diff --git a/Project.toml b/Project.toml
index 029331b5..39aee223 100644
--- a/Project.toml
+++ b/Project.toml
@@ -35,7 +35,7 @@ DataFrames = "0.21, 0.22, 1.0"
 DataStructures = "0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18"
 Distributions = "0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25"
 FASTX = "1.1"
-Functors = "0.2"
+Functors = "0.2, 0.3"
 GLM = "1.1, 1.2, 1.3, 1.4"
 NLopt = "0.5.1, 0.6"
 StaticArrays = "0.8.3, 0.9, 0.10, 0.11, 0.12, 1.0"