diff --git a/pyproject.toml b/pyproject.toml
index 42979e0e1..a6d900139 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -75,7 +75,10 @@ dependencies = [
 	"rq>=1.13.0",
 	"django-rq",
 	# Sieve
-	"sievelib>=1.4.1"
+	"sievelib>=1.4.1",
+        # User
+        "vobject",
+        "caldav==1.3.9"
 ]
 [project.optional-dependencies]
 dev = [