diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 08bee17e..30019862 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -57,7 +57,8 @@ pages:
   stage: deploy
   image: nixos/nix:2.18.2
   script:
-    - direnv exec . mdbook build
+    - nix build .#website-root
+    - cp --recursive --dereference result public
   artifacts:
     paths:
       - public
diff --git a/book.toml b/book.toml
index 038e5202..eb6c2bdf 100644
--- a/book.toml
+++ b/book.toml
@@ -5,7 +5,7 @@ multilingual = false
 src = "book"
 
 [build]
-build-dir = "public"
+build-dir = "target/book"
 
 [output.html]
 git-repository-icon = "fa-git-square"
diff --git a/flake.nix b/flake.nix
index aae3883b..0d6f516e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -65,6 +65,8 @@
               (fenix.targets.${target}.fromManifestFile inputs.rust-manifest)
               .withComponents components)
             targets);
+
+        website-root = self.callPackage ./nix/pkgs/website-root {};
       });
     in
     inputs.flake-utils.lib.eachDefaultSystem (system:
@@ -81,6 +83,7 @@
       {
         packages = {
           default = (mkScope pkgs).default;
+          website-root = (mkScope pkgs).website-root;
         }
         //
         builtins.listToAttrs
diff --git a/nix/pkgs/website-root/default.nix b/nix/pkgs/website-root/default.nix
new file mode 100644
index 00000000..bbb93a25
--- /dev/null
+++ b/nix/pkgs/website-root/default.nix
@@ -0,0 +1,28 @@
+# Keep sorted
+{ inputs
+, lib
+, mdbook
+, stdenv
+}:
+
+stdenv.mkDerivation {
+  name = "website-root";
+
+  src = let filter = inputs.nix-filter.lib; in filter {
+    root = inputs.self;
+
+    # Keep sorted
+    include = [
+      "book"
+      "book.toml"
+    ];
+  };
+
+  buildPhase = ''
+    ${lib.getExe mdbook} build
+  '';
+
+  installPhase = ''
+    mv target/book $out
+  '';
+}