diff --git a/Project.toml b/Project.toml
index 3c72419..e7d0c0c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -24,6 +24,7 @@ Zarr = "0a941bbe-ad1d-11e8-39d9-ab76183a1d99"
 
 [compat]
 Interpolations = "0.14"
+Optimization = "3"
 StatsBase = "0.34"
 Zarr = "0.9"
 julia = "1"