diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 30fbbb7..762ee75 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.0.0b8
+current_version = 0.0.0b9
 files = bsb_test/__init__.py
 commit = True
 tag = True
diff --git a/bsb_test/__init__.py b/bsb_test/__init__.py
index 103f1b5..a278146 100644
--- a/bsb_test/__init__.py
+++ b/bsb_test/__init__.py
@@ -26,7 +26,7 @@
 )
 from .parallel import *
 
-__version__ = "0.0.0b8"
+__version__ = "0.0.0b9"
 
 
 class NetworkFixture:
diff --git a/bsb_test/configs/__init__.py b/bsb_test/configs/__init__.py
index b59c806..567e242 100644
--- a/bsb_test/configs/__init__.py
+++ b/bsb_test/configs/__init__.py
@@ -3,7 +3,10 @@
 
 
 def get_test_config_module(name: str):
-    return importlib.import_module(f".{name}", package=get_test_config.__module__)
+    try:
+        return importlib.import_module(f".{name}", package=get_test_config.__module__)
+    except Exception as e:
+        raise ValueError(f"'{name}' is not a known test configuration.") from e
 
 
 def get_test_config_tree(name: str):
diff --git a/bsb_test/configs/brunel.py b/bsb_test/configs/brunel.py
index 7213e71..0078d7c 100644
--- a/bsb_test/configs/brunel.py
+++ b/bsb_test/configs/brunel.py
@@ -97,10 +97,8 @@
                     "device": "poisson_generator",
                     "rate": 17789.007714721884,
                     "targetting": {"strategy": "all"},
-                    "$import": {
-                        "ref": "#../../connection_models/excitatory_to_excitatory/synapse",
-                        "values": ["weight", "delay"],
-                    },
+                    "weight": 20.68015524367846,
+                    "delay": 1.5,
                 },
                 "sr_exc": {
                     "device": "spike_recorder",
diff --git a/bsb_test/configs/brunel_wbsb.py b/bsb_test/configs/brunel_wbsb.py
index 88709a3..a3814ca 100644
--- a/bsb_test/configs/brunel_wbsb.py
+++ b/bsb_test/configs/brunel_wbsb.py
@@ -85,10 +85,8 @@
                     "device": "poisson_generator",
                     "rate": 17789.007714721884,
                     "targetting": {"strategy": "all"},
-                    "$import": {
-                        "ref": "#../../connection_models/excitatory_to_excitatory/synapse",
-                        "values": ["weight", "delay"],
-                    },
+                    "weight": 20.68015524367846,
+                    "delay": 1.5,
                 },
                 "sr_exc": {
                     "device": "spike_recorder",