diff --git a/.eslintrc.cjs b/.eslintrc.cjs
deleted file mode 100644
index 38e07b3..0000000
--- a/.eslintrc.cjs
+++ /dev/null
@@ -1,46 +0,0 @@
-/** @type {import("eslint").Linter.Config} */
-const config = {
-  root: true,
-  parser: "@typescript-eslint/parser",
-  plugins: ["isaacscript", "import"],
-  extends: [
-    "plugin:@typescript-eslint/recommended-type-checked",
-    "plugin:@typescript-eslint/stylistic-type-checked",
-    "plugin:prettier/recommended",
-  ],
-  parserOptions: {
-    ecmaVersion: "latest",
-    sourceType: "module",
-    tsconfigRootDir: __dirname,
-    project: ["./tsconfig.json"],
-  },
-  overrides: [
-    // Template files don't have reliable type information
-    {
-      extends: ["plugin:@typescript-eslint/disable-type-checked"],
-    },
-  ],
-  rules: {
-    // These off/not-configured-the-way-we-want lint rules we like & opt into
-    "@typescript-eslint/no-explicit-any": "error",
-    "@typescript-eslint/no-unused-vars": [
-      "error",
-      { argsIgnorePattern: "^_", destructuredArrayIgnorePattern: "^_" },
-    ],
-    "@typescript-eslint/consistent-type-imports": [
-      "error",
-      { prefer: "type-imports", fixStyle: "inline-type-imports" },
-    ],
-    "import/consistent-type-specifier-style": ["error", "prefer-inline"],
-
-    // For educational purposes we format our comments/jsdoc nicely
-    "isaacscript/complete-sentences-jsdoc": "warn",
-    "isaacscript/format-jsdoc-comments": "warn",
-
-    // These lint rules don't make sense for us but are enabled in the preset configs
-    "@typescript-eslint/no-confusing-void-expression": "off",
-    "@typescript-eslint/restrict-template-expressions": "off",
-  },
-};
-
-module.exports = config;
diff --git a/biome.json b/biome.json
index a8829cb..3ab38fb 100644
--- a/biome.json
+++ b/biome.json
@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/1.7.3/schema.json",
+  "$schema": "./node_modules/@biomejs/biome/configuration_schema.json",
   "formatter": {
     "enabled": true,
     "formatWithErrors": true,
@@ -9,6 +9,9 @@
     "lineWidth": 80,
     "attributePosition": "auto"
   },
+  "files": {
+    "ignore": ["node_modules"]
+  },
   "organizeImports": { "enabled": true },
   "linter": {
     "enabled": true,
diff --git a/bun.lockb b/bun.lockb
index 48bbed2..fedca7f 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/eslint.config.mjs b/eslint.config.mjs
new file mode 100644
index 0000000..f43d771
--- /dev/null
+++ b/eslint.config.mjs
@@ -0,0 +1,36 @@
+import { fixupPluginRules } from "@eslint/compat";
+import tseslint from "typescript-eslint";
+import eslint from "@eslint/js";
+import deprecationPlugin from "eslint-plugin-deprecation";
+import eslintCommentsPlugin from "eslint-plugin-eslint-comments";
+import importPlugin from "eslint-plugin-import";
+import simpleImportSortPlugin from "eslint-plugin-simple-import-sort";
+
+export default tseslint.config(
+  {
+    plugins: {
+      "@typescript-eslint": tseslint.plugin,
+      deprecation: fixupPluginRules(deprecationPlugin),
+      "eslint-comments": eslintCommentsPlugin,
+      import: fixupPluginRules(importPlugin),
+      "simple-import-sort": simpleImportSortPlugin,
+    },
+  },
+  {
+    ignores: ["**/node_modules/**", "**/public/**"],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+  ...tseslint.configs.stylisticTypeChecked,
+  {
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+        ecmaVersion: "latest",
+        sourceType: "module",
+        project: ["./tsconfig.json"],
+      },
+    },
+  },
+);
diff --git a/package.json b/package.json
index d9ca354..934da9b 100644
--- a/package.json
+++ b/package.json
@@ -8,14 +8,15 @@
     "css": "cpy 'node_modules/@picocss/pico/css/pico.lime.min.css' 'src/public/' --flat",
     "lint": "run-p 'lint:*'",
     "lint:tsc": "tsc --noEmit",
-    "lint:knip": "knip"
+    "lint:knip": "knip",
+    "lint:biome": "biome lint --error-on-warnings ./src"
   },
   "dependencies": {
     "@elysiajs/cookie": "^0.8.0",
     "@elysiajs/html": "1.0.2",
     "@elysiajs/jwt": "^1.1.0",
     "@elysiajs/static": "1.0.3",
-    "elysia": "^1.1.4"
+    "elysia": "^1.1.5"
   },
   "module": "src/index.tsx",
   "type": "module",
@@ -24,6 +25,8 @@
   },
   "devDependencies": {
     "@biomejs/biome": "1.8.3",
+    "@eslint/compat": "^1.1.1",
+    "@eslint/js": "^9.8.0",
     "@ianvs/prettier-plugin-sort-imports": "^4.3.1",
     "@kitajs/ts-html-plugin": "^4.0.2",
     "@picocss/pico": "^2.0.6",
@@ -31,20 +34,22 @@
     "@types/bun": "^1.1.6",
     "@types/eslint": "^9.6.0",
     "@types/node": "^22.1.0",
-    "@typescript-eslint/eslint-plugin": "^8.0.0",
-    "@typescript-eslint/parser": "^8.0.0",
+    "@typescript-eslint/eslint-plugin": "^8.0.1",
+    "@typescript-eslint/parser": "^8.0.1",
     "cpy-cli": "^5.0.0",
     "eslint": "^9.8.0",
     "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-deprecation": "^3.0.0",
+    "eslint-plugin-eslint-comments": "^3.2.0",
     "eslint-plugin-import": "^2.29.1",
     "eslint-plugin-isaacscript": "^3.12.2",
     "eslint-plugin-prettier": "^5.2.1",
+    "eslint-plugin-simple-import-sort": "^12.1.1",
     "knip": "^5.27.0",
     "npm-run-all": "^4.1.5",
     "prettier": "^3.3.3",
-    "typescript": "^5.5.4"
+    "typescript": "^5.5.4",
+    "typescript-eslint": "^8.0.1"
   },
-  "trustedDependencies": [
-    "@biomejs/biome"
-  ]
+  "trustedDependencies": ["@biomejs/biome"]
 }
diff --git a/tsconfig.json b/tsconfig.json
index 6547452..e88c4a9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "lib": ["ESNext"],
-    "module": "esnext",
-    "target": "esnext",
+    "module": "ESNext",
+    "target": "ES2021",
     "moduleResolution": "bundler",
     "moduleDetection": "force",
     "allowImportingTsExtensions": true,