diff --git a/Project.toml b/Project.toml
index c6d5647..30147a8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,3 +11,7 @@ Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
 test = ["Test"]
+
+[compat]
+julia = "1"
+Primes = "^0.4"