diff --git a/biome.json b/biome.json
index c8ebc01b..1ce7e159 100644
--- a/biome.json
+++ b/biome.json
@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/1.8.3/schema.json",
+  "$schema": "https://biomejs.dev/schemas/1.9.0/schema.json",
   "files": {
     "ignore": [".tsimp", ".yarn", "coverage", "dist", ".pnp.cjs", ".pnp.loader.mjs"]
   },
@@ -23,10 +23,6 @@
   },
   "css": {
     "formatter": {
-      "enabled": true,
-      "indentStyle": "space",
-      "indentWidth": 2,
-      "lineWidth": 100,
       "quoteStyle": "single"
     }
   },
diff --git a/packages/react-calendar/package.json b/packages/react-calendar/package.json
index 5764e9ad..e383ff39 100644
--- a/packages/react-calendar/package.json
+++ b/packages/react-calendar/package.json
@@ -52,7 +52,7 @@
     "warning": "^4.0.0"
   },
   "devDependencies": {
-    "@biomejs/biome": "1.8.3",
+    "@biomejs/biome": "1.9.0",
     "@testing-library/dom": "^10.0.0",
     "@testing-library/jest-dom": "^6.0.0",
     "@testing-library/react": "^16.0.0",
diff --git a/test/MaxDetailOptions.tsx b/test/MaxDetailOptions.tsx
index 3c74b510..bf9043ef 100644
--- a/test/MaxDetailOptions.tsx
+++ b/test/MaxDetailOptions.tsx
@@ -40,6 +40,7 @@ export default function MaxDetailOptions({
             type="radio"
             value={view}
           />
+          {/* biome-ignore lint/a11y/noLabelWithoutControl: Pinky promise this label won't ever be empty */}
           <label htmlFor={`max-${view}`}>{upperCaseFirstLetter(view)}</label>
         </div>
       ))}
diff --git a/test/MinDetailOptions.tsx b/test/MinDetailOptions.tsx
index ca926286..962f28e1 100644
--- a/test/MinDetailOptions.tsx
+++ b/test/MinDetailOptions.tsx
@@ -40,6 +40,7 @@ export default function MinDetailOptions({
             type="radio"
             value={view}
           />
+          {/* biome-ignore lint/a11y/noLabelWithoutControl: Pinky promise this label won't ever be empty */}
           <label htmlFor={`min-${view}`}>{upperCaseFirstLetter(view)}</label>
         </div>
       ))}
diff --git a/test/ViewOptions.tsx b/test/ViewOptions.tsx
index 1a0acdcc..a1cb2b67 100644
--- a/test/ViewOptions.tsx
+++ b/test/ViewOptions.tsx
@@ -95,7 +95,7 @@ export default function ViewOptions({
           onChange={onShowNeighboringCenturyChange}
           type="checkbox"
         />
-        <label htmlFor="showNeighboringCentury">{"Show neighboring century's decades"}</label>
+        <label htmlFor="showNeighboringCentury">Show neighboring century's decades</label>
       </div>
 
       <div>
@@ -105,7 +105,7 @@ export default function ViewOptions({
           onChange={onShowNeighboringDecadeChange}
           type="checkbox"
         />
-        <label htmlFor="showNeighboringDecade">{"Show neighboring decade's years"}</label>
+        <label htmlFor="showNeighboringDecade">Show neighboring decade's years</label>
       </div>
 
       <div>
@@ -116,7 +116,7 @@ export default function ViewOptions({
           onChange={onShowNeighboringMonthChange}
           type="checkbox"
         />
-        <label htmlFor="showNeighboringMonth">{"Show neighboring month's days"}</label>
+        <label htmlFor="showNeighboringMonth">Show neighboring month's days</label>
       </div>
 
