diff --git a/mpie_cmti/environment.yml b/mpie_cmti/environment.yml
index 515f2fbb..bf09eaf4 100644
--- a/mpie_cmti/environment.yml
+++ b/mpie_cmti/environment.yml
@@ -3,6 +3,7 @@ channels:
 - nodefaults
 dependencies:
 - aimsgb =1.1.1
+- assyst =0.8.1
 - atomicrex =1.0.4
 - bader =1.0.5
 - bokeh =3.8.0
diff --git a/requirements.txt b/requirements.txt
index bd76c547..164405c9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,3 +33,4 @@ netcdf4==1.7.2
 bokeh==3.8.0
 dscribe==2.1.2
 landau==1.4
+assyst=0.8.1