diff --git a/.github/workflows/eepp-linux-build-check.yml b/.github/workflows/eepp-linux-build-check.yml
index cde16a6f0..affae954f 100644
--- a/.github/workflows/eepp-linux-build-check.yml
+++ b/.github/workflows/eepp-linux-build-check.yml
@@ -52,12 +52,20 @@ jobs:
 
     - name: Upload development environment
       if: github.event_name == 'push'
-      uses: actions/upload-artifact@v4
-      with:
-        name: eepp-dev-linux-x86_64
-        path: ${{ runner.temp }}/eepp-dev-linux-x86_64.tar.zst
-        retention-days: 5
-        compression-level: 0
+      run: |
+        npm install \
+          --no-save \
+          --no-package-lock \
+          --prefix "$RUNNER_TEMP/eepp-artifact-uploader" \
+          @actions/artifact@6.2.1
+
+        NODE_PATH="$RUNNER_TEMP/eepp-artifact-uploader/node_modules" \
+          node projects/scripts/upload_split_artifact.cjs \
+            "$RUNNER_TEMP/eepp-dev-linux-x86_64.tar.zst" \
+            eepp-dev-linux-x86_64 \
+            400M \
+            5 \
+            8
     - name: Set SDK version
       id: sdk_version
       run: |
diff --git a/projects/scripts/upload_split_artifact.cjs b/projects/scripts/upload_split_artifact.cjs
new file mode 100755
index 000000000..7afb0dcc1
--- /dev/null
+++ b/projects/scripts/upload_split_artifact.cjs
@@ -0,0 +1,106 @@
+#!/usr/bin/env node
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const { pipeline } = require('stream/promises');
+const { DefaultArtifactClient } = require('@actions/artifact');
+
+function parseSize(value) {
+	const match = /^(\d+)([KMG]?)$/i.exec(value);
+	if (!match)
+		throw new Error(`Invalid size '${value}' (expected e.g. 400M)`);
+
+	const multipliers = {
+		'': 1,
+		K: 1024,
+		M: 1024 * 1024,
+		G: 1024 * 1024 * 1024,
+	};
+
+	return Number(match[1]) * multipliers[match[2].toUpperCase()];
+}
+
+async function writeChunk(source, destination, start, end) {
+	await pipeline(
+		fs.createReadStream(source, { start, end }),
+		fs.createWriteStream(destination)
+	);
+}
+
+async function main() {
+	const [
+		archiveArg,
+		artifactPrefix = 'eepp-dev-linux-x86_64',
+		chunkSizeArg = '400M',
+		retentionDaysArg = '5',
+		maxPartsArg = '8',
+	] = process.argv.slice(2);
+
+	if (!archiveArg) {
+		console.error(
+			'Usage: upload_split_artifact.cjs <archive> [artifact-prefix] [chunk-size] [retention-days] [max-parts]'
+		);
+		process.exit(2);
+	}
+
+	const archive = path.resolve(archiveArg);
+	const chunkSize = parseSize(chunkSizeArg);
+	const retentionDays = Number(retentionDaysArg);
+	const maxParts = Number(maxPartsArg);
+	const stat = await fs.promises.stat(archive);
+
+	if (!stat.isFile())
+		throw new Error(`Not a regular file: ${archive}`);
+	if (!Number.isInteger(retentionDays) || retentionDays < 1)
+		throw new Error(`Invalid retention days: ${retentionDaysArg}`);
+	if (!Number.isInteger(maxParts) || maxParts < 1)
+		throw new Error(`Invalid max parts: ${maxPartsArg}`);
+
+	const partCount = Math.ceil(stat.size / chunkSize);
+	if (partCount > maxParts) {
+		throw new Error(
+			`Archive requires ${partCount} artifacts at ${chunkSizeArg} per part, ` +
+			`but the configured maximum is ${maxParts}. Increase the chunk size or artifact budget.`
+		);
+	}
+
+	console.log(
+		`Uploading ${archive} (${stat.size} bytes) as ${partCount} artifact part(s) of at most ${chunkSizeArg}`
+	);
+
+	const artifact = new DefaultArtifactClient();
+	const suffixWidth = Math.max(2, String(partCount - 1).length);
+
+	for (let index = 0; index < partCount; ++index) {
+		const suffix = String(index).padStart(suffixWidth, '0');
+		const partPath = `${archive}.part-${suffix}`;
+		const start = index * chunkSize;
+		const end = Math.min(stat.size, start + chunkSize) - 1;
+		const artifactName = `${artifactPrefix}-part-${suffix}`;
+
+		console.log(
+			`Creating ${path.basename(partPath)} (${start}-${end}, ${end - start + 1} bytes)`
+		);
+		await writeChunk(archive, partPath, start, end);
+
+		try {
+			const { id, size } = await artifact.uploadArtifact(
+				artifactName,
+				[partPath],
+				{
+					retentionDays,
+					compressionLevel: 0,
+				}
+			);
+			console.log(`Uploaded ${artifactName}: id=${id}, size=${size}`);
+		} finally {
+			await fs.promises.rm(partPath, { force: true });
+		}
+	}
+}
+
+main().catch((error) => {
+	console.error(error.stack || error.message || error);
+	process.exit(1);
+});