diff --git a/Project.toml b/Project.toml
index 2dcad1b..26c2db5 100644
--- a/Project.toml
+++ b/Project.toml
@@ -9,6 +9,7 @@ FITSIO = "525bcba6-941b-5504-bd06-fd0dc1a4d2eb"
 WCS = "15f3aee2-9e10-537f-b834-a6fb8bdb944d"
 
 [compat]
+WCS = "0.6"
 julia = "1.6"
 
 [extras]