diff --git a/Project.toml b/Project.toml
index ea914fad..ef02e11b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -42,7 +42,7 @@ PlotsExt = ["Plots", "RecipesBase"]
 [compat]
 Accessors = "0.1"
 ArnoldiMethod = "0.0.4, 0.1, 0.2, 0.3, 0.4"
-Arpack = "=0.5.3"
+Arpack = "=0.5.3, 0.5"
 BlockArrays = "0.14, 0.15, ^0.16, ^1.0, ^1.1"
 DataStructures = "0.17, 0.18"
 DocStringExtensions = "^0.8, ^0.9"