diff --git a/app/(protected)/formations/[moduleId]/page.tsx b/app/(protected)/formations/[moduleId]/page.tsx
index 39e9540..6fb97d8 100644
--- a/app/(protected)/formations/[moduleId]/page.tsx
+++ b/app/(protected)/formations/[moduleId]/page.tsx
@@ -1,3 +1,4 @@
+import Link from "next/link";
 import { redirect } from "next/navigation";
 import { createClient } from "@/lib/supabase/server";
 import Card from "@/components/ui/Card";
@@ -40,12 +41,12 @@ export default async function ModulePage({ params }: ModulePageProps) {
     <div className="max-w-4xl">
       {/* Breadcrumb */}
       <nav className="flex items-center gap-2 text-sm mb-8">
-        <a
+        <Link
           href="/formations"
           className="text-white/40 hover:text-white transition-colors"
         >
           Formations
-        </a>
+        </Link>
         <span className="text-white/20">/</span>
         <span className="text-white/40">Semaine {module.week_number}</span>
         <span className="text-white/20">/</span>
@@ -150,7 +151,7 @@ export default async function ModulePage({ params }: ModulePageProps) {
 
       {/* Actions */}
       <div className="flex items-center justify-between">
-        <a
+        <Link
           href="/formations"
           className="text-white/40 hover:text-white text-sm transition-colors flex items-center gap-1"
         >
@@ -168,7 +169,7 @@ export default async function ModulePage({ params }: ModulePageProps) {
             />
           </svg>
           Retour aux formations
-        </a>
+        </Link>
 
         <MarkCompleteButton
           moduleId={moduleId}
diff --git a/app/globals.css b/app/globals.css
index dba1c83..9789af3 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -1,5 +1,5 @@
-@import "tailwindcss";
 @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');
+@import "tailwindcss";
 
 @theme inline {
   --color-primary: #6D5EF6;
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 05e726d..c85fb67 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -1,18 +1,16 @@
-import { defineConfig, globalIgnores } from "eslint/config";
-import nextVitals from "eslint-config-next/core-web-vitals";
-import nextTs from "eslint-config-next/typescript";
+import { dirname } from "path";
+import { fileURLToPath } from "url";
+import { FlatCompat } from "@eslint/eslintrc";
 
-const eslintConfig = defineConfig([
-  ...nextVitals,
-  ...nextTs,
-  // Override default ignores of eslint-config-next.
-  globalIgnores([
-    // Default ignores of eslint-config-next:
-    ".next/**",
-    "out/**",
-    "build/**",
-    "next-env.d.ts",
-  ]),
-]);
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+});
+
+const eslintConfig = [
+  ...compat.extends("next/core-web-vitals", "next/typescript"),
+];
 
 export default eslintConfig;
diff --git a/lib/utils.ts b/lib/utils.ts
index 30e9a55..313419e 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -1,8 +1,8 @@
-import { type ClassValue, clsx } from "clsx";
+import { clsx, type ClassValue } from "clsx";
 
 // Utilitaire pour combiner les classes CSS (compatible Tailwind)
 export function cn(...inputs: ClassValue[]) {
-  return inputs.filter(Boolean).join(" ");
+  return clsx(inputs);
 }
 
 // Formater un prix en euros
diff --git a/package-lock.json b/package-lock.json
index f6e3906..58c0463 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,19 +12,20 @@
         "@supabase/ssr": "^0.8.0",
         "@supabase/supabase-js": "^2.95.3",
         "clsx": "^2.1.1",
-        "next": "16.1.6",
-        "react": "19.2.3",
-        "react-dom": "19.2.3",
+        "next": "^15.5.12",
+        "react": "^18.3.1",
+        "react-dom": "^18.3.1",
         "resend": "^6.9.1",
         "stripe": "^20.3.1"
       },
       "devDependencies": {
+        "@eslint/eslintrc": "^3.3.3",
         "@tailwindcss/postcss": "^4",
         "@types/node": "^20",
