diff --git a/pyproject.toml b/pyproject.toml
index 80a0284..72de051 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,6 +15,13 @@ dependencies = [
 	"py-scopes",
 ]
 
+[project.optional-dependencies]
+office = [
+	"oooenv",
+	"ooo-dev-tools",
+]
+test = ["zope.testrunner"]
+
 [tool.setuptools]
 packages = ["scopes.office"]