diff --git a/load_sim_tools.sh b/load_sim_tools.sh
index ca943623953eafee58a73dbfe8ee9be877015fa6..f1755a23d7db4172a4526d9c4023d6fb98dda137 100644
--- a/load_sim_tools.sh
+++ b/load_sim_tools.sh
@@ -16,9 +16,13 @@ spack repo add ebrains-spack-builds
 cd ~
 echo "Loading packages..."
 
-spack load -r python %gcc@10.3.0
-spack load -r py-numpy %gcc@10.3.0
+spack load -r python@3.8.11 %gcc@10.3.0
+spack load -r py-numpy@1.21.0 %gcc@10.3.0
 spack load -r py-pip %gcc@10.3.0
+spack load -r py-scipy %gcc@10.3.0
+spack load -r py-pandas %gcc@10.3.0
+spack load -r py-seaborn %gcc@10.3.0
+spack load -r py-matplotlib %gcc@10.3.0
 spack load -r arbor %gcc@10.3.0
 spack load -r neuron %gcc@10.3.0
 spack load -r nest@3.0 %gcc@10.3.0