diff --git a/Project.toml b/Project.toml
index 060d2e8..13d673d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -19,4 +19,4 @@ GSL = "1, 1.0"
 Parameters = "0.12"
 Reexport = "1, 1.0, 1.1, 1.2"
 SpecialFunctions = "2"
-julia = "1.8, 1.9"
+julia = "1.6,1.7,1.8,1.9"