diff --git a/Project.toml b/Project.toml
index 04ff2e4..2dfafb8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -28,6 +28,7 @@ ADTypes = "0.2"
 BenchmarkTools = "1"
 BridgeStan = "2"
 DynamicPPL = "0.23, 0.24"
+ForwardDiff = "0.10.3"
 LogDensityProblems = "2"
 LogDensityProblemsAD = "1"
 PrettyTables = "2"