diff --git a/README.md b/README.md
index 8d0666d6..80d8954e 100644
--- a/README.md
+++ b/README.md
@@ -12,15 +12,16 @@ This action requires that you set the [`CC_TEST_REPORTER_ID`](https://docs.codec
 
 ### Inputs
 
-| Input               | Default         | Description                                                                        |
-| ------------------- | --------------- | ---------------------------------------------------------------------------------- |
-| `coverageCommand`   |                 | The actual command that should be executed to run your tests and capture coverage. |
-| `workingDirectory`  |                 | Specify a custom working directory where the coverage command should be executed.  |
-| `debug`             | `false`         | Enable Code Coverage debug output when set to `true`.                              |
-| `coverageLocations` |                 | Locations to find code coverage as a multiline string.<br>Each line should be of the form `<location>:<type>`.<br>`type` can be any one of `clover, cobertura, coverage.py, excoveralls, gcov, gocov, jacoco, lcov, lcov-json, simplecov, xccov`. See examples below. |
-| `prefix`            | `undefined`     | See [`--prefix`](https://docs.codeclimate.com/docs/configuring-test-coverage)      |
-| `verifyDownload`    | `true`          | Verifies the downloaded Code Climate reporter binary's checksum and GPG signature. See [Verifying binaries](https://github.com/codeclimate/test-reporter#verifying-binaries)      |
-| `verifyEnvironment` | `true`          | Verifies the current runtime environment (operating system and CPU architecture) is supported by the Code Climate reporter. See [list of supported platforms](https://github.com/codeclimate/test-reporter#binaries)      |
+| Input               | Default     | Description                                                                                                                                                                                                                                                           |
+|---------------------|-------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `coverageCommand`   |             | The actual command that should be executed to run your tests and capture coverage.                                                                                                                                                                                    |
+| `workingDirectory`  |             | Specify a custom working directory where the coverage command should be executed.                                                                                                                                                                                     |
+| `debug`             | `false`     | Enable Code Coverage debug output when set to `true`.                                                                                                                                                                                                                 |
+| `coverageLocations` |             | Locations to find code coverage as a multiline string.<br>Each line should be of the form `<location>:<type>`.<br>`type` can be any one of `clover, cobertura, coverage.py, excoveralls, gcov, gocov, jacoco, lcov, lcov-json, simplecov, xccov`. See examples below. |
+| `prefix`            | `undefined` | See [`--prefix`](https://docs.codeclimate.com/docs/configuring-test-coverage)                                                                                                                                                                                         |
+| `verifyDownload`    | `true`      | Verifies the downloaded Code Climate reporter binary's checksum and GPG signature. See [Verifying binaries](https://github.com/codeclimate/test-reporter#verifying-binaries)                                                                                          |
+| `verifyEnvironment` | `true`      | Verifies the current runtime environment (operating system and CPU architecture) is supported by the Code Climate reporter. See [list of supported platforms](https://github.com/codeclimate/test-reporter#binaries)                                                  |
+| `batchSize`         |             | Batch size for source files (cc-test-reporter upload-coverage uses 500 by default)                                                                                                                                                                                    |
 
 > **Note**
 > If you are a Ruby developer using [SimpleCov](https://github.com/simplecov-ruby/simplecov), other users have recommended installing an additional gem – `gem "simplecov_json_formatter"` – this gem fixes `json` error from the default `coverage/.resultset.json` output from SimpleCov.
diff --git a/action.yml b/action.yml
index 87eafae6..8a44a29f 100644
--- a/action.yml
+++ b/action.yml
@@ -33,6 +33,10 @@ inputs:
     required: false
     description: 'Verify that the Action environment (OS and CPU architecture) is supported by Code Climate test reporter'
     default: 'true'
+  batchSize:
+    required: false
+    description: 'Batch size for source files (cc-test-reporter upload-coverage uses 500 by default)'
+    default: ''
 runs:
   using: 'node20'
   main: 'lib/main.mjs'
diff --git a/src/main.ts b/src/main.ts
index 4e21012f..d0f4afe5 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -38,6 +38,8 @@ export interface ActionArguments {
 	verifyDownload?: string;
 	/** Verifies if the current OS and CPU architecture is supported by CodeClimate test reporter. */
 	verifyEnvironment?: string;
+	/** Batch size for source files used by upload-coverage command (default 500) */
+	batchSize?: string;
 }
 
 const CURRENT_ENVIRONMENT = getSupportedEnvironmentInfo();
@@ -209,6 +211,7 @@ export async function run({
 	coveragePrefix,
 	verifyDownload = DEFAULT_VERIFY_DOWNLOAD,
 	verifyEnvironment = DEFAULT_VERIFY_ENVIRONMENT,
+	batchSize,
 }: ActionArguments = {}): Promise<void> {
 	let lastExitCode = 1;
 	if (verifyEnvironment === 'true') {
@@ -368,6 +371,9 @@ export async function run({
 		// Upload to Code Climate.
 		const uploadCommands = ['upload-coverage', '-i', 'coverage.total.json'];
 		if (codeClimateDebug === 'true') uploadCommands.push('--debug');
+		if (batchSize) {
+			uploadCommands.push('--batch-size', batchSize);
+		}
 		try {
 			lastExitCode = await exec(executable, uploadCommands, execOpts);
 			if (lastExitCode !== 0) {
@@ -432,6 +438,7 @@ if (isThisFileBeingRunViaCLI) {
 		'verifyEnvironment',
 		DEFAULT_VERIFY_ENVIRONMENT,
 	);
+	const batchSize = getOptionalString('batchSize');
 
 	try {
 		run({
@@ -444,6 +451,7 @@ if (isThisFileBeingRunViaCLI) {
 			coveragePrefix,
 			verifyDownload,
 			verifyEnvironment,
+			batchSize,
 		});
 	} finally {
 		// Finally clean up all artifacts that we downloaded.
diff --git a/test/main.test.ts b/test/main.test.ts
index c3a1974f..54e888a8 100644
--- a/test/main.test.ts
+++ b/test/main.test.ts
@@ -183,6 +183,7 @@ t.test('🧪 run() should run the CC reporter (happy path).', async (t) => {
 			coverageCommand: `${ECHO_CMD} 'coverage ok'`,
 			verifyDownload: 'false',
 			verifyEnvironment: 'false',
+			batchSize: '200',
 		});
 		stdHook.unhook();
 	} catch (err) {