diff --git a/phpunit.xml b/phpunit.xml
index 61c031c..1585708 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -19,6 +19,7 @@
     </source>
     <php>
         <env name="APP_ENV" value="testing"/>
+        <env name="APP_KEY" value="base64:dGVzdGluZ2tleXRoYXRpczMyYnl0ZXNsb25nMTIzNA=="/>
         <env name="APP_MAINTENANCE_DRIVER" value="file"/>
         <env name="BCRYPT_ROUNDS" value="4"/>
         <env name="CACHE_STORE" value="array"/>