diff --git a/Project.toml b/Project.toml
index b2f9c8f..7b4f9ca 100644
--- a/Project.toml
+++ b/Project.toml
@@ -12,6 +12,7 @@ Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
+NPZ = "0.4"
 julia = "1"
 
 [extras]