diff --git a/pyproject.toml b/pyproject.toml
index edecc9196..3d526f5cc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,6 +49,7 @@ binaryornot = "^0.4.4"
 license-expression = ">=1.0"
 python-debian = "^0.1.38,!=0.1.45,!=0.1.46,!=0.1.47"
 setuptools = "*"
+dataclasses = { version = "^0.8", python = "<3.7" }
 
 [tool.poetry.dev-dependencies]
 Sphinx = ">=4.0.0"