diff --git a/Cargo.toml b/Cargo.toml
index e521a86..9662e8e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,6 @@ members = [
     "r621",
     "r621cli"
 ]
-resolver = "3"
+resolver = "2"