-        "@types/react": "^19",
-        "@types/react-dom": "^19",
+        "@types/react": "^18.3.28",
+        "@types/react-dom": "^18.3.7",
         "eslint": "^9",
-        "eslint-config-next": "16.1.6",
+        "eslint-config-next": "^15.5.12",
         "tailwindcss": "^4",
         "typescript": "^5"
       }
@@ -42,246 +43,6 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
-    "node_modules/@babel/code-frame": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
-      "integrity": "sha512-9NhCeYjq9+3uxgdtp20LSiJXJvN0FeCtNGpJxuMFZ1Kv3cWUNb6DOhJwUvcVCzKGR66cw4njwM6hrJLqgOwbcw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/helper-validator-identifier": "^7.28.5",
-        "js-tokens": "^4.0.0",
-        "picocolors": "^1.1.1"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/compat-data": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.29.0.tgz",
-      "integrity": "sha512-T1NCJqT/j9+cn8fvkt7jtwbLBfLC/1y1c7NtCeXFRgzGTsafi68MRv8yzkYSapBnFA6L3U2VSc02ciDzoAJhJg==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/core": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.29.0.tgz",
-      "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
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-      "dependencies": {
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-        "@babel/generator": "^7.29.0",
-        "@babel/helper-compilation-targets": "^7.28.6",
-        "@babel/helper-module-transforms": "^7.28.6",
-        "@babel/helpers": "^7.28.6",
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-        "@babel/template": "^7.28.6",
-        "@babel/traverse": "^7.29.0",
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-        "@jridgewell/remapping": "^2.3.5",
-        "convert-source-map": "^2.0.0",
-        "debug": "^4.1.0",
-        "gensync": "^1.0.0-beta.2",
-        "json5": "^2.2.3",
-        "semver": "^6.3.1"
-      },
-      "engines": {
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-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/babel"
-      }
-    },
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-      "version": "7.29.1",
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-      },
-      "engines": {
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/code-frame": "^7.28.6",
-        "@babel/parser": "^7.28.6",
-        "@babel/types": "^7.28.6"
-      },
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-        "node": ">=6.9.0"
-      }
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-    "node_modules/@babel/traverse": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.29.0.tgz",
-      "integrity": "sha512-4HPiQr0X7+waHfyXPZpWPfWL/J7dcN1mx9gL6WdQVMbPnF3+ZhSMs8tCxN7oHddJE9fhNE7+lxdnlyemKfJRuA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/code-frame": "^7.29.0",
-        "@babel/generator": "^7.29.0",
-        "@babel/helper-globals": "^7.28.0",
-        "@babel/parser": "^7.29.0",
-        "@babel/template": "^7.28.6",
-        "@babel/types": "^7.29.0",
-        "debug": "^4.3.1"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
-    "node_modules/@babel/types": {
-      "version": "7.29.0",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.29.0.tgz",
-      "integrity": "sha512-LwdZHpScM4Qz8Xw2iKSzS+cfglZzJGvofQICy7W7v4caru4EaAmyUuO6BGrbyQ2mYV11W0U8j5mBhd14dd3B0A==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@babel/helper-string-parser": "^7.27.1",
-        "@babel/helper-validator-identifier": "^7.28.5"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
     "node_modules/@emnapi/core": {
       "version": "1.8.1",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.8.1.tgz",
@@ -1041,15 +802,15 @@
       }
     },
     "node_modules/@next/env": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/env/-/env-16.1.6.tgz",
