diff --git a/test/Project.toml b/test/Project.toml
index d5988119a..5590ac169 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -49,6 +49,7 @@ LogDensityProblems = "2"
 MCMCChains = "7.2.1"
 MacroTools = "0.5.6"
 MarginalLogDensities = "0.4"
+Mooncake = "0.4"
 OrderedCollections = "1"
 ReverseDiff = "1"
 SpecialFunctions = "2.6.1"