diff --git a/pyproject.toml b/pyproject.toml
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,11 @@ jsonschema = "^4.6.0"
 tweepy = "^4.10.0"
 
 [tool.poetry.dev-dependencies]
+vermin = "^1.4.0"
+mypy = "^0.971"
+black = "^22.6.0"
+isort = "^5.10.1"
+types-setuptools = "^63.2.0"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]