-      "integrity": "sha512-N1ySLuZjnAtN3kFnwhAwPvZah8RJxKasD7x1f8shFqhncnWZn4JMfg37diLNuoHsLAlrDfM3g4mawVdtAG8XLQ==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/env/-/env-15.5.12.tgz",
+      "integrity": "sha512-pUvdJN1on574wQHjaBfNGDt9Mz5utDSZFsIIQkMzPgNS8ZvT4H2mwOrOIClwsQOb6EGx5M76/CZr6G8i6pSpLg==",
       "license": "MIT"
     },
     "node_modules/@next/eslint-plugin-next": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/eslint-plugin-next/-/eslint-plugin-next-16.1.6.tgz",
-      "integrity": "sha512-/Qq3PTagA6+nYVfryAtQ7/9FEr/6YVyvOtl6rZnGsbReGLf0jZU6gkpr1FuChAQpvV46a78p4cmHOVP8mbfSMQ==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/eslint-plugin-next/-/eslint-plugin-next-15.5.12.tgz",
+      "integrity": "sha512-+ZRSDFTv4aC96aMb5E41rMjysx8ApkryevnvEYZvPZO52KvkqP5rNExLUXJFr9P4s0f3oqNQR6vopCZsPWKDcQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1057,9 +818,9 @@
       }
     },
     "node_modules/@next/swc-darwin-arm64": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-arm64/-/swc-darwin-arm64-16.1.6.tgz",
-      "integrity": "sha512-wTzYulosJr/6nFnqGW7FrG3jfUUlEf8UjGA0/pyypJl42ExdVgC6xJgcXQ+V8QFn6niSG2Pb8+MIG1mZr2vczw==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/swc-darwin-arm64/-/swc-darwin-arm64-15.5.12.tgz",
+      "integrity": "sha512-RnRjBtH8S8eXCpUNkQ+543DUc7ys8y15VxmFU9HRqlo9BG3CcBUiwNtF8SNoi2xvGCVJq1vl2yYq+3oISBS0Zg==",
       "cpu": [
         "arm64"
       ],
@@ -1073,9 +834,9 @@
       }
     },
     "node_modules/@next/swc-darwin-x64": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/swc-darwin-x64/-/swc-darwin-x64-16.1.6.tgz",
-      "integrity": "sha512-BLFPYPDO+MNJsiDWbeVzqvYd4NyuRrEYVB5k2N3JfWncuHAy2IVwMAOlVQDFjj+krkWzhY2apvmekMkfQR0CUQ==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/swc-darwin-x64/-/swc-darwin-x64-15.5.12.tgz",
+      "integrity": "sha512-nqa9/7iQlboF1EFtNhWxQA0rQstmYRSBGxSM6g3GxvxHxcoeqVXfGNr9stJOme674m2V7r4E3+jEhhGvSQhJRA==",
       "cpu": [
         "x64"
       ],
@@ -1089,9 +850,9 @@
       }
     },
     "node_modules/@next/swc-linux-arm64-gnu": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-gnu/-/swc-linux-arm64-gnu-16.1.6.tgz",
-      "integrity": "sha512-OJYkCd5pj/QloBvoEcJ2XiMnlJkRv9idWA/j0ugSuA34gMT6f5b7vOiCQHVRpvStoZUknhl6/UxOXL4OwtdaBw==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-gnu/-/swc-linux-arm64-gnu-15.5.12.tgz",
+      "integrity": "sha512-dCzAjqhDHwmoB2M4eYfVKqXs99QdQxNQVpftvP1eGVppamXh/OkDAwV737Zr0KPXEqRUMN4uCjh6mjO+XtF3Mw==",
       "cpu": [
         "arm64"
       ],
@@ -1105,9 +866,9 @@
       }
     },
     "node_modules/@next/swc-linux-arm64-musl": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-musl/-/swc-linux-arm64-musl-16.1.6.tgz",
-      "integrity": "sha512-S4J2v+8tT3NIO9u2q+S0G5KdvNDjXfAv06OhfOzNDaBn5rw84DGXWndOEB7d5/x852A20sW1M56vhC/tRVbccQ==",
+      "version": "15.5.12",
+      "resolved": "https://registry.npmjs.org/@next/swc-linux-arm64-musl/-/swc-linux-arm64-musl-15.5.12.tgz",
+      "integrity": "sha512-+fpGWvQiITgf7PUtbWY1H7qUSnBZsPPLyyq03QuAKpVoTy/QUx1JptEDTQMVvQhvizCEuNLEeghrQUyXQOekuw==",
       "cpu": [
         "arm64"
       ],
@@ -1121,9 +882,9 @@
       }
     },
     "node_modules/@next/swc-linux-x64-gnu": {
-      "version": "16.1.6",
-      "resolved": "https://registry.npmjs.org/@next/swc-linux-x64-gnu/-/swc-linux-x64-gnu-16.1.6.tgz",
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         "caniuse-lite": "^1.0.30001579",
         "postcss": "8.4.31",
         "styled-jsx": "5.1.6"
@@ -5370,18 +4994,18 @@
         "next": "dist/bin/next"
       },
       "engines": {
-        "node": ">=20.9.0"
+        "node": "^18.18.0 || ^19.8.0 || >= 20.0.0"
       },
       "optionalDependencies": {
-        "@next/swc-darwin-arm64": "16.1.6",
-        "@next/swc-darwin-x64": "16.1.6",
-        "@next/swc-linux-arm64-gnu": "16.1.6",
-        "@next/swc-linux-arm64-musl": "16.1.6",