       <div>
diff --git a/test/package.json b/test/package.json
index e0c81f5a..1e93bf5a 100644
--- a/test/package.json
+++ b/test/package.json
@@ -26,7 +26,7 @@
     "react-dom": "^18.2.0"
   },
   "devDependencies": {
-    "@biomejs/biome": "1.8.3",
+    "@biomejs/biome": "1.9.0",
     "@types/react": "*",
     "@vitejs/plugin-react": "^4.2.0",
     "typescript": "^5.5.2",
diff --git a/yarn.lock b/yarn.lock
index 91fc0eb9..15007add 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -285,18 +285,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@biomejs/biome@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/biome@npm:1.8.3"
-  dependencies:
-    "@biomejs/cli-darwin-arm64": "npm:1.8.3"
-    "@biomejs/cli-darwin-x64": "npm:1.8.3"
-    "@biomejs/cli-linux-arm64": "npm:1.8.3"
-    "@biomejs/cli-linux-arm64-musl": "npm:1.8.3"
-    "@biomejs/cli-linux-x64": "npm:1.8.3"
-    "@biomejs/cli-linux-x64-musl": "npm:1.8.3"
-    "@biomejs/cli-win32-arm64": "npm:1.8.3"
-    "@biomejs/cli-win32-x64": "npm:1.8.3"
+"@biomejs/biome@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/biome@npm:1.9.0"
+  dependencies:
+    "@biomejs/cli-darwin-arm64": "npm:1.9.0"
+    "@biomejs/cli-darwin-x64": "npm:1.9.0"
+    "@biomejs/cli-linux-arm64": "npm:1.9.0"
+    "@biomejs/cli-linux-arm64-musl": "npm:1.9.0"
+    "@biomejs/cli-linux-x64": "npm:1.9.0"
+    "@biomejs/cli-linux-x64-musl": "npm:1.9.0"
+    "@biomejs/cli-win32-arm64": "npm:1.9.0"
+    "@biomejs/cli-win32-x64": "npm:1.9.0"
   dependenciesMeta:
     "@biomejs/cli-darwin-arm64":
       optional: true
@@ -316,62 +316,62 @@ __metadata:
       optional: true
   bin:
     biome: bin/biome
-  checksum: 10c0/95fe99ce82cd8242f1be51cbf3ac26043b253f5a369d3dc24df09bdb32ec04dba679b1d4fa8b9d602b1bf2c30ecd80af14aa8f5c92d6e0cd6214a99a1099a65b
+  checksum: 10c0/b07ad2c8dc3d52c0a4eea37f98d36399b33a13759903aa65f9678db916810b773fe94937c304899158479bccd8c3c90f0f30af22b34d6dc5963774f1acc5e245
   languageName: node
   linkType: hard
 
-"@biomejs/cli-darwin-arm64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-darwin-arm64@npm:1.8.3"
+"@biomejs/cli-darwin-arm64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-darwin-arm64@npm:1.9.0"
   conditions: os=darwin & cpu=arm64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-darwin-x64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-darwin-x64@npm:1.8.3"
+"@biomejs/cli-darwin-x64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-darwin-x64@npm:1.9.0"
   conditions: os=darwin & cpu=x64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-arm64-musl@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-linux-arm64-musl@npm:1.8.3"
+"@biomejs/cli-linux-arm64-musl@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-linux-arm64-musl@npm:1.9.0"
   conditions: os=linux & cpu=arm64 & libc=musl
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-arm64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-linux-arm64@npm:1.8.3"
+"@biomejs/cli-linux-arm64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-linux-arm64@npm:1.9.0"
   conditions: os=linux & cpu=arm64 & libc=glibc
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-x64-musl@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-linux-x64-musl@npm:1.8.3"
+"@biomejs/cli-linux-x64-musl@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-linux-x64-musl@npm:1.9.0"
   conditions: os=linux & cpu=x64 & libc=musl
   languageName: node
   linkType: hard
 
-"@biomejs/cli-linux-x64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-linux-x64@npm:1.8.3"
+"@biomejs/cli-linux-x64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-linux-x64@npm:1.9.0"
   conditions: os=linux & cpu=x64 & libc=glibc
   languageName: node
   linkType: hard
 
-"@biomejs/cli-win32-arm64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-win32-arm64@npm:1.8.3"
+"@biomejs/cli-win32-arm64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-win32-arm64@npm:1.9.0"
   conditions: os=win32 & cpu=arm64
   languageName: node
   linkType: hard
 
-"@biomejs/cli-win32-x64@npm:1.8.3":
-  version: 1.8.3
-  resolution: "@biomejs/cli-win32-x64@npm:1.8.3"
+"@biomejs/cli-win32-x64@npm:1.9.0":
+  version: 1.9.0
+  resolution: "@biomejs/cli-win32-x64@npm:1.9.0"
   conditions: os=win32 & cpu=x64
   languageName: node
   linkType: hard
@@ -2559,7 +2559,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "react-calendar@workspace:packages/react-calendar"
   dependencies:
-    "@biomejs/biome": "npm:1.8.3"
+    "@biomejs/biome": "npm:1.9.0"
     "@testing-library/dom": "npm:^10.0.0"
     "@testing-library/jest-dom": "npm:^6.0.0"
     "@testing-library/react": "npm:^16.0.0"
@@ -2963,7 +2963,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "test@workspace:test"
   dependencies:
-    "@biomejs/biome": "npm:1.8.3"
+    "@biomejs/biome": "npm:1.9.0"
     "@types/react": "npm:*"
     "@vitejs/plugin-react": "npm:^4.2.0"
     "@wojtekmaj/date-utils": "npm:^1.1.3"