diff --git a/tox.ini b/tox.ini
index 3459c10ae24..1f5fb075bf3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -90,6 +90,7 @@ passenv = FAST8_NUM_COMMITS
 [testenv:pylint]
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+       isort==4.3.21
        pylint==2.3.0
 commands =
   bash ./tools/coding-checks.sh --pylint {posargs}