diff --git a/Project.toml b/Project.toml
index ee07da8f0..677ed7243 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,6 +15,7 @@ BitBasis = "0.6"
 YaoArrayRegister = "~0.5"
 YaoBase = "~0.11.0, 0.12"
 YaoBlocks = "~0.7"
+YaoSym = "0.2"
 julia = "^1.0.0"
 
 [extras]