diff --git a/Project.toml b/Project.toml
index 6f012ab..f03483c 100644
--- a/Project.toml
+++ b/Project.toml
@@ -14,6 +14,7 @@ PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
+ForwardDiff = "0.10"
 julia = "1"
 
 [extras]