-        "@next/swc-linux-x64-gnu": "16.1.6",
-        "@next/swc-linux-x64-musl": "16.1.6",
-        "@next/swc-win32-arm64-msvc": "16.1.6",
-        "@next/swc-win32-x64-msvc": "16.1.6",
-        "sharp": "^0.34.4"
+        "@next/swc-darwin-arm64": "15.5.12",
+        "@next/swc-darwin-x64": "15.5.12",
+        "@next/swc-linux-arm64-gnu": "15.5.12",
+        "@next/swc-linux-arm64-musl": "15.5.12",
+        "@next/swc-linux-x64-gnu": "15.5.12",
+        "@next/swc-linux-x64-musl": "15.5.12",
+        "@next/swc-win32-arm64-msvc": "15.5.12",
+        "@next/swc-win32-x64-msvc": "15.5.12",
+        "sharp": "^0.34.3"
       },
       "peerDependencies": {
         "@opentelemetry/api": "^1.1.0",
@@ -5434,13 +5058,6 @@
         "node": "^10 || ^12 || >=14"
       }
     },
-    "node_modules/node-releases": {
-      "version": "2.0.27",
-      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.27.tgz",
-      "integrity": "sha512-nmh3lCkYZ3grZvqcCH+fjmQ7X+H0OeZgP40OierEaAptX4XofMh5kwNbWh7lBduUzCcV/8kZ+NDLCwm2iorIlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/nodemailer": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-7.0.11.tgz",
@@ -5824,24 +5441,28 @@
       "license": "MIT"
     },
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-      "version": "19.2.3",
-      "resolved": "https://registry.npmjs.org/react/-/react-19.2.3.tgz",
-      "integrity": "sha512-Ku/hhYbVjOQnXDZFv2+RibmLFGwFdeeKHFcOTlrt7xplBnya5OGn/hIRDsqDiSUcfORsDC7MPxwork8jBwsIWA==",
+      "version": "18.3.1",
+      "resolved": "https://registry.npmjs.org/react/-/react-18.3.1.tgz",
+      "integrity": "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ==",
       "license": "MIT",
+      "dependencies": {
+        "loose-envify": "^1.1.0"
+      },
       "engines": {
         "node": ">=0.10.0"
       }
     },
     "node_modules/react-dom": {
-      "version": "19.2.3",
-      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-19.2.3.tgz",
-      "integrity": "sha512-yELu4WmLPw5Mr/lmeEpox5rw3RETacE++JgHqQzd2dg+YbJuat3jH4ingc+WPZhxaoFzdv9y33G+F7Nl5O0GBg==",
+      "version": "18.3.1",
+      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.3.1.tgz",
+      "integrity": "sha512-5m4nQKp+rZRb09LNH59GM4BxTh9251/ylbKIbpe7TpGxfJ+9kv6BLkLBXIjjspbgbnIBNqlI23tRnTWT0snUIw==",
       "license": "MIT",
       "dependencies": {
-        "scheduler": "^0.27.0"
+        "loose-envify": "^1.1.0",
+        "scheduler": "^0.23.2"
       },
       "peerDependencies": {
-        "react": "^19.2.3"
+        "react": "^18.3.1"
       }
     },
     "node_modules/react-is": {
@@ -6054,10 +5675,13 @@
       "license": "MIT"
     },
     "node_modules/scheduler": {
-      "version": "0.27.0",
-      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
-      "integrity": "sha512-eNv+WrVbKu1f3vbYJT/xtiF5syA5HPIMtf9IgY/nKg0sWqzAUEvqY/xm7OcZc/qafLx/iO9FgOmeSAp4v5ti/Q==",
-      "license": "MIT"
+      "version": "0.23.2",
+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.2.tgz",
+      "integrity": "sha512-UOShsPwz7NrMUqhR6t0hWjFduvOzbtv7toDH1/hIrfRNIDBnnBWd0CwJTGvTpngVlmwGCdP9/Zl/tVrDqcuYzQ==",
+      "license": "MIT",
+      "dependencies": {
+        "loose-envify": "^1.1.0"
+      }
     },
     "node_modules/selderee": {
       "version": "0.11.0",
@@ -6780,30 +6404,6 @@
         "node": ">=14.17"
       }
     },
-    "node_modules/typescript-eslint": {
-      "version": "8.54.0",
-      "resolved": "https://registry.npmjs.org/typescript-eslint/-/typescript-eslint-8.54.0.tgz",
-      "integrity": "sha512-CKsJ+g53QpsNPqbzUsfKVgd3Lny4yKZ1pP4qN3jdMOg/sisIDLGyDMezycquXLE5JsEU0wp3dGNdzig0/fmSVQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@typescript-eslint/eslint-plugin": "8.54.0",
-        "@typescript-eslint/parser": "8.54.0",
-        "@typescript-eslint/typescript-estree": "8.54.0",
