diff --git a/pyproject.toml b/pyproject.toml
index bfb6d45..9e97e22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,12 @@ nest = "bsb_nest"
 
 [project.optional-dependencies]
 parallel = ["bsb-core[parallel]"]
-test = ["bsb-test>=0.0.0b9,<=0.0.0b9999", "coverage~=7.0", "bsb-hdf5>=1.0.0b0", "bsb-arbor==0.0.0b1"]
+test = [
+    "bsb-test>=0.0.0b9,<=0.0.0b9999",
+    "coverage~=7.0",
+    "bsb-hdf5>=1.0.0b0",
+    # Required to load the Brunel config file
+    "bsb-arbor==0.0.0b1"]
 dev = [
     "pre-commit~=3.5",
     "black~=24.1.1",
@@ -29,4 +34,4 @@ dev = [
 
 [tool.isort]
 profile = "black"
-known_third_party = ["nest"]
\ No newline at end of file
+known_third_party = ["nest"]