diff --git a/phpunit.xml b/phpunit.xml
index c9e326b6..75cc9e2c 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -24,6 +24,7 @@
     </filter>
     <php>
         <env name="APP_ENV" value="testing"/>
+        <env name="APP_KEY" value="base64:FQH+yWnhFyB+2gpByIg2Rybmqn5EXkL7VeFawzSJ/Lc="/>
         <env name="BCRYPT_ROUNDS" value="4"/>
         <env name="CACHE_DRIVER" value="array"/>
         <env name="SESSION_DRIVER" value="array"/>