diff --git a/.ci_support/environment-old.yml b/.ci_support/environment-old.yml
index a2fc3f4..60a88a1 100644
--- a/.ci_support/environment-old.yml
+++ b/.ci_support/environment-old.yml
@@ -1,10 +1,10 @@
 channels:
-  - conda-forge
+- conda-forge
 dependencies:
-  - lammps =2022.06.23
-  - openmpi
-  - numpy =1.23.5
-  - mpi4py =3.1.4
-  - pympipool =0.7.0
-  - ase =3.20.1
-  - scipy =1.9.3
+- lammps =2022.06.23
+- openmpi
+- numpy =1.23.5
+- mpi4py =3.1.4
+- pympipool =0.7.0
+- ase =3.20.1
+- scipy =1.9.3