diff --git a/vagrant/misc/etc/default/celeryd b/vagrant/misc/etc/default/celeryd
index 7882ce5..2acf9b3 100644
--- a/vagrant/misc/etc/default/celeryd
+++ b/vagrant/misc/etc/default/celeryd
@@ -11,7 +11,7 @@ CELERY_APP="colab"
 CELERYD_CHDIR="/vagrant/"
 
 # Extra command-line arguments to the worker
-CELERYD_OPTS="--time-limit=300 --concurrency=8"
+CELERYD_OPTS="--time-limit=300 --concurrency=2"
 
 # %N will be replaced with the first part of the nodename.
 CELERYD_LOG_FILE="/var/log/celery/%N.log"
--
libgit2 0.21.2