diff --git a/applications/jupyterlab/requirements.txt b/applications/jupyterlab/requirements.txt
index 5fd4862f..5af1ec99 100644
--- a/applications/jupyterlab/requirements.txt
+++ b/applications/jupyterlab/requirements.txt
@@ -3,7 +3,7 @@ pyelectro
 git+https://github.com/NeuralEnsemble/neurotune.git
 
 ####  NEURON & NetPyNE
-neuron
+neuron==8.1
 
 # Install specific version of NetPyNE
 git+https://github.com/Neurosim-lab/netpyne.git@osbv2#egg=netpyne
@@ -11,14 +11,17 @@ git+https://github.com/Neurosim-lab/netpyne.git@osbv2#egg=netpyne
 ####  Other simulators
 
 # Arbor
-arbor
+arbor==0.6.0
+
+# EDEN
+eden-simulator==0.2.1
 
 # Brian
 brian2
 brian2tools
 
 # PyNN
-pynn==0.10.0
+pynn==0.10.1
 
 # elephant
 elephant