diff --git a/Project.toml b/Project.toml
index d15e593f4..e333af4c7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -44,6 +44,7 @@ Roots = "2"
 SpecialFunctions = "2"
 StatsBase = "0.33.16"
 Xtals = "0.4"
+julia = "1.7, 1.8"
 
 [extras]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"