diff --git a/Project.toml b/Project.toml
index b885ed0..c54fb28 100644
--- a/Project.toml
+++ b/Project.toml
@@ -25,7 +25,7 @@ ADTypes = "1.14"
 AxisArrays = "0.4"
 DataFrames = "1.6"
 Distributions = "0.25"
-ForwardDiff = "0.10"
+ForwardDiff = "0.10, 1"
 JLD2 = "0.5.13"
 LogExpFunctions = "0.3"
 Logging = "1"