diff --git a/tox.ini b/tox.ini
index 3fac6713..b9bffa5b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -118,12 +118,14 @@ ignore = E731,H405
 exclude =  .venv,.git,.tox,dist,*lib/python*,*egg,build,releasenotes,doc,alembic/versions
 
 [testenv:docs]
+basepython = python3
 deps =
   -r{toxinidir}/doc/requirements.txt
 commands =
   {toxinidir}/tools/build-docs.sh
 
 [testenv:releasenotes]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build