diff --git a/bin/slurm_calibrate.sh b/bin/slurm_calibrate.sh
index 9f54463439b4f32676afe5c91073cd048ec3005e..0a9d2d7133af40623ff3ff2824d4bb8d1b75023e 100755
--- a/bin/slurm_calibrate.sh
+++ b/bin/slurm_calibrate.sh
@@ -40,7 +40,7 @@ export MPLBACKEND=AGG
 if [ "${uuid}" != "NO_CLUSTER" ]
 then
     ${python_path} -m IPython profile create ${uuid} --parallel
-    ${python_path} -m ipyparallel.cluster start --n=${cluster_cores} --profile=${uuid} --daemon &
+    ${python_path} -m ipyparallel.cluster start --n=${cluster_cores} --profile=${uuid} --daemonize &
     sleep 15
 fi
 
diff --git a/requirements.txt b/requirements.txt
index 95a8594415cd0b3f5f3f5596bf4aacf1b18b5233..76a713f32e287b96e697f3b4a5022792ac01ed60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -36,5 +36,6 @@ scikit-learn == 0.22.2.post1
 sharedmem == 0.3.7 
 sphinx == 1.8.5
 tabulate == 0.8.6
+traitlets == 4.3.3
 unittest-xml-reporting == 3.0.2
 .