diff --git a/packages/testing/package.json b/packages/testing/package.json
index 6a3d7bff4c..11a85e7998 100644
--- a/packages/testing/package.json
+++ b/packages/testing/package.json
@@ -16,17 +16,15 @@
     "build:cjs": "tsc --build tsconfig.json && echo '{ \"type\": \"commonjs\" }' > lib/cjs/package.json",
     "build:esm": "tsc --build tsconfig.esm.json && echo '{ \"type\": \"module\" }' > lib/esm/package.json",
     "build": "npm run build:esm & npm run build:cjs",
-    "lint": "eslint --ext .ts,.js --no-error-on-unmatched-pattern .",
-    "lint-fix": "eslint --fix --ext .ts,.js --no-error-on-unmatched-pattern .",
+    "lint": "biome lint .",
+    "lint:fix": "biome check --write .",
     "prepack": "node ../../.github/scripts/release_patch_package_json.js ."
   },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/aws-powertools/powertools-lambda-typescript.git"
   },
-  "files": [
-    "lib"
-  ],
+  "files": ["lib"],
   "type": "module",
   "exports": {
     ".": {
@@ -66,25 +64,13 @@
         "lib/cjs/resources/TestDynamodbTable.d.ts",
         "lib/esm/resources/TestDynamodbTable.d.ts"
       ],
-      "types": [
-        "lib/cjs/types.d.ts",
-        "lib/esm/types.d.ts"
-      ],
-      "context": [
-        "lib/cjs/context.d.ts",
-        "lib/esm/context.d.ts"
-      ]
+      "types": ["lib/cjs/types.d.ts", "lib/esm/types.d.ts"],
+      "context": ["lib/cjs/context.d.ts", "lib/esm/context.d.ts"]
     }
   },
   "types": "./lib/cjs/index.d.ts",
   "main": "./lib/cjs/index.js",
-  "keywords": [
-    "aws",
-    "lambda",
-    "powertools",
-    "testing",
-    "serverless"
-  ],
+  "keywords": ["aws", "lambda", "powertools", "testing", "serverless"],
   "license": "MIT-0",
   "bugs": {
     "url": "https://github.com/aws-powertools/powertools-lambda-typescript/issues"
diff --git a/packages/testing/src/TestInvocationLogs.ts b/packages/testing/src/TestInvocationLogs.ts
index 106033a180..50bd418327 100644
--- a/packages/testing/src/TestInvocationLogs.ts
+++ b/packages/testing/src/TestInvocationLogs.ts
@@ -85,7 +85,7 @@ class TestInvocationLogs {
         try {
           const parsedLog = TestInvocationLogs.parseFunctionLog(log);
 
-          return parsedLog.level == levelToFilter;
+          return parsedLog.level === levelToFilter;
         } catch (error) {
           // If log is not from structured logging : such as metrics one.
           return (
diff --git a/packages/testing/src/TestStack.ts b/packages/testing/src/TestStack.ts
index 3e5d32da20..ea737d31c1 100644
--- a/packages/testing/src/TestStack.ts
+++ b/packages/testing/src/TestStack.ts
@@ -1,9 +1,9 @@
+import { readFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
-import { readFile } from 'node:fs/promises';
-import { App, Stack } from 'aws-cdk-lib';
 import { AwsCdkCli, RequireApproval } from '@aws-cdk/cli-lib-alpha';
 import type { ICloudAssemblyDirectoryProducer } from '@aws-cdk/cli-lib-alpha';
+import { App, Stack } from 'aws-cdk-lib';
 import { generateTestUniqueName } from './helpers.js';
 import type { TestStackProps } from './types.js';
 
diff --git a/packages/testing/src/constants.ts b/packages/testing/src/constants.ts
index 8fab08bff4..de3c862b9f 100644
--- a/packages/testing/src/constants.ts
+++ b/packages/testing/src/constants.ts
@@ -1,4 +1,4 @@
-import { Runtime, Architecture } from 'aws-cdk-lib/aws-lambda';
+import { Architecture, Runtime } from 'aws-cdk-lib/aws-lambda';
 
