diff --git a/Project.toml b/Project.toml
index d26d2f45..16835015 100644
--- a/Project.toml
+++ b/Project.toml
@@ -52,6 +52,7 @@ LogExpFunctions = "0.3.3"
 MappedArrays = "0.2.2, 0.3, 0.4"
 Reexport = "0.2, 1"
 Requires = "0.5, 1"
+ReverseDiff = "1"
 Roots = "1.3.4, 2"
 Statistics = "1"
 Zygote = "0.6.63"