diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..795ca2c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,12 @@
+# Pollora harness (QA-06): development files stay out of the archive Composer downloads
+/.claude export-ignore
+/.gitattributes export-ignore
+/.github export-ignore
+/.gitignore export-ignore
+/.harness.json export-ignore
+/AGENTS.md export-ignore
+/api-surface.json export-ignore
+/phpstan.neon export-ignore
+/phpunit.xml export-ignore
+/rector.php export-ignore
+/tests export-ignore
diff --git a/.github/workflows/harness.yml b/.github/workflows/harness.yml
index 2c6db3d..0164122 100644
--- a/.github/workflows/harness.yml
+++ b/.github/workflows/harness.yml
@@ -14,6 +14,6 @@ permissions: {}
 
 jobs:
   harness:
-    uses: Pollora/harness/.github/workflows/php-package.yml@v0.1.11
+    uses: Pollora/harness/.github/workflows/php-package.yml@v0.1.15
     permissions:
       contents: read
diff --git a/composer.json b/composer.json
index 0c9b6c3..69bcb48 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "require-dev": {
         "laravel/pint": "^1.30",
         "pestphp/pest": "^3.8",
-        "pollora/harness": "^0.1.11"
+        "pollora/harness": "^0.1.15"
     },
     "config": {
         "allow-plugins": {