-        "@typescript-eslint/utils": "8.54.0"
-      },
-      "engines": {
-        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/typescript-eslint"
-      },
-      "peerDependencies": {
-        "eslint": "^8.57.0 || ^9.0.0",
-        "typescript": ">=4.8.4 <6.0.0"
-      }
-    },
     "node_modules/uc.micro": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.1.0.tgz",
@@ -6870,37 +6470,6 @@
         "@unrs/resolver-binding-win32-x64-msvc": "1.11.1"
       }
     },
-    "node_modules/update-browserslist-db": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
-      "integrity": "sha512-Js0m9cx+qOgDxo0eMiFGEueWztz+d4+M3rGlmKPT+T4IS/jP4ylw3Nwpu6cpTTP8R1MAC1kF4VbdLt3ARf209w==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "opencollective",
-          "url": "https://opencollective.com/browserslist"
-        },
-        {
-          "type": "tidelift",
-          "url": "https://tidelift.com/funding/github/npm/browserslist"
-        },
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/ai"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "escalade": "^3.2.0",
-        "picocolors": "^1.1.1"
-      },
-      "bin": {
-        "update-browserslist-db": "cli.js"
-      },
-      "peerDependencies": {
-        "browserslist": ">= 4.21.0"
-      }
-    },
     "node_modules/uri-js": {
       "version": "4.4.1",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
@@ -7060,13 +6629,6 @@
         }
       }
     },
-    "node_modules/yallist": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
-      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
-      "dev": true,
-      "license": "ISC"
-    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
@@ -7079,29 +6641,6 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
-    },
-    "node_modules/zod": {
-      "version": "4.3.6",
-      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
-      "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
-      "dev": true,
-      "license": "MIT",
-      "funding": {
-        "url": "https://github.com/sponsors/colinhacks"
-      }
-    },
-    "node_modules/zod-validation-error": {
-      "version": "4.0.2",
-      "resolved": "https://registry.npmjs.org/zod-validation-error/-/zod-validation-error-4.0.2.tgz",
-      "integrity": "sha512-Q6/nZLe6jxuU80qb/4uJ4t5v2VEZ44lzQjPDhYJNztRQ4wyWc6VF3D3Kb/fAuPetZQnhS3hnajCf9CsWesghLQ==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=18.0.0"
-      },
-      "peerDependencies": {
-        "zod": "^3.25.0 || ^4.0.0"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index a83807b..0614490 100644
--- a/package.json
+++ b/package.json
@@ -13,19 +13,20 @@
     "@supabase/ssr": "^0.8.0",
     "@supabase/supabase-js": "^2.95.3",
     "clsx": "^2.1.1",
-    "next": "16.1.6",
-    "react": "19.2.3",
-    "react-dom": "19.2.3",
+    "next": "^15.5.12",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
     "resend": "^6.9.1",
     "stripe": "^20.3.1"
   },
   "devDependencies": {
+    "@eslint/eslintrc": "^3.3.3",
     "@tailwindcss/postcss": "^4",
     "@types/node": "^20",
-    "@types/react": "^19",
-    "@types/react-dom": "^19",
+    "@types/react": "^18.3.28",
+    "@types/react-dom": "^18.3.7",
     "eslint": "^9",
-    "eslint-config-next": "16.1.6",
+    "eslint-config-next": "^15.5.12",
     "tailwindcss": "^4",
     "typescript": "^5"
   }
diff --git a/tsconfig.json b/tsconfig.json
index 3a13f90..7501173 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -11,7 +11,7 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true,
-    "jsx": "react-jsx",
+    "jsx": "preserve",
     "incremental": true,
     "plugins": [
       {
@@ -26,9 +26,7 @@
     "next-env.d.ts",
     "**/*.ts",
     "**/*.tsx",
-    ".next/types/**/*.ts",
-    ".next/dev/types/**/*.ts",
-    "**/*.mts"
+    ".next/types/**/*.ts"
   ],
   "exclude": ["node_modules"]
 }