diff --git a/nixos/modules/installer/tools/nix-fallback-paths.nix b/nixos/modules/installer/tools/nix-fallback-paths.nix
index bd09724ebfa2..2df7b1ae2d2d 100644
--- a/nixos/modules/installer/tools/nix-fallback-paths.nix
+++ b/nixos/modules/installer/tools/nix-fallback-paths.nix
@@ -1,7 +1,7 @@
 {
-  x86_64-linux = "/nix/store/6g4fla3vkcxihph282a0v3cd10709y7c-nix-2.9.1";
-  i686-linux = "/nix/store/j143221z44469zx21f5m9a47x7y1jpr5-nix-2.9.1";
-  aarch64-linux = "/nix/store/c4z3vy1sgm49la8bvmdrrpssgk4iw2nk-nix-2.9.1";
-  x86_64-darwin = "/nix/store/cqdwb7khf6zg94bz7lnvfjqx6z775qaw-nix-2.9.1";
-  aarch64-darwin = "/nix/store/1brkxcs287n1px2i4fq39l7h51hjv0f8-nix-2.9.1";
+  x86_64-linux = "/nix/store/qx384jvdjk2vzd2wpr9pmkcimk12g3as-nix-2.10.2";
+  i686-linux = "/nix/store/8mhknp6flnlnbj11zmskb3972ia1mdl5-nix-2.10.2";
+  aarch64-linux = "/nix/store/digzqw2vgdsg0fdzf7qlwbl4xii9i458-nix-2.10.2";
+  x86_64-darwin = "/nix/store/w62jxmpvjykw707qr9s5nxi90r35xqmd-nix-2.10.2";
+  aarch64-darwin = "/nix/store/6pjrn22f57n854x88a9kkbqnxw1yai73-nix-2.10.2";
 }
diff --git a/pkgs/tools/package-management/nix/common.nix b/pkgs/tools/package-management/nix/common.nix
index 25684ef3a7ae..0d42c9e2c71a 100644
--- a/pkgs/tools/package-management/nix/common.nix
+++ b/pkgs/tools/package-management/nix/common.nix
@@ -11,6 +11,7 @@ let
   atLeast24 = lib.versionAtLeast version "2.4pre";
   atLeast25 = lib.versionAtLeast version "2.5pre";
   atLeast27 = lib.versionAtLeast version "2.7pre";
+  atLeast210 = lib.versionAtLeast version "2.10pre";
 in
 { stdenv
 , autoconf-archive
@@ -176,6 +177,7 @@ self = stdenv.mkDerivation {
   installFlags = [ "sysconfdir=$(out)/etc" ];
 
   doInstallCheck = true;
+  installCheckTarget = if atLeast210 then "installcheck" else null;
 
   # socket path becomes too long otherwise
   preInstallCheck = lib.optionalString stdenv.isDarwin ''
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 24e93a6d66e2..d7a6e4e80670 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -47,39 +47,13 @@ in lib.makeExtensible (self: {
     };
   }).override { boehmgc = boehmgc-nix_2_3; };
 
-  nix_2_4 = common {
-    version = "2.4";
-    sha256 = "sha256-op48CCDgLHK0qV1Batz4Ln5FqBiRjlE6qHTiZgt3b6k=";
-    # https://github.com/NixOS/nix/pull/5537
-    patches = [ ./patches/install-nlohmann_json-headers.patch ];
-  };
+  nix_2_4 = throw "nixVersions.nix_2_4 has been removed";
 
-  nix_2_5 = common {
-    version = "2.5.1";
-    sha256 = "sha256-GOsiqy9EaTwDn2PLZ4eFj1VkXcBUbqrqHehRE9GuGdU=";
-    # https://github.com/NixOS/nix/pull/5536
-    patches = [ ./patches/install-nlohmann_json-headers.patch ];
-  };
+  nix_2_5 = throw "nixVersions.nix_2_5 has been removed";
 
-  nix_2_6 = common {
-    version = "2.6.1";
-    sha256 = "sha256-E9iQ7f+9Z6xFcUvvfksTEfn8LsDfzmwrcRBC//5B3V0=";
-  };
+  nix_2_6 = throw "nixVersions.nix_2_6 has been removed";
 
-  nix_2_7 = common {
-    version = "2.7.0";
-    sha256 = "sha256-m8tqCS6uHveDon5GSro5yZor9H+sHeh+v/veF1IGw24=";
-    patches = [
-      # remove when there's a 2.7.1 release
-      # https://github.com/NixOS/nix/pull/6297
-      # https://github.com/NixOS/nix/issues/6243
-      # https://github.com/NixOS/nixpkgs/issues/163374
-      (fetchpatch {
-        url = "https://github.com/NixOS/nix/commit/c9afca59e87afe7d716101e6a75565b4f4b631f7.patch";
-        sha256 = "sha256-xz7QnWVCI12lX1+K/Zr9UpB93b10t1HS9y/5n5FYf8Q=";
-      })
-    ];
-  };
+  nix_2_7 = throw "nixVersions.nix_2_7 has been removed";
 
