diff --git a/pyproject.toml b/pyproject.toml
index 8de1656..703281e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,12 +9,12 @@ python = "^3.8"
 requests = "^2.27.1"
 pandas = "^1.4.3"
 
-# TODO: add mock
 [tool.poetry.dev-dependencies]
 bandit = "^1.7.4"
 black = "^22.3.0"
 flake8-docstrings = "^1.6.0"
 isort = "^5.10.1"
+mock = "^4.0.3"
 mypy = "^0.942"
 pdoc3 = "^0.10.0"
 pre-commit = "^2.18.1"