diff --git a/Project.toml b/Project.toml
index edad6aca1..f7716fbb8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -37,7 +37,7 @@ TOML = "1"
 LinearAlgebra = "1"
 Random = "1"
 SparseArrays = "1"
-julia = "1.6, 1.7, 1.8, 1.9"
+julia = "1.5, 1.6, 1.7, 1.8, 1.9"
 
 [extras]
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"