   nix_2_8 = common {
     version = "2.8.1";
@@ -87,19 +61,17 @@ in lib.makeExtensible (self: {
   };
 
   nix_2_9 = common {
-    version = "2.9.1";
-    sha256 = "sha256-qNL3lQPBsnStkru3j1ajN/H+knXI+X3dku8/dBfSw3g=";
-    patches = [
-      # add missing --git-dir flags
-      # remove once 2.9.2 is out
-      (fetchpatch {
-        url = "https://github.com/NixOS/nix/commit/1a994cc35b33dcfd484e7a96be0e76e23bfb9029.patch";
-        sha256 = "sha256-7rDlqWRSVPijbvrTm4P+YykbMWyJryorXqGLEgg8/Wo=";
-      })
-    ];
+    version = "2.9.2";
+    sha256 = "sha256-uZCaBo9rdWRO/AlQMvVVjpAwzYijB2H5KKQqde6eHkg=";
   };
 
-  stable = self.nix_2_9;
+  nix_2_10 = common {
+    version = "2.10.2";
+    sha256 = "sha256-/8zlkXoZEZd+LgJq5xw8h+u2STqeKLrGTARZklE3CP8=";
+    patches = [ ./patches/flaky-tests.patch ];
+  };
+
+  stable = self.nix_2_10;
 
   unstable = self.stable;
 })
diff --git a/pkgs/tools/package-management/nix/patches/flaky-tests.patch b/pkgs/tools/package-management/nix/patches/flaky-tests.patch
new file mode 100644
index 000000000000..3684b09f6ffa
--- /dev/null
+++ b/pkgs/tools/package-management/nix/patches/flaky-tests.patch
@@ -0,0 +1,12 @@
+diff --git a/mk/run_test.sh b/mk/run_test.sh
+index 7e95df2ac..58420c317 100755
+--- a/mk/run_test.sh
++++ b/mk/run_test.sh
+@@ -27,7 +27,6 @@ run_test "$1"
+ # appear randomly without anyone knowing why.
+ # See https://github.com/NixOS/nix/issues/3605 for more info
+ if [[ $status -ne 0 && $status -ne 99 && \
+-    "$(uname)" == "Darwin" && \
+     "$log" =~ "unexpected EOF reading a line" \
+ ]]; then
+     echo "$post_run_msg [${yellow}FAIL$normal] (possibly flaky, so will be retried)"
diff --git a/pkgs/tools/package-management/nix/patches/install-nlohmann_json-headers.patch b/pkgs/tools/package-management/nix/patches/install-nlohmann_json-headers.patch
deleted file mode 100644
index 8b92de229032..000000000000
--- a/pkgs/tools/package-management/nix/patches/install-nlohmann_json-headers.patch
+++ /dev/null
@@ -1,36 +0,0 @@
-From 3884f7a69a57d8ecfcbcaae476ec2ff53ffbd549 Mon Sep 17 00:00:00 2001
-From: Robert Hensing <robert@roberthensing.nl>
-Date: Thu, 11 Nov 2021 11:03:21 +0100
-Subject: [PATCH] Install nlohmann_json headers
-
-These headers are included by the libexpr, libfetchers, libstore
-and libutil headers.
-Considering that these are vendored sources, Nix should expose them,
-as it is not a good idea for reverse dependencies to rely on a
-potentially different source that can go out of sync.
----
- Makefile              | 1 +
- src/nlohmann/local.mk | 2 ++
- 2 files changed, 3 insertions(+)
- create mode 100644 src/nlohmann/local.mk
-
-diff --git a/Makefile b/Makefile
-index 5040d288485..e6ce50cbdb7 100644
---- a/Makefile
-+++ b/Makefile
-@@ -10,6 +10,7 @@ makefiles = \
-   src/libexpr/local.mk \
-   src/libcmd/local.mk \
-   src/nix/local.mk \
-+  src/nlohmann/local.mk \
-   src/resolve-system-dependencies/local.mk \
-   scripts/local.mk \
-   misc/bash/local.mk \
-diff --git a/src/nlohmann/local.mk b/src/nlohmann/local.mk
-new file mode 100644
-index 00000000000..63c427e000e
---- /dev/null
-+++ b/src/nlohmann/local.mk
-@@ -0,0 +1,2 @@
-+$(foreach i, $(wildcard src/nlohmann/*.hpp), \
-+  $(eval $(call install-file-in, $(i), $(includedir)/nlohmann, 0644)))
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 935a29c3fc09..24b62cdda7c8 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -16470,7 +16470,7 @@ with pkgs;
 
   rman = callPackage ../development/tools/misc/rman { };
 
-  rnix-lsp = callPackage ../development/tools/rnix-lsp { };
+  rnix-lsp = callPackage ../development/tools/rnix-lsp { nix = nixVersions.nix_2_9; };
 
   rnginline = with python3Packages; toPythonApplication rnginline;