diff --git a/test/Project.toml b/test/Project.toml
index 4f12f2015..e536fbfa8 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -36,6 +36,7 @@ Accessors = "0.1"
 Bijectors = "0.13.9, 0.14, 0.15"
 Combinatorics = "1"
 Compat = "4.3.0"
+DifferentiationInterface = "0.6"
 Distributions = "0.25"
 DistributionsAD = "0.6.3"
 Documenter = "1"