diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..030fdbc
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+# Ignore all test and documentation with "export-ignore".
+/.gitattributes     export-ignore
+/.gitignore         export-ignore
+/.travis.yml        export-ignore
+/phpunit.xml        export-ignore
+/Tests              export-ignore
diff --git a/composer.json b/composer.json
index 7d813cb..be169f6 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "require-dev": {
         "phpunit/phpunit": "^7.5|^8.0",
         "symfony/phpunit-bridge": "^5.0",
-        "symfony/property-access": "^3.4|^4.4",
+        "symfony/property-access": "^3.4|^4.4|^5.0",
         "matthiasnoback/symfony-dependency-injection-test": "^3.1|^4.1"
     },
     "suggest": {