diff --git a/tox.ini b/tox.ini
index 945a8ad..7d2e2a0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,7 +29,9 @@ deps =
 commands = {env:_PYTEST_CMD:pytest} {env:_PYTEST_MORE_ARGS:} {posargs:-vvl}
 
 [testenv:mypy]
-deps = poetry
+deps =
+  poetry
+  poetry-plugin-export
 allowlist_externals = sh
 commands_pre =
     sh -c "\