diff --git a/tox.ini b/tox.ini
index 0a286bf..0aaf152 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,6 +42,11 @@
 [flake8]
 extend-ignore = E501,E741,E731
 
+[testenv:clm]
+# use pip to gather dependencies with versions for CLM analysis
+whitelist_externals = sh
+commands = sh -c 'pip freeze > clm.txt'
+
 # doc jobs
 [testenv:docs]
 whitelist_externals = echo