImportNative).mkPrimOp(new PrimOp { .fun = prim_importNative, .arity = 2, .name = sImportNative });
++            attrs.alloc(sImportNative).mkPrimOp(new PrimOp { .fun = prim_importNative, .arity = 2, .name = "importNative" });
+ 
+             arg = state.allocValue();
+             arg->mkAttrs(attrs);
+@@ -64,7 +64,7 @@ static void extraBuiltins(EvalState & state, const Pos & pos,
+ static RegisterPrimOp rp1("__extraBuiltins", 0,
+     extraBuiltins);
+ 
+-static void cflags(EvalState & state, const Pos & _pos,
++static void cflags(EvalState & state, const PosIdx _pos,
+     Value ** _args, Value & v)
+ {
+     auto attrs = state.buildBindings(3);
diff --git a/pkgs/tools/package-management/nix-eval-jobs/default.nix b/pkgs/tools/package-management/nix-eval-jobs/default.nix
index 2fb514cf2932..7e3f489b084a 100644
--- a/pkgs/tools/package-management/nix-eval-jobs/default.nix
+++ b/pkgs/tools/package-management/nix-eval-jobs/default.nix
@@ -11,12 +11,12 @@
 }:
 stdenv.mkDerivation rec {
   pname = "nix-eval-jobs";
-  version = "0.0.6";
+  version = "2.9.0";
   src = fetchFromGitHub {
     owner = "nix-community";
     repo = pname;
     rev = "v${version}";
-    hash = "sha256-NCUVRiZqg9JgS+hlAczvPDb0M5uIwyyqhdKe5K1P360=";
+    hash = "sha256-fN9D1rqJ4UFmCykTK8cU0oPWqN3wR8m9/zQ6fwVdBcY=";
   };
   buildInputs = [
     boost
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 44877c94c25b..b91ee5c9ee60 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -85,7 +85,20 @@ in lib.makeExtensible (self: {
     sha256 = "sha256-zldZ4SiwkISFXxrbY/UdwooIZ3Z/I6qKxtpc3zD0T/o=";
   };
 
-  stable = self.nix_2_8;
+  nix_2_9 = common {
+    version = "2.9.0";
+    sha256 = "sha256-W6aTsTpCTb+vXQEXDjnKqetOuJmEfSuK2CXvAMqwo74=";
+    patches = [
+      # can be removed when updated to 2.9.1
+      (fetchpatch {
+        name = "fix-segfault-in-git-fetcher";
+        url = "https://github.com/NixOS/nix/commit/bc4759345538c89e1f045aaabcc0cafe4ecca12a.patch";
+        sha256 = "sha256-UrfH4M7a02yfE9X3tA1Pwhw4RacBW+rShYkl7ybG64I=";
+      })
+    ];
+  };
+
+  stable = self.nix_2_9;
 
   # remember to backport updates to the stable branch!
   unstable = lib.lowPrio (common rec {