diff --git a/load_sim_tools.sh b/load_sim_tools.sh
index ba94b15751cebf0be1ba2cf809e47e0a19e95691..56d5ed6f61819df82bc9bd566eacbd5270467d21 100644
--- a/load_sim_tools.sh
+++ b/load_sim_tools.sh
@@ -11,6 +11,9 @@ echo "Setting up environment..."
 cp -r /srv/test-build/spack/.spack ~
 source /srv/test-build/spack/share/spack/setup-env.sh
 
+cd /srv/$ENV
+spack repo add ebrains-spack-builds
+
 echo "Loading packages..."
 
 spack load -r python %gcc@10.3.0
@@ -18,7 +21,7 @@ spack load -r py-numpy %gcc@10.3.0
 spack load -r py-pip %gcc@10.3.0
 spack load -r arbor %gcc@10.3.0
 spack load -r neuron %gcc@10.3.0
-spack load -r nest %gcc@10.3.0
+spack load -r nest@2.20.0 %gcc@10.3.0
 
 echo "Everything ready!"
 #echo "Starting Python..."