diff --git a/Project.toml b/Project.toml
index 454327fef..a5eba70bc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,7 +17,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
 Aqua = "0.6"
-ArnoldiMethod = "0.1, 0.2"
+ArnoldiMethod = "0.1, 0.2, 0.4"
 Compat = "3.40, 4"
 DataStructures = "0.17, 0.18"
 Documenter = "0.27"