diff --git a/Project.toml b/Project.toml
index 1efa5498..f1a7ffd9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,12 @@ YaoPlots = "32cfe2d9-419e-45f2-8191-2267705d8dbc"
 YaoSym = "3b27209a-d3d6-11e9-3c0f-41eb92b2cb9d"
 YaoToEinsum = "9b173c7b-dc24-4dc5-a0e1-adab2f7b6ba9"
 
+[weakdeps]
+CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
+
+[extensions]
+CuYao = "CUDA"
+
 [compat]
 BitBasis = "0.8, 0.9"
 CUDA = "4, 5"