diff --git a/build/builder.sh b/build/builder.sh
index 6a5fe67..231f534 100644
--- a/build/builder.sh
+++ b/build/builder.sh
@@ -15,6 +15,4 @@ mkdir $out
 cp -r public/$publicPath/* $out/
 
 # Render math in HTML and XML files.
-node $server &
-sleep 1
-find $out/ -regex "$out/.*\.html" | xargs ruby $converter
+find $out/ -regex "$out/.*\.html" | xargs katex-html
diff --git a/flake.lock b/flake.lock
index 8bedb8d..b71ffb7 100644
--- a/flake.lock
+++ b/flake.lock
@@ -52,7 +52,106 @@
         "type": "github"
       }
     },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_3": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "katex-html": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "katex-server": "katex-server",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1648430978,
+        "narHash": "sha256-12Bj/RX6rb5ooHHeqIBLa2kizGW9syFyUOQVDzVzGzI=",
+        "ref": "master",
+        "rev": "fc26bcf07b5d22cbd4f378130a8fd6d8b0ede9ce",
+        "revCount": 6,
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-html"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-html"
+      }
+    },
+    "katex-server": {
+      "inputs": {
+        "flake-utils": "flake-utils_3",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1648429554,
+        "narHash": "sha256-jNRd9gzrOIYlvuVr/Je2Uh6/FXRoGwAIjgVHhf2NOoE=",
+        "ref": "master",
+        "rev": "a277542d9b7eb23806b123aed41a0bd441ff669b",
+        "revCount": 4,
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-server"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://dev.danilafe.com/Nix-Configs/katex-server"
+      }
+    },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1648425779,
+        "narHash": "sha256-0tcpEiiq3f3Hh77ax7QFuF15AnPaBIdDSbvrCUeyb9k=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1edfe6d91bd8348cfccacd72e82d1d06ad470117",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1648425779,
+        "narHash": "sha256-0tcpEiiq3f3Hh77ax7QFuF15AnPaBIdDSbvrCUeyb9k=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "1edfe6d91bd8348cfccacd72e82d1d06ad470117",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
       "locked": {
         "lastModified": 1634881110,
         "narHash": "sha256-glFqhVeqPuT99vfKrOH7lmJDrgwP99KJJSFpgpyvbko=",
@@ -72,7 +171,8 @@
         "blog-source": "blog-source",
         "blog-source-localized": "blog-source-localized",
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "katex-html": "katex-html",
+        "nixpkgs": "nixpkgs_3"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index 4d950f5..cdf33ee 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,7 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs";
     flake-utils.url = "github:numtide/flake-utils";
+    katex-html.url = "git+https://dev.danilafe.com/Nix-Configs/katex-html";
     blog-source = {
       flake = false;
       url = "https://dev.danilafe.com/Web-Projects/blog-static.git";
@@ -17,12 +18,18 @@
     };
   };
 
-  outputs = { self, blog-source, blog-source-localized, nixpkgs, flake-utils }:
+  outputs = { self, blog-source, blog-source-localized, nixpkgs, flake-utils, katex-html }:
     {
       buildersFor = system: import ./lib.nix {
         inherit blog-source blog-source-localized;
         pkgs = import nixpkgs { inherit system; };
+	katex-html = katex-html.defaultPackage.${system};
       };
       nixosModule = (import ./module.nix);
+      packages.x86_64-linux.blog-debug = (import ./lib.nix {
+        inherit blog-source blog-source-localized;
+	pkgs = import nixpkgs { system = "x86_64-linux"; };
+	katex-html = katex-html.defaultPackage."x86_64-linux";
+      }).english { host = "danilafe.com"; };
     };
 }
diff --git a/lib.nix b/lib.nix
index daf8b7d..eb13031 100644
--- a/lib.nix
+++ b/lib.nix
@@ -1,4 +1,4 @@
-{ blog-source, blog-source-localized, pkgs }:
+{ blog-source, blog-source-localized, pkgs, katex-html }:
 
 with pkgs;
 
@@ -16,10 +16,8 @@ let
     publicPath = settings.path;
     extraFlags = if settings.drafts then " -D " else "";
     builder = ./build/builder.sh;
-    converter = ./build/convert.rb;
-    server = ./build/katexserver.js;
     buildInputs = [
-      hugo nodejs
+      hugo nodejs katex-html
       requiredPackages."katex-0.11.1"
       requiredPackages.express
       requiredPackages.body-parser