diff --git a/pyproject.toml b/pyproject.toml
index f64a381..b5efbc6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,6 +37,7 @@ yaml = [
     "PyYAML",
 ]
 dev = [
+    "build",
     "cogapp",
     "mypy",
     "pytest",