 /**
  * The default AWS Lambda runtime to use when none is provided.
diff --git a/packages/testing/src/helpers.ts b/packages/testing/src/helpers.ts
index 10d584d242..5d7891dfd6 100644
--- a/packages/testing/src/helpers.ts
+++ b/packages/testing/src/helpers.ts
@@ -1,9 +1,9 @@
 import { randomUUID } from 'node:crypto';
 import {
-  TEST_RUNTIMES,
-  defaultRuntime,
   TEST_ARCHITECTURES,
+  TEST_RUNTIMES,
   defaultArchitecture,
+  defaultRuntime,
 } from './constants.js';
 
 const isValidRuntimeKey = (
diff --git a/packages/testing/src/invokeTestFunction.ts b/packages/testing/src/invokeTestFunction.ts
index 8ff4099109..a6662188fd 100644
--- a/packages/testing/src/invokeTestFunction.ts
+++ b/packages/testing/src/invokeTestFunction.ts
@@ -26,11 +26,10 @@ const invokeFunctionOnce = async ({
 
   if (result?.LogResult) {
     return new TestInvocationLogs(result?.LogResult);
-  } else {
-    throw new Error(
-      'No LogResult field returned in the response of Lambda invocation. This should not happen.'
-    );
   }
+  throw new Error(
+    'No LogResult field returned in the response of Lambda invocation. This should not happen.'
+  );
 };
 
 /**
@@ -50,11 +49,11 @@ const invokeFunction = async ({
 
   if (payload && Array.isArray(payload) && payload.length !== times) {
     throw new Error(
-      `The payload array must have the same length as the times parameter.`
+      'The payload array must have the same length as the times parameter.'
     );
   }
 
-  if (invocationMode == 'PARALLEL') {
+  if (invocationMode === 'PARALLEL') {
     const invocationPromises = Array.from(
       { length: times },
       () => invokeFunctionOnce
diff --git a/packages/testing/src/resources/TestDynamodbTable.ts b/packages/testing/src/resources/TestDynamodbTable.ts
index 3717f54ad1..6cb3db7379 100644
--- a/packages/testing/src/resources/TestDynamodbTable.ts
+++ b/packages/testing/src/resources/TestDynamodbTable.ts
@@ -1,9 +1,9 @@
+import { randomUUID } from 'node:crypto';
 import { CfnOutput, RemovalPolicy } from 'aws-cdk-lib';
 import { AttributeType, BillingMode, Table } from 'aws-cdk-lib/aws-dynamodb';
-import { randomUUID } from 'node:crypto';
-import { concatenateResourceName } from '../helpers.js';
 import type { TestStack } from '../TestStack.js';
-import type { TestDynamodbTableProps, ExtraTestProps } from '../types.js';
+import { concatenateResourceName } from '../helpers.js';
+import type { ExtraTestProps, TestDynamodbTableProps } from '../types.js';
 
 /**
  * A DynamoDB Table that can be used in tests.
diff --git a/packages/testing/src/resources/TestNodejsFunction.ts b/packages/testing/src/resources/TestNodejsFunction.ts
index 5ce138e53e..66ff703e8b 100644
--- a/packages/testing/src/resources/TestNodejsFunction.ts
+++ b/packages/testing/src/resources/TestNodejsFunction.ts
@@ -1,15 +1,15 @@
+import { randomUUID } from 'node:crypto';
 import { CfnOutput, Duration } from 'aws-cdk-lib';
 import { Tracing } from 'aws-cdk-lib/aws-lambda';
 import { NodejsFunction, OutputFormat } from 'aws-cdk-lib/aws-lambda-nodejs';
 import { RetentionDays } from 'aws-cdk-lib/aws-logs';
-import { randomUUID } from 'node:crypto';
-import { TEST_RUNTIMES, TEST_ARCHITECTURES } from '../constants.js';
+import type { TestStack } from '../TestStack.js';
+import { TEST_ARCHITECTURES, TEST_RUNTIMES } from '../constants.js';
 import {
   concatenateResourceName,
-  getRuntimeKey,
   getArchitectureKey,
+  getRuntimeKey,
 } from '../helpers.js';
-import type { TestStack } from '../TestStack.js';
 import type { ExtraTestProps, TestNodejsFunctionProps } from '../types.js';
 
