diff --git a/phpunit.xml b/phpunit.xml
index e7f0a48..07eb6ef 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -19,6 +19,7 @@
     </source>
     <php>
         <env name="APP_ENV" value="testing"/>
+        <env name="APP_KEY" value="base64:4Ptb91NBsGWQmvFU/5KD+BsS9+JYbpjRG+I6SRQNDtM="/>
         <env name="APP_MAINTENANCE_DRIVER" value="file"/>
         <env name="BCRYPT_ROUNDS" value="4"/>
         <env name="BROADCAST_CONNECTION" value="null"/>