diff --git a/Project.toml b/Project.toml
index 836a339..f8abaf3 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,6 +24,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 StructArrays = "09ab397b-f2b6-538f-b94a-2f83cf4a842a"
 
 [compat]
+SeisIO = "1"
 julia = "1"
 
 [extras]