diff --git a/omv/engines/getbrian2.py b/omv/engines/getbrian2.py
index e5c4de8..dc42663 100644
--- a/omv/engines/getbrian2.py
+++ b/omv/engines/getbrian2.py
@@ -5,7 +5,7 @@
 
 def install_brian2(version):
     if not version:
-        version = "2.7.1"
+        version = "2.9.0"
     try:
         pip_install("brian2", version)
         import brian2
diff --git a/omv/engines/getnest.py b/omv/engines/getnest.py
index 6b46388..931fcbd 100644
--- a/omv/engines/getnest.py
+++ b/omv/engines/getnest.py
@@ -8,7 +8,7 @@
 
 def install_nest(version):
     if not version:
-        version = "3.5"
+        version = "3.7"
 
     inform("Installing NEST", indent=2, verbosity=1)
     nestpath = os.path.join(os.environ["HOME"], "nest")
diff --git a/omv/engines/getnrn.py b/omv/engines/getnrn.py
index 4ee83e6..db7260a 100644
--- a/omv/engines/getnrn.py
+++ b/omv/engines/getnrn.py
@@ -10,7 +10,7 @@
 def install_neuron(version):
     if not version:
         if sys.version_info.major == 3:
-            version = "8.2.7"  # for pynn 0.11.0
+            version = "8.2.7"  
         else:
             version = "7.6"
 
diff --git a/utilities/tests/.test.exIzh.jnml.omt b/utilities/tests/.test.exIzh.jnml.omt
index 23dd326..c958e7b 100644
--- a/utilities/tests/.test.exIzh.jnml.omt
+++ b/utilities/tests/.test.exIzh.jnml.omt
@@ -13,4 +13,4 @@ experiments:
           scaling: [1000, 1000]
         spike detection: 
           method: threshold
-        tolerance: 0.000051
+        tolerance: 5.0862371508887715e-05
diff --git a/utilities/tests/.test.exIzh.jnmleden.omt b/utilities/tests/.test.exIzh.jnmleden.omt
index 0d32d25..59ed240 100644
--- a/utilities/tests/.test.exIzh.jnmleden.omt
+++ b/utilities/tests/.test.exIzh.jnmleden.omt
@@ -13,4 +13,4 @@ experiments:
           scaling: [1000, 1000]
         spike detection:
           method: threshold
-        tolerance: 0.00014888369126089628
+        tolerance: 0.00014884116521364865