diff --git a/test/Project.toml b/test/Project.toml
index 8bfc94371..ad909ed3f 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -40,6 +40,7 @@ LogDensityProblems = "2"
 LogDensityProblemsAD = "1"
 MCMCChains = "6.0.4"
 MacroTools = "0.5.5"
+ReverseDiff = "1"
 Setfield = "1"
 StableRNGs = "1"
 Tracker = "0.2.23"