diff --git a/spack.yaml b/spack.yaml
index c76f680794d209c66ac7c010cef3a23e9f696078..08f3acdd7c260bd60eb1ce8448dbb37ee5140a17 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -15,6 +15,7 @@ spack:
     - py-seaborn
     - py-matplotlib
     - py-nameparser
+    - py-lazyarray
     #- py-version-query
     # EBRAINS simulators
     - nest@3.3 +python +gsl +mpi