 /**
diff --git a/packages/testing/src/types.ts b/packages/testing/src/types.ts
index 1732e2d3b6..1aa85effe7 100644
--- a/packages/testing/src/types.ts
+++ b/packages/testing/src/types.ts
@@ -1,7 +1,7 @@
-import type { TableProps, AttributeType } from 'aws-cdk-lib/aws-dynamodb';
-import type { NodejsFunctionProps } from 'aws-cdk-lib/aws-lambda-nodejs';
 import type { App, Stack } from 'aws-cdk-lib';
-import { LogLevel } from './constants.js';
+import type { AttributeType, TableProps } from 'aws-cdk-lib/aws-dynamodb';
+import type { NodejsFunctionProps } from 'aws-cdk-lib/aws-lambda-nodejs';
+import type { LogLevel } from './constants.js';
 
 interface ExtraTestProps {
   /**
diff --git a/packages/testing/tests/tsconfig.json b/packages/testing/tests/tsconfig.json
index 5654b3e15f..45ba862a85 100644
--- a/packages/testing/tests/tsconfig.json
+++ b/packages/testing/tests/tsconfig.json
@@ -1,11 +1,8 @@
 {
-    "extends": "../tsconfig.json",
-    "compilerOptions": {
-        "rootDir": "../",
-        "noEmit": true
-    },
-    "include": [
-        "../src/**/*",
-        "./**/*",
-    ]
-}
\ No newline at end of file
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "../",
+    "noEmit": true
+  },
+  "include": ["../src/**/*", "./**/*"]
+}
diff --git a/packages/testing/tests/unit/TestInvocationLogs.test.ts b/packages/testing/tests/unit/TestInvocationLogs.test.ts
index 33c4e46968..74c84730ce 100644
--- a/packages/testing/tests/unit/TestInvocationLogs.test.ts
+++ b/packages/testing/tests/unit/TestInvocationLogs.test.ts
@@ -4,7 +4,6 @@
  * @group unit/commons/invocationLogs
  *
  */
-
 import { TestInvocationLogs } from '../../src/TestInvocationLogs.js';
 
 const exampleLogs = `START RequestId: c6af9ac6-7b61-11e6-9a41-93e812345678 Version: $LATEST
diff --git a/packages/testing/tsconfig.esm.json b/packages/testing/tsconfig.esm.json
index 123291b0cf..82486b64fa 100644
--- a/packages/testing/tsconfig.esm.json
+++ b/packages/testing/tsconfig.esm.json
@@ -6,7 +6,5 @@
     "rootDir": "./src",
     "tsBuildInfoFile": ".tsbuildinfo/esm.json"
   },
-  "include": [
-    "./src/**/*"
-  ]
-}
\ No newline at end of file
+  "include": ["./src/**/*"]
+}
diff --git a/packages/testing/tsconfig.json b/packages/testing/tsconfig.json
index f216927295..0f0cc593ac 100644
--- a/packages/testing/tsconfig.json
+++ b/packages/testing/tsconfig.json
@@ -1,11 +1,9 @@
 {
-    "extends": "../../tsconfig.json",
-    "compilerOptions": {
-        "outDir": "./lib/cjs",
-        "rootDir": "./src",
-        "tsBuildInfoFile": ".tsbuildinfo/cjs.json"
-    },
-    "include": [
-        "./src/**/*"
-    ],
-}
\ No newline at end of file
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./lib/cjs",
+    "rootDir": "./src",
+    "tsBuildInfoFile": ".tsbuildinfo/cjs.json"
+  },
+  "include": ["./src/**/*"]
+}