diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 5b001cea2327..a489871452c4 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -183,6 +183,20 @@ lib.makeExtensible (
       # depend on the components they need in `nixComponents_2_26`.
       nix_2_26 = addTests "nix_2_26" self.nixComponents_2_26.nix-everything;
 
+      nixComponents_2_27 = nixDependencies.callPackage ./modular/packages.nix {
+        version = "2.27.1";
+        inherit (self.nix_2_24.meta) maintainers;
+        otherSplices = generateSplicesForNixComponents "nixComponents_2_26";
+        src = fetchFromGitHub {
+          owner = "NixOS";
+          repo = "nix";
+          rev = "9cb662df7442a1e2c4600fb8ecb2ad613ebc5a95";
+          hash = "sha256-rBPulEBpn4IiqkPsetuh7BRzT2iGCzZYnogTAsbrvhU=";
+        };
+      };
+
+      nix_2_27 = addTests "nix_2_27" self.nixComponents_2_27.nix-everything;
+
       latest = self.nix_2_26;
 
       # The minimum Nix version supported by Nixpkgs
diff --git a/pkgs/tools/package-management/nix/modular/src/libfetchers-tests/package.nix b/pkgs/tools/package-management/nix/modular/src/libfetchers-tests/package.nix
index 1e379fc5ade2..ae5b4e4d87d0 100644
--- a/pkgs/tools/package-management/nix/modular/src/libfetchers-tests/package.nix
+++ b/pkgs/tools/package-management/nix/modular/src/libfetchers-tests/package.nix
@@ -7,6 +7,7 @@
   nix-fetchers,
   nix-store-test-support,
 
+  libgit2,
   rapidcheck,
   gtest,
   runCommand,
@@ -42,6 +43,8 @@ mkMesonExecutable (finalAttrs: {
     nix-store-test-support
     rapidcheck
     gtest
+  ] ++ lib.optionals (lib.versionAtLeast version "2.27") [
+    libgit2
   ];
 
   mesonFlags = [
diff --git a/pkgs/tools/package-management/nix/modular/src/libstore/package.nix b/pkgs/tools/package-management/nix/modular/src/libstore/package.nix
index 31867d331b92..bba96e07f312 100644
--- a/pkgs/tools/package-management/nix/modular/src/libstore/package.nix
+++ b/pkgs/tools/package-management/nix/modular/src/libstore/package.nix
@@ -78,7 +78,7 @@ mkMesonLibrary (finalAttrs: {
       (lib.mesonOption "sandbox-shell" "${busybox-sandbox-shell}/bin/busybox")
     ];
 
-  env = {
+  env = lib.optionalAttrs (!lib.versionAtLeast version "2.27") {
     # Needed for Meson to find Boost.
     # https://github.com/NixOS/nixpkgs/issues/86131.
     BOOST_INCLUDEDIR = "${lib.getDev boost}/include";
diff --git a/pkgs/tools/package-management/nix/modular/src/libutil/package.nix b/pkgs/tools/package-management/nix/modular/src/libutil/package.nix
index 47dcb54a26f8..d9b56a7d1ceb 100644
--- a/pkgs/tools/package-management/nix/modular/src/libutil/package.nix
+++ b/pkgs/tools/package-management/nix/modular/src/libutil/package.nix
@@ -6,6 +6,7 @@
   boost,
   brotli,
   libarchive,
+  libblake3,
   libcpuid,
   libsodium,
   nlohmann_json,
@@ -42,6 +43,11 @@ mkMesonLibrary (finalAttrs: {
 
   buildInputs = [
     brotli
+  ]
+  ++ lib.optional (lib.versionAtLeast version "2.27") [
+    libblake3
+  ]
+  ++ [
     libsodium
     openssl
   ] ++ lib.optional stdenv.hostPlatform.isx86_64 libcpuid;
@@ -56,7 +62,7 @@ mkMesonLibrary (finalAttrs: {
     (lib.mesonEnable "cpuid" stdenv.hostPlatform.isx86_64)
   ];
 
-  env = {
+  env = lib.optionalAttrs (!lib.versionAtLeast version "2.27") {
     # Needed for Meson to find Boost.
     # https://github.com/NixOS/nixpkgs/issues/86131.
     BOOST_INCLUDEDIR = "${lib.getDev boost}/include";