diff --git a/.travis.yml b/.travis.yml
index ec2205eb718..62d04901e17 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -82,7 +82,7 @@ before_install:
 
 install:
 - |
-  echo "Updating Composer"
+  echo "Updating Composer (version 2.5 is bugged and generate phpunit error Exception: Serialization of 'Closure' is not allowed)"
   rm $TRAVIS_BUILD_DIR/composer.json
   rm $TRAVIS_BUILD_DIR/composer.lock
   composer -V