diff --git a/Cargo.toml b/Cargo.toml
index 00fe95b2..8c62f650 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,5 @@
 [workspace]
-resolver = "3"
+resolver = "2"
 members = [
     "algo", 
     "cli",