diff --git a/tox.ini b/tox.ini
index 4f58a62..99e71db 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,6 +26,11 @@
        lfdocs-conf
 commands = sphinx-build -W -b linkcheck -d {envtmpdir}/doctrees ./docs/ {toxinidir}/docs/_build/linkcheck
 
+[testenv:clm]
+# use pip to report dependencies with versions
+whitelist_externals = sh
+commands = sh -c 'pip freeze > requirements.txt'
+
 [testenv:code]
 basepython = python3
 deps=