diff --git a/biome.json b/biome.json
index 587892a380..39077df201 100644
--- a/biome.json
+++ b/biome.json
@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",
@@ -11,11 +11,10 @@
     "rules": {
       "recommended": true,
       "style": {
-        "useTemplate": "off"
-      },
-      "nursery": {
+        "useTemplate": "off",
         "noCommonJs": "error"
       },
+      "nursery": {},
       "suspicious": {
         "noAssignInExpressions": "warn"
       },
@@ -27,9 +26,7 @@
       }
     }
   },
-  "organizeImports": {
-    "enabled": true
-  },
+  "assist": { "actions": { "source": { "organizeImports": "on" } } },
   "formatter": {
     "enabled": true,
     "formatWithErrors": false,
@@ -53,30 +50,32 @@
     }
   },
   "files": {
-    "ignore": [
-      ".yarn/**",
-      "tests/analysis_tests/**/src/**",
-      "tests/build_tests/**/src/**",
-      "tests/docstring_tests/**",
-      "tests/gentype_tests/**",
-      "tests/tests/**/src/**",
-      "tests/tools_tests/**/src/**",
-      "analysis/examples/**/src/**",
-      "rewatch/**",
-      "lib/es6/**",
-      "lib/js/**",
-      "lib/bs/**",
-      "playground/**",
-      "*.bs.js",
-      "*.res.js",
-      "*.res.mjs",
-      "*.gen.ts*",
-      "*.d.ts",
-      "*.exe",
-      "package.json",
-      "packages/artifacts.json",
-      ".mypy_cache/**",
-      ".history/**"
+    "includes": [
+      "**",
+      "!**/.yarn",
+      "!**/tests/analysis_tests/**/src",
+      "!**/tests/build_tests/**/src",
+      "!**/tests/docstring_tests",
+      "!**/tests/gentype_tests",
+      "**/tests/gentype_tests/typescript-react-example/**",
+      "!**/tests/tests/**/src",
+      "!**/tests/tools_tests/**/src",
+      "!**/analysis/examples/**/src",
+      "!**/rewatch",
+      "!**/lib/es6",
+      "!**/lib/js",
+      "!**/lib/bs",
+      "!**/playground",
+      "!**/*.bs.js",
+      "!**/*.res.js",
+      "!**/*.res.mjs",
+      "!**/*.gen.ts*",
+      "!**/*.d.ts",
+      "!**/*.exe",
+      "!**/package.json",
+      "!**/packages/artifacts.json",
+      "!**/.mypy_cache",
+      "!**/.history"
     ]
   }
 }
diff --git a/package.json b/package.json
index 92eed3b336..493c16d03a 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "@rescript/win32-x64": "workspace:packages/@rescript/win32-x64"
   },
   "devDependencies": {
-    "@biomejs/biome": "1.9.4",
+    "@biomejs/biome": "2.3.11",
     "@types/node": "^25.0.3",
     "@types/semver": "^7.7.0",
     "@yarnpkg/types": "^4.0.1",
diff --git a/tests/build_tests/weird_deps/input.js b/tests/build_tests/weird_deps/input.js
index 1675283d2e..d98217346b 100644
--- a/tests/build_tests/weird_deps/input.js
+++ b/tests/build_tests/weird_deps/input.js
@@ -2,6 +2,7 @@
 
 import * as assert from "node:assert";
 import { setup } from "#dev/process";
+
 const { execBuild, execClean } = setup(import.meta.dirname);
 
 const out = await execBuild();
diff --git a/tests/gentype_tests/typescript-react-example/Makefile b/tests/gentype_tests/typescript-react-example/Makefile
index 46f6aae7a6..62f0c2e2bf 100644
--- a/tests/gentype_tests/typescript-react-example/Makefile
+++ b/tests/gentype_tests/typescript-react-example/Makefile
@@ -2,7 +2,6 @@ SHELL = /bin/bash
 
 test:
 	yarn build
-	yarn check
 	yarn typecheck
 	@git diff --quiet src/ \
 		|| { echo; echo "Please review the Gentype outputs too!"; echo; false; } \
diff --git a/tests/gentype_tests/typescript-react-example/biome.json b/tests/gentype_tests/typescript-react-example/biome.json
deleted file mode 100644
index f89a93677e..0000000000
--- a/tests/gentype_tests/typescript-react-example/biome.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
-  "extends": ["../../../biome.json"],
-  "linter": {
-    "ignore": ["**/*.res.js", "**/*.gen.ts*"]
-  },
-  "organizeImports": {
-    "ignore": ["**/*.res.js", "**/*.gen.ts*"]
-  },
-  "formatter": {
-    "ignore": ["**/*.res.js", "**/*.gen.ts*"]
-  }
-}
diff --git a/tests/gentype_tests/typescript-react-example/package.json b/tests/gentype_tests/typescript-react-example/package.json
index 689d837361..f8e2d691ad 100644
--- a/tests/gentype_tests/typescript-react-example/package.json
+++ b/tests/gentype_tests/typescript-react-example/package.json
@@ -5,8 +5,7 @@
     "start": "rescript build -w",
     "build": "rescript build",
     "clean": "rescript clean",
-    "typecheck": "tsc",
-    "check": "biome check --changed --no-errors-on-unmatched ."
+    "typecheck": "tsc"
   },
   "dependencies": {
     "@rescript/react": "^0.13.1",
@@ -15,7 +14,6 @@
     "rescript": "workspace:^"
   },
   "devDependencies": {
-    "@biomejs/biome": "1.9.4",
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "typescript": "5.9.3"
diff --git a/yarn.lock b/yarn.lock
index 3a1e8c3e3e..1569da60f1 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -180,18 +180,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@biomejs/biome@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/biome@npm:1.9.4"
-  dependencies:
-    "@biomejs/cli-darwin-arm64": "npm:1.9.4"
-    "@biomejs/cli-darwin-x64": "npm:1.9.4"
-    "@biomejs/cli-linux-arm64": "npm:1.9.4"
-    "@biomejs/cli-linux-arm64-musl": "npm:1.9.4"
-    "@biomejs/cli-linux-x64": "npm:1.9.4"
-    "@biomejs/cli-linux-x64-musl": "npm:1.9.4"
-    "@biomejs/cli-win32-arm64": "npm:1.9.4"
-    "@biomejs/cli-win32-x64": "npm:1.9.4"
+"@biomejs/biome@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/biome@npm:2.3.11"
+  dependencies:
+    "@biomejs/cli-darwin-arm64": "npm:2.3.11"
+    "@biomejs/cli-darwin-x64": "npm:2.3.11"
+    "@biomejs/cli-linux-arm64": "npm:2.3.11"
+    "@biomejs/cli-linux-arm64-musl": "npm:2.3.11"
+    "@biomejs/cli-linux-x64": "npm:2.3.11"
+    "@biomejs/cli-linux-x64-musl": "npm:2.3.11"
+    "@biomejs/cli-win32-arm64": "npm:2.3.11"
+    "@biomejs/cli-win32-x64": "npm:2.3.11"
   dependenciesMeta:
     "@biomejs/cli-darwin-arm64":
       optional: true
@@ -211,62 +211,62 @@ __metadata:
       optional: true
   bin:
     biome: bin/biome
-  checksum: 10c0/b5655c5aed9a6fffe24f7d04f15ba4444389d0e891c9ed9106fab7388ac9b4be63185852cc2a937b22940dac3e550b71032a4afd306925cfea436c33e5646b3e
+  checksum: 10c0/b9764070c3d1583466a8861d37dc480c18103f7bb52115db0f265a38e6343d69792c9beea094e0b3db0905cb365b9a82ad2a0f3f05b7f04873a8f9b444263140
   languageName: node
   linkType: hard
 
-"@biomejs/cli-darwin-arm64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-darwin-arm64@npm:1.9.4"
+"@biomejs/cli-darwin-arm64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-darwin-arm64@npm:2.3.11"
   conditions: os=darwin & cpu=arm64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-darwin-x64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-darwin-x64@npm:1.9.4"
+"@biomejs/cli-darwin-x64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-darwin-x64@npm:2.3.11"
   conditions: os=darwin & cpu=x64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-arm64-musl@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-linux-arm64-musl@npm:1.9.4"
+"@biomejs/cli-linux-arm64-musl@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-linux-arm64-musl@npm:2.3.11"
   conditions: os=linux & cpu=arm64 & libc=musl
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-arm64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-linux-arm64@npm:1.9.4"
+"@biomejs/cli-linux-arm64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-linux-arm64@npm:2.3.11"
   conditions: os=linux & cpu=arm64 & libc=glibc
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-x64-musl@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-linux-x64-musl@npm:1.9.4"
+"@biomejs/cli-linux-x64-musl@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-linux-x64-musl@npm:2.3.11"
   conditions: os=linux & cpu=x64 & libc=musl
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-x64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-linux-x64@npm:1.9.4"
+"@biomejs/cli-linux-x64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-linux-x64@npm:2.3.11"
   conditions: os=linux & cpu=x64 & libc=glibc
   languageName: node
   linkType: hard
 
-"@biomejs/cli-win32-arm64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-win32-arm64@npm:1.9.4"
+"@biomejs/cli-win32-arm64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-win32-arm64@npm:2.3.11"
   conditions: os=win32 & cpu=arm64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-win32-x64@npm:1.9.4":
-  version: 1.9.4
-  resolution: "@biomejs/cli-win32-x64@npm:1.9.4"
+"@biomejs/cli-win32-x64@npm:2.3.11":
+  version: 2.3.11
+  resolution: "@biomejs/cli-win32-x64@npm:2.3.11"
   conditions: os=win32 & cpu=x64
   languageName: node
   linkType: hard
@@ -745,7 +745,6 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@tests/gentype-react-example@workspace:tests/gentype_tests/typescript-react-example"
   dependencies:
-    "@biomejs/biome": "npm:1.9.4"
     "@rescript/react": "npm:^0.13.1"
     "@types/react": "npm:^18.3.3"
     "@types/react-dom": "npm:^18.3.0"
@@ -2459,7 +2458,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "rescript@workspace:."
   dependencies:
-    "@biomejs/biome": "npm:1.9.4"
+    "@biomejs/biome": "npm:2.3.11"
     "@rescript/darwin-arm64": "workspace:packages/@rescript/darwin-arm64"
     "@rescript/darwin-x64": "workspace:packages/@rescript/darwin-x64"
     "@rescript/linux-arm64": "workspace:packages/@rescript/